Changeset 22 for cf-standard-names/trunk/src/cf-standard-name-table.xml
- Timestamp:
- 02/07/07 02:50:36 (2 years ago)
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cf-standard-names/trunk/src/cf-standard-name-table.xml
r21 r22 89 89 <description>Altitude is the (geometric) height above the geoid, which is the reference geopotential surface. The geoid is similar to mean sea level.</description> 90 90 </entry> 91 <entry id="ammonium_ambient_aerosol_optical_depth ">92 <canonical_units>1</canonical_units>93 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown94 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>95 </entry>96 91 <entry id="area_fraction"> 97 92 <canonical_units>1</canonical_units> … … 151 146 <description>The specification of a physical process by the phrase due_to_process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). Atmosphere_Xward_stress is a stress which tends to accelerate the atmosphere in direction X.</description> 152 147 </entry> 153 <entry id="atmosphere_emission_mass_flux_of_anthropogenic_non_methane_volatile_organic_compounds_expressed_as_carbon">154 <canonical_units>kg m-2 s-1</canonical_units>155 <description>In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. "Atmosphere emission" includes emission from sources within the atmosphere itself and at the surface. "Non-methane volatile organic compounds" means a mixture of compounds, the composition of which is not entirely known, but is known not to contain methane. "Expressed as" is used in the construction X_expressed_as_Y to mean the mass of Y contained in X.</description>156 </entry>157 <entry id="atmosphere_emission_mass_flux_of_biogenic_non_methane_volatile_organic_compounds_expressed_as_carbon">158 <canonical_units>kg m-2 s-1</canonical_units>159 <description>In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. "Atmosphere emission" includes emission from sources within the atmosphere itself and at the surface. "Non-methane volatile organic compounds" means a mixture of compounds, the composition of which is not entirely known, but is known not to contain methane. "Expressed as" is used in the construction X_expressed_as_Y to mean the mass of Y contained in X.</description>160 </entry>161 <entry id="atmosphere_emission_mass_flux_of_non_methane_volatile_organic_compounds_expressed_as_carbon">162 <canonical_units>kg m-2 s-1</canonical_units>163 <description>In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. "Atmosphere emission" includes emission from sources within the atmosphere itself and at the surface. "Non-methane volatile organic compounds" means a mixture of compounds, the composition of which is not entirely known, but is known not to contain methane. "Expressed as" is used in the construction X_expressed_as_Y to mean the mass of Y contained in X.</description>164 </entry>165 <entry id="atmosphere_emission_mass_flux_of_nox_expressed_as_nitrogen">166 <canonical_units>kg m-2 s-1</canonical_units>167 <description>In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. "Atmosphere emission" includes emission from sources within the atmosphere itself and at the surface. "Nox" means nitric oxide (NO) and nitrogen dioxide (NO2). "Expressed as" is used in the construction X_expressed_as_Y to mean the mass of Y contained in X.</description>168 </entry>169 148 <entry id="atmosphere_energy_content"> 170 149 <canonical_units>J m-2</canonical_units> … … 205 184 <description>"ln_X" means natural logarithm of X. X must be dimensionless. See Appendix D of the CF convention for information about dimensionless vertical coordinates.</description> 206 185 </entry> 207 <entry id="atmosphere_mass_of_air_per_unit_area">208 <canonical_units>kg m-2</canonical_units>209 <description>"X_area" means the horizontal area occupied by X within the grid cell.</description>210 </entry>211 186 <entry id="atmosphere_mass_per_unit_area"> 212 187 <canonical_units>kg m-2</canonical_units> … … 287 262 <entry id="baseflow_amount"> 288 263 <canonical_units>kg m-2</canonical_units> 289 <description>"Baseflow" is subsurface runoff along aquifersbelow the level of the water table. Runoff is the liquid water which drains from land. "Amount" means mass per unit area.</description>264 <description>"Baseflow" is subsurface runoff which takes place below the level of the water table. Runoff is the liquid water which drains from land. "Amount" means mass per unit area.</description> 290 265 </entry> 291 266 <entry id="bedrock_altitude"> … … 304 279 <canonical_units>kg m-2 s-1</canonical_units> 305 280 <description>"Biomass burning carbon" refers to the rate at which biomass is burned by forest fires etc., expressed as the mass of carbon which it contains. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.</description> 306 </entry>307 <entry id="black_carbon_ambient_aerosol_optical_depth">308 <canonical_units>1</canonical_units>309 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown310 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>311 281 </entry> 312 282 <entry id="brightness_temperature"> … … 331 301 <description>"Amount" means mass per unit area. "Water" means water in all phases, including frozen i.e. ice and snow. "Canopy" means the plant or vegetation canopy. The canopy water is the water on the canopy.</description> 332 302 </entry> 333 <entry id="cell_area">334 <canonical_units>m2</canonical_units>335 <description>The horizontal area of the grid cell.</description>336 </entry>337 <entry id="cell_thickness">338 <canonical_units>m</canonical_units>339 <description>The vertical extent of the grid cell.</description>340 </entry>341 303 <entry id="change_in_atmosphere_energy_content_due_to_change_in_sigma_coordinate_wrt_surface_pressure"> 342 304 <canonical_units>J m-2</canonical_units> … … 355 317 <description>The surface called "surface" means the lower boundary of the atmosphere. "change_over_time_in_X" means change in a quantity X over a time-interval, which should be defined by the bounds of the time coordinate. "Amount" means mass per unit area. Surface amount refers to the amount on the ground, excluding that on the plant or vegetation canopy.</description> 356 318 </entry> 357 <entry id="chemical_destruction_rate_of_mole_concentration_of_carbon_monoxide">358 <canonical_units>mole m-3 s-1</canonical_units>359 <description>"Chemical destruction" means the destruction of a species due to chemical reactions taking place within the atmosphere. It does not360 include deposition from the atmosphere.</description>361 </entry>362 <entry id="chemical_destruction_rate_of_mole_concentration_of_methane">363 <canonical_units>mole m-3 s-1</canonical_units>364 <description>"Chemical destruction" means the destruction of a species due to chemical reactions taking place within the atmosphere. It does not365 include deposition from the atmosphere.</description>366 </entry>367 <entry id="chemical_destruction_rate_of_mole_concentration_of_ozone">368 <canonical_units>mole m-3 s-1</canonical_units>369 <description>"Chemical destruction" means the destruction of a species due to chemical reactions taking place within the atmosphere. It does not370 include deposition from the atmosphere.</description>371 </entry>372 <entry id="chemical_gross_production_rate_of_mole_concentration_of_ozone">373 <canonical_units>mole m-3 s-1</canonical_units>374 <description>"Chemical production" means the production of a species due to chemical reactions taking place within the atmosphere. It does not375 include emission to the atmosphere.</description>376 </entry>377 319 <entry id="cloud_area_fraction"> 378 320 <canonical_units>1</canonical_units> … … 474 416 <description>The Coriolis parameter is twice the component of the earth's angular velocity about the local vertical i.e. 2 W sin L, where L is latitude and W the angular speed of the earth.</description> 475 417 </entry> 476 <entry id="correction_for_model_negative_specific_humid ty">477 <canonical_units>1</canonical_units> 478 <description> Correction added to modelled negative specific humidities to set the value to zero. The modelled value can be recovered by subtracting the correction from the stored value.</description>418 <entry id="correction_for_model_negative_specific_humidity"> 419 <canonical_units>1</canonical_units> 420 <description>A numerical correction which is added to modelled negative specific humidities in order to obtain a value of zero.</description> 479 421 </entry> 480 422 <entry id="depth"> … … 690 632 <canonical_units>s</canonical_units> 691 633 <description>The WMO definition of sunshine is that the surface incident radiative flux from the solar beam (i.e. excluding diffuse skylight) exceeds 120 W m-2. "Duration" is the length of time for which a condition holds.</description> 692 </entry>693 <entry id="dust_ambient_aerosol_optical_depth">694 <canonical_units>1</canonical_units>695 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown696 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>697 634 </entry> 698 635 <entry id="eastward_atmosphere_dry_static_energy_transport_across_unit_distance"> … … 1209 1146 <description>Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of Y to the mass of X (including Y).</description> 1210 1147 </entry> 1211 <entry id="mass_fraction_of_pm1_aerosol_in_air">1212 <canonical_units>1</canonical_units>1213 <description>Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of Y to the mass of X (including Y). "Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). "Pm1 aerosol" is particulate matter with an aerodynamic diameter of up to 0.1 micrometers, sometimes referred to as the "ultrafine particle fraction".</description>1214 </entry>1215 <entry id="mass_fraction_of_pm10_aerosol_in_air">1216 <canonical_units>1</canonical_units>1217 <description>Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of Y to the mass of X (including Y)."Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). "Pm10 aerosol" is particulate matter with an aerodynamic diameter of up to 10 micrometers.</description>1218 </entry>1219 <entry id="mass_fraction_of_pm2p5_aerosol_in_air">1220 <canonical_units>1</canonical_units>1221 <description>Mass fraction is used in the construction mass_fraction_of_X_in_Y, where X is a material constituent of Y. It means the ratio of the mass of Y to the mass of X (including Y). "Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). "Pm2p5 aerosol" is particulate matter with an aerodynamic diameter of up to 2.5 micrometers.</description>1222 </entry>1223 1148 <entry id="mass_fraction_of_precipitation_in_air"> 1224 1149 <canonical_units>1</canonical_units> … … 1280 1205 <description>"moisture" means water in all phases contained in soil. "Content" indicates a quantity per unit area. "Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. Quantities defined for a soil layer must have a vertical coordinate variable with boundaries indicating the extent of the layer(s). The field capacity of soil is the maximum content of water it can retain against gravitational drainage.</description> 1281 1206 </entry> 1282 <entry id="mole_fraction_of_alpha_hexachlorocyclohexane_in_air">1283 <canonical_units>1</canonical_units>1284 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1285 </entry>1286 <entry id="mole_fraction_of_anthropogenic_non_methane_volatile_organic_compounds_in_air">1287 <canonical_units>1</canonical_units>1288 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1289 </entry>1290 <entry id="mole_fraction_of_biogenic_non_methane_volatile_organic_compounds_in_air">1291 <canonical_units>1</canonical_units>1292 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1293 </entry>1294 <entry id="mole_fraction_of_carbon_monoxide_in_air">1295 <canonical_units>1</canonical_units>1296 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1297 </entry>1298 <entry id="mole_fraction_of_divalent_mercury_in_air">1299 <canonical_units>1</canonical_units>1300 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1301 </entry>1302 <entry id="mole_fraction_of_hexachlorbiphenyl_in_air">1303 <canonical_units>1</canonical_units>1304 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1305 </entry>1306 <entry id="mole_fraction_of_hydroxyl_radical_in_air">1307 <canonical_units>1</canonical_units>1308 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1309 </entry>1310 <entry id="mole_fraction_of_mercury_in_air">1311 <canonical_units>1</canonical_units>1312 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1313 </entry>1314 <entry id="mole_fraction_of_nitrogen_acid_in_air">1315 <canonical_units>1</canonical_units>1316 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1317 </entry>1318 <entry id="mole_fraction_of_nitrogen_dioxide_in_air">1319 <canonical_units>1</canonical_units>1320 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1321 </entry>1322 <entry id="mole_fraction_of_nitrogen_monoxide_in_air">1323 <canonical_units>1</canonical_units>1324 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1325 </entry>1326 1207 <entry id="mole_fraction_of_ozone_in_air"> 1327 1208 <canonical_units>1</canonical_units> 1328 1209 <amip>tro3</amip> 1329 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1330 </entry>1331 <entry id="mole_fraction_of_peroxyacetyl_nitrate_in_air">1332 <canonical_units>1</canonical_units>1333 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description>1334 </entry>1335 <entry id="mole_fraction_of_sulfur_dioxide_in_air">1336 <canonical_units>1</canonical_units>1337 1210 <description>Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y.</description> 1338 1211 </entry> … … 1414 1287 <description>A phrase assuming_condition indicates that the named quantity is the value which would obtain if all aspects of the system were unaltered except for the assumption of the circumstances specified by the condition. "shortwave" means shortwave radiation. "Upward" indicates a vector component which is positive when directed upward (negative downward). Net upward radiation is the difference between radiation from below (upwelling) and radiation from above (downwelling). In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.</description> 1415 1288 </entry> 1416 <entry id="nitrate_ambient_aerosol_optical_depth">1417 <canonical_units>1</canonical_units>1418 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown1419 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>1420 </entry>1421 1289 <entry id="normalized_difference_vegetation_index"> 1422 1290 <canonical_units>1</canonical_units> 1423 <description>"Normalized_difference_vegetation_index", usually abbreviated to NDVI, is an index calculated from reflectances measured in the visible and near infrared channels. It is calculated as NDVI = (NIR - R) / (NIR + R) where NIR is the reflectance in the near-infrared band and R is the reflectance in the red visible band. Reflectance is the ratio of the reflected over the incoming radiation in each spectral band. The calculated value of NDVI depends on the precise definition of the spectral bands andmay vary between different models and remote sensing instruments.</description>1291 <description>"Normalized_difference_vegetation_index", usually abbreviated to NDVI, is an index calculated from reflectances measured in the visible and near infrared channels. It is calculated as NDVI = (NIR - R) / (NIR + R) where NIR is the reflectance in the near-infrared band and R is the reflectance in the red visible band. Reflectance is the ratio of the reflected over the incoming radiation in each spectral band. The calculated value of NDVI depends on the precise definitions of the spectral bands and these definitions may vary between different models and remote sensing instruments.</description> 1424 1292 </entry> 1425 1293 <entry id="northward_atmosphere_dry_static_energy_transport_across_unit_distance"> … … 1610 1478 <description>The specification of a physical process by the phrase due_to_process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Layer" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. The optical thickness is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path. "Aerosol" means the suspended liquid or solid particles in air (except cloud droplets).</description> 1611 1479 </entry> 1612 <entry id="organic_carbon_ambient_aerosol_optical_depth">1613 <canonical_units>1</canonical_units>1614 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown1615 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>1616 </entry>1617 1480 <entry id="planetary_albedo"> 1618 1481 <canonical_units>1</canonical_units> … … 1666 1529 <canonical_units>degree s-1</canonical_units> 1667 1530 <description>Standard names for platform describe the motion and orientation of the vehicle from which observations are made e.g. aeroplane or ship.</description> 1668 </entry>1669 <entry id="pm1_ambient_aerosol_optical_depth">1670 <canonical_units>1</canonical_units>1671 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown1672 hygroscopically under ambient relative humidity conditions. "Pm1 aerosol" is particulate matter with an aerodynamic diameter of up to 0.1 micrometers, sometimes referred to as the "ultrafine particle fraction". "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>1673 </entry>1674 <entry id="pm10_ambient_aerosol_optical_depth">1675 <canonical_units>1</canonical_units>1676 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown1677 hygroscopically under ambient relative humidity conditions. "Pm10 aerosol" is particulate matter with an aerodynamic diameter of up to 10 micrometers. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>1678 </entry>1679 <entry id="pm2p5_ambient_aerosol_optical_depth">1680 <canonical_units>1</canonical_units>1681 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown1682 hygroscopically under ambient relative humidity conditions. "Pm2p5 aerosol" is particulate matter with an aerodynamic diameter of up to 2.5 micrometers. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>1683 1531 </entry> 1684 1532 <entry id="potential_energy_content_of_atmosphere_layer"> … … 1872 1720 <description>"Amount" means mass per unit area. Runoff is the liquid water which drains from land. If not specified, "runoff" refers to the sum of surface runoff and subsurface drainage.</description> 1873 1721 </entry> 1874 <entry id="runoff_ excluding_baseflow">1875 <canonical_units>kg m-2</canonical_units> 1876 <description>Runoff is the liquid water which drains from land. "Runoff_excluding_baseflow" is the sum of surface runoff and subsurface runoff excluding baseflow. Baseflow is subsurface runoff along aquifers below the level of the water table.</description>1722 <entry id="runoff_amount_excluding_baseflow"> 1723 <canonical_units>kg m-2</canonical_units> 1724 <description>Runoff is the liquid water which drains from land. "Runoff_excluding_baseflow" is the sum of surface runoff and subsurface runoff excluding baseflow. Baseflow is subsurface runoff which takes place below the level of the water table. "Amount" means mass per unit area.</description> 1877 1725 </entry> 1878 1726 <entry id="runoff_flux"> … … 1969 1817 <entry id="sea_surface_height_above_reference_ellipsoid"> 1970 1818 <canonical_units>m</canonical_units> 1971 <description> A reference ellipsoid is a mathematical figure that approximates the geoid. The match is not exact because the geoid is an irregular shape. A number of reference ellipsoids have been defined for use in the field of geodesy. "Sea surface height" is a time-varying quantity. The standard name for the height of the sea surface above the geoid is sea_surface_height_above_geoid. The standard name for the height of the sea surface above mean sea level is sea_surface_height_above_sea_level.</description>1819 <description>"Sea surface height" is a time-varying quantity. A reference ellipsoid is a mathematical figure that approximates the geoid. The geoid is a surface of constant geopotential with which mean sea level would coincide if the ocean were at rest. The ellipsoid is an approximation because the geoid is an irregular shape. A number of reference ellipsoids are defined for use in the field of geodesy. The standard name for the height of the sea surface above the geoid is sea_surface_height_above_geoid. The standard name for the height of the sea surface above mean sea level is sea_surface_height_above_sea_level.</description> 1972 1820 </entry> 1973 1821 <entry id="sea_surface_height_above_sea_level"> … … 2104 1952 <description>A velocity is a vector quantity. "y" indicates a vector component along the grid y-axis, when this is not true latitude, positive with increasing y.</description> 2105 1953 </entry> 2106 <entry id="seasalt_ambient_aerosol_optical_depth">2107 <canonical_units>1</canonical_units>2108 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown2109 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>2110 </entry>2111 1954 <entry id="snow_density"> 2112 1955 <canonical_units>kg m-3</canonical_units> … … 2315 2158 <description>Runoff is the liquid water which drains from land. If not specified, "runoff" refers to the sum of surface runoff and subsurface drainage. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.</description> 2316 2159 </entry> 2317 <entry id="sulfate_ambient_aerosol_optical_depth">2318 <canonical_units>1</canonical_units>2319 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown2320 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>2321 </entry>2322 2160 <entry id="surface_air_pressure"> 2323 2161 <canonical_units>Pa</canonical_units> … … 2518 2356 <description>The surface called "surface" means the lower boundary of the atmosphere.</description> 2519 2357 </entry> 2520 <entry id="surface_dry_deposition_mass_flux_of_all_nitrogen_oxides_expressed_as_nitrogen">2521 <canonical_units> kg m-2 s-1</canonical_units>2522 <description>"Dry deposition" includes gravitational settling, impact scavenging and turbulent deposition. "All nitrogen oxides" is the sum of all simulated oxidized nitrogen species, including NO, NO2, HNO3, HNO4, NO3 aerosol, the NO3 radical, N2O5, peroxyacetyl nitrate (PAN) and other organic nitrates. "Expressed as" is used in the construction X_expressed_as_Y to mean the mass of Y contained in X.</description>2523 </entry>2524 2358 <entry id="surface_eastward_geostrophic_sea_water_velocity"> 2525 2359 <canonical_units>m s-1</canonical_units> 2526 <description>The surface called "surface" means the lower boundary of the atmosphere. "Water" means water in all phases, including frozen i.e. ice and snow. A velocity is a vector quantity. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). "Geostrophic" indicates that geostrophic balance is assumed. surface_eastward_sea_water_geostrophic_velocity is the sum of a variable part, surface_eastward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid, and a constant part due to the stationary component of ocean circulation.</description>2360 <description>The surface called "surface" means the lower boundary of the atmosphere. A velocity is a vector quantity. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). "Geostrophic" indicates that geostrophic balance is assumed. "Water" means water in all phases. surface_eastward_sea_water_geostrophic_velocity is the sum of a variable part, surface_eastward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid, and a constant part due to the stationary component of ocean circulation.</description> 2527 2361 </entry> 2528 2362 <entry id="surface_eastward_geostrophic_sea_water_velocity_assuming_sea_level_for_geoid"> 2529 2363 <canonical_units>m s-1</canonical_units> 2530 <description>The surface called "surface" means the lower boundary of the atmosphere. "Water" means water in all phases, including frozen i.e. ice and snow. A velocity is a vector quantity. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). "Geostrophic" indicates that geostrophic balance is assumed. The geoid is a surface of constant geopotential. surface_eastward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid is the variable part of surface_northward_sea_water_geostrophic_velocity. "sea_level" means mean sea level, and is assumed to be equal to the geoid sothat the stationary component of ocean circulation is equal to zero.</description>2364 <description>The surface called "surface" means the lower boundary of the atmosphere. A velocity is a vector quantity. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). "Geostrophic" indicates that geostrophic balance is assumed. "Water" means water in all phases. "sea_level" means mean sea level. The geoid is a surface of constant geopotential with which mean sea level would coincide if the ocean were at rest. surface_eastward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid is the variable part of surface_eastward_sea_water_geostrophic_velocity. The assumption that sea level is equal to the geoid means that the stationary component of ocean circulation is equal to zero.</description> 2531 2365 </entry> 2532 2366 <entry id="surface_eastward_sea_water_velocity"> … … 2578 2412 <entry id="surface_northward_geostrophic_sea_water_velocity"> 2579 2413 <canonical_units>m s-1</canonical_units> 2580 <description>The surface called "surface" means the lower boundary of the atmosphere. "Water" means water in all phases, including frozen i.e. ice and snow. A velocity is a vector quantity. "Northward" indicates a vector component which is positive when directed northward (negative southward). "Geostrophic" indicates that geostrophic balance is assumed. surface_northward_sea_water_geostrophic_velocity is the sum of a variable part surface_northward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid and ofa constant part due to the stationary component of ocean circulation.</description>2414 <description>The surface called "surface" means the lower boundary of the atmosphere. A velocity is a vector quantity. "Northward" indicates a vector component which is positive when directed northward (negative southward). "Geostrophic" indicates that geostrophic balance is assumed. "Water" means water in all phases. surface_northward_sea_water_geostrophic_velocity is the sum of a variable part, surface_northward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid, and a constant part due to the stationary component of ocean circulation.</description> 2581 2415 </entry> 2582 2416 <entry id="surface_northward_geostrophic_sea_water_velocity_assuming_sea_level_for_geoid"> 2583 2417 <canonical_units>m s-1</canonical_units> 2584 <description>The surface called "surface" means the lower boundary of the atmosphere. "Water" means water in all phases, including frozen i.e. ice and snow. A velocity is a vector quantity. "Northward" indicates a vector component which is positive when directed northward (negative southward). "Geostrophic" indicates that geostrophic balance is assumed. The geoid is a surface of constant geopotential. surface_northward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid is the variable part of surface_northward_sea_water_geostrophic_velocity. "sea_level" means mean sea level, and is assumed to be equal to the geoid sothat the stationary component of ocean circulation is equal to zero.</description>2418 <description>The surface called "surface" means the lower boundary of the atmosphere. A velocity is a vector quantity. "Northward" indicates a vector component which is positive when directed northward (negative southward). "Geostrophic" indicates that geostrophic balance is assumed. "Water" means water in all phases. "sea_level" means mean sea level. The geoid is a surface of constant geopotential with which mean sea level would coincide if the ocean were at rest. surface_northward_sea_water_geostrophic_velocity_assuming_sea_level_for_geoid is the variable part of surface_northward_sea_water_geostrophic_velocity. The assumption that sea level is equal to the geoid means that the stationary component of ocean circulation is equal to zero.</description> 2585 2419 </entry> 2586 2420 <entry id="surface_northward_sea_water_velocity"> … … 2783 2617 <description>The surface called "surface" means the lower boundary of the atmosphere. "Amount" means mass per unit area. "Water" means water in all phases, including frozen i.e. ice and snow. Surface amount refers to the amount on the ground, excluding that on the plant or vegetation canopy.</description> 2784 2618 </entry> 2785 <entry id="surface_wet_deposition_mass_flux_of_all_nitrogen_oxides_expressed_as_nitrogen">2786 <canonical_units>kg m-2 s-1</canonical_units>2787 <description>In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics."Wet deposition" means deposition by precipitation. "All nitrogen oxides" is the sum of all simulated oxidized nitrogen species, including NO, NO2, HNO3, HNO4, NO3 aerosol, the NO3 radical, N2O5, peroxyacetyl nitrate (PAN) and other organic nitrates. "Expressed as" is used in the construction X_expressed_as_Y to mean the mass of Y contained in X.</description>2788 </entry>2789 2619 <entry id="temperature_of_sensor_for_oxygen_in_sea_water"> 2790 2620 <canonical_units>K</canonical_units> … … 3396 3226 <entry id="volume_fraction_of_water_in_soil_at_critical_point"> 3397 3227 <canonical_units>1</canonical_units> 3398 <description>" Critical point" refers to soil moisture content and is one of the factors that determine the rate of evapotranspiration. Evapotranspiration is the sum of evaporation and plant transpiration. When soil moisture equals or exceeds the critical point evapotranspiration takes place at the potential rate and is controlled by the ambient meteorological conditions (temperature, wind, relative humidity). Potential evapotranspiration is the rate at which evapotranspiration would occur under ambient conditions from a uniformly vegetated area when the water supply is not limiting. When soil moisture is between the critical point and the wilting point the rate of evapotranspiration decreases with decreasing soil moisture.</description>3228 <description>"Water" means water in all phases. "Volume fraction" is used in the construction volume_fraction_of_X_in_Y, where X is a material constituent of Y. When soil moisture equals or exceeds the critical point evapotranspiration takes place at the potential rate and is controlled by the ambient meteorological conditions (temperature, wind, relative humidity). Evapotranspiration is the sum of evaporation and plant transpiration. Potential evapotranspiration is the rate at which evapotranspiration would occur under ambient conditions from a uniformly vegetated area when the water supply is not limiting.</description> 3399 3229 </entry> 3400 3230 <entry id="volume_fraction_of_water_in_soil_at_field_capacity"> … … 3465 3295 <canonical_units>kg m-2 s-1</canonical_units> 3466 3296 <description>"Water" means water in all phases. The water flux or volume transport into the ocean from rivers is the inflow to the ocean, often applied to the surface in ocean models. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.</description> 3467 </entry>3468 <entry id="water_in_ambient_aerosol_optical_depth">3469 <canonical_units>1</canonical_units>3470 <description>"Aerosol" means the suspended liquid or solid particles in air (except cloud droplets). Ambient aerosol is aerosol that has grown3471 hygroscopically under ambient relative humidity conditions. "Optical depth", also known as "optical thickness", is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path.</description>3472 3297 </entry> 3473 3298 <entry id="water_potential_evaporation_amount">
