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Summary
This is a CloudSat-collocated subset of the original product OMSO2, for the purposes of the A-Train mission. The goal of the subset is to select and return OMI data that are within +-100 km across the CloudSat track. I.e. the resultant OMI subset swath is sought to be about 200 km cross-track of CloudSat. Even though collocated with CloudSat, this subset can serve many other A-Train ... applications.

A list of tools for browsing and extracting data from these files can
be found at: http://daac.gsfc.nasa.gov/Aura/tools.shtml .

For more information on Ozone Monitoring Instrument and
atmospheric data products, please visit the OMI-Aura sites:
http://aura.gsfc.nasa.gov/instruments/omi/
http://disc.gsfc.nasa.gov/Aura/OMI/omso2_v003.shtml

Original full-sized OMI Atmospheric Data can be ordered from the following sites:
http://mirador.gsfc.nasa.gov/
https://wist.echo.nasa.gov/


Aura OMI level-2 SO2 data product OMSO2 has been made available to
public since April 20, 2006 from NASA Goddard Space Flight Center
(GSFC) Distributed Active Archive Center (DAAC) which is part of the
Goddard Earth Sciences Data and Information Services Center (GES DISC)
http://disc.gsfc.nasa.gov/ .

The Ozone Monitoring Instrument (OMI)was launched aboard the EOS-Aura
satellite on July 15, 2004(1:38 pm equator crossing time, ascending
mode). OMI with its 2600 km viewing swath width provides almost daily
global coverage. OMI is a contribution of the Netherlands Agency for
Aerospace Programs (NIVR)in collaboration with Finish Meterological
Institute (FMI), to the US EOS-Aura Mission. OMI is designed to
monitor stratospheric and tropospheric ozone, clouds, aerosols and
smoke from biomass burning, SO2 from volcanic eruptions, and key
tropospheric pollutants (HCHO, NO2) and ozone depleting gases (OClO
and BrO).

OMI sensor counts, calibrated and geolocated radiances, and all
derived geophysical atmospheric products will be archived at the NASA
Goddard DAAC.

This document describes the original OMI SO2 product (OMSO2) produced from global mode UV measurements of the Ozone Monitoring Instrument (OMI). OMI was launched on July 15, 2004 on the EOS Aura satellite, which is in a sun-synchronous ascending polar orbit with 1:45pm local equator crossing time. The data collection started on August 17, 2004 (orbit 482) and continues to this day with only minor data gaps. The minimum SO2 mass detectable by OMI is about two orders of magnitude smaller than the detection threshold of the legacy Total Ozone Mapping Spectrometer (TOMS) SO2 data (1978-2005) [Krueger et al 1995: http://toms.umbc.edu ]. This is due to smaller OMI footprint and the use of wavelengths better optimized for separating O3 from SO2.

The product file, called a data granule, covers the sunlit portion of the orbit with an approximately 2600 km wide swath containing 60 pixels per viewing line. During normal operations, 14 or 15 granules are produced daily, providing fully contiguous coverage of the globe. Currently, OMSO2 products are not produced when OMI goes into the “zoom mode” for one day every 452 orbits (~32 days). For each OMI pixel we provide 4 different estimates of the column density of SO2 in Dobson Units (1DU=2.69 ∙1016 molecules/cm2) obtained by making different assumptions about the vertical distribution of the SO2. However, it is important to note that in most cases the precise vertical distribution of SO2 is unimportant. The users can use either the SO2 plume height, or the center of mass altitude (CMA) derived from SO2 vertical distribution, to interpolate between the 4 values:

1)Planetary Boundary Layer (PBL) SO2 column (ColumnAmountSO2_PBL), corresponding to CMA of 0.9 km.
2)Lower tropospheric SO2 column (ColumnAmountSO2_TRL), corresponding to CMA of 2.5 km.
3)Middle tropospheric SO2 column, (ColumnAmountSO2_TRM), usually produced by volcanic degassing, corresponding to CMA of 7.5 km,
4)Upper tropospheric and Stratospheric SO2 column (ColumnAmountSO2_STL), usually produced by explosive volcanic eruption, corresponding to CMA of 17 km.

The accuracy and precision of the derived SO2 columns vary significantly with the SO2 CMA and column amount, observational geometry, and slant column ozone. OMI becomes more sensitive to SO2 above clouds and snow/ice, and less sensitive to SO2 below clouds. Preliminary error estimates are discussed below (see Data Quality Assessment). Details about software versions and known issues are available in the OMSO2ReleaseDetails file (http://so2.umbc.edu/omi/ click on Documentation).

OMSO2 files are stored in EOS Hierarchical Data Format
(HDF-EOS5). Each file contains data from the day lit portion of an
orbit (53 minutes). There are approximately 14 orbits per day. The
maximum file size for the OMSO2 data product is about 9 Mbytes.

A list of tools for browsing and extracting data from these files can
be found at: http://daac.gsfc.nasa.gov/Aura/tools.shtml .

A short OMSO2 Readme Document that includes brief algorithm
description and data quality is also provided by the OMSO2 Algorithm
lead. For more information on Ozone Monitoring Instrument and
atmospheric data products, please visit the OMI-Aura sites:
http://aura.gsfc.nasa.gov/instruments/omi/
http://www.knmi.nl/omi/research/documents/
http://so2.umbc.edu/omi/omi_docs


Subset OMI-CloudSat collocated Atmospheric Data (OMSO2_CPR) can be searched and downloaded using Mirador:
http://mirador.gsfc.nasa.gov/

Geographic Coverage Spatial coordinates   

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Data Set Citation

Dataset Creator: Arlin Krueger Ph.D. Dataset Title: OMI/Aura Level 2 Sulphur Dioxide (SO2) Trace Gas Column Data 1-Orbit subset Swath along CloudSat track 1-Orbit Swath 13x24 km Dataset Series Name: OMSO2_CPR Dataset Release Date: April 20, 2006 Dataset Release Place: NASA Goddard Space Flight Center Version: 003 Data Presentation Form: Digital Science Data Online Resource: http://disc.sci.gsfc.nasa.gov/Aura/OMI/omso2_v003.shtml

Temporal Coverage

Start Date: 2004-08-17

Location Keywords

GEOGRAPHIC REGION > GLOBAL

Data Resolution

Latitude Resolution: 13km Longitude Resolution: 24 km Horizontal Resolution Range: 10 km - < 50 km or approximately .09 degree - < .5 degree Temporal Resolution: Day Time Orbit

Science Keywords

ATMOSPHERE > ATMOSPHERIC CHEMISTRY > SULFUR COMPOUNDS > SULFUR DIOXIDE ATMOSPHERE > ATMOSPHERIC CHEMISTRY > TRACE GASES/TRACE SPECIES HUMAN DIMENSIONS > ENVIRONMENTAL IMPACTS > BIOMASS BURNING HUMAN DIMENSIONS > ENVIRONMENTAL IMPACTS > INDUSTRIAL EMISSIONS HUMAN DIMENSIONS > HUMAN HEALTH > PUBLIC HEALTH ATMOSPHERE > AIR QUALITY > SULFUR OXIDES ATMOSPHERE > ATMOSPHERIC CHEMISTRY > SULFUR COMPOUNDS > SULFUR OXIDES

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Platform

AURA > Aura

Instrument

OMI > Ozone Monitoring Instrument

Project

AURA > Earth Observing System (EOS), AURA EOSDIS > Earth Observing System Data Information System ESIP > Earth Science Information Partners Program

Quality
The 'version 003' product is the second public release. The quality of
this v003 product is based on preliminary calibration algorithm and
this product is not fully validated yet. Please see the detailed
Quality assessment ... documenet provided by Algorithm Lead, April 20,
2006. Though overall quality of Column SO2 parameters are satisfactory,
users are strongly advised to consult the OMI Quality Assurance Team
for most recent information on our ongoing assessment of OMSO2 data
quality.

For release details please see:
http://so2.umbc.edu/omi/Documentation/OMSO2ReleaseDetails_v111_0303...

Ancillary Keywords

Atmospheric Chemistry Total Column Sulfer Dioxide (SO2) Air Quality Pollutant EOSDIS

Data Set Progress

IN WORK

Data Center

Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA Data Center URL: http://disc.gsfc.nasa.gov/ Dataset ID: OMSO2_CPR Data Center Personnel Name: GES DISC HELP DESK SUPPORT GROUP Phone: 301-614-5224 Fax: 301-614-5268 Email: help-disc at listserv.gsfc.nasa.gov Contact Address: Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA Atmospheric Composition Data Center, Goddard Earth Sciences Data and Information Services Center, Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA Data Center URL: http://disc.sci.gsfc.nasa.gov/acdisc/ Data Center Personnel Name: ACDISC USER SUPPORT OFFICE Phone: 301-614-5224 Fax: 301-614-5268 Email: help-disc at listserv.gsfc.nasa.gov Contact Address: Goddard Earth Sciences Data and Information Services Center Code 610.2 NASA Goddard Space Flight Center City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA

Distribution

Distribution Media: FTP Distribution Size: Approx 9 MB per file Distribution Format: HDF-EOS5 Fees: None

Personnel

NIKOLAY KROTKOV, PH. D Role: INVESTIGATOR Phone: 301-614-5553 Fax: 301-614-5903 Email: nickolay.a.krotkov at nasa.gov Contact Address: NASA GEST/UMBC Goddard Space Flight Center Mailstop 613.3 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA ARLIN J. KRUEGER, PH. D Role: INVESTIGATOR Phone: 410-455-8906 Fax: 410-455-5868 Email: akrueger at umbc.edu Contact Address: NASA Joint Center for Earth System Technology University of Maryland, Baltimore County 1000 Hilltop Circle City: Baltimore Province or State: MD Postal Code: 21250 Country: USA SURAIYA P. AHMAD, PH. D Role: TECHNICAL CONTACT Phone: 301-614-5284 Email: Suraiya.Ahmad at nasa.gov Contact Address: NASA Goddard Space Flight Center Code 610.2 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA SURAIYA P. AHMAD, PH. D Role: DIF AUTHOR Phone: 301-614-5284 Email: Suraiya.Ahmad at nasa.gov Contact Address: NASA Goddard Space Flight Center Code 610.2 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA

Related URL

Link: GET DATA > MIRADOR Description: Fast Access to subset OMS02 data through GES-DISC Mirador Link: GET DATA > GIOVANNI Link: GET DATA > GIOVANNI Description: Web based On-line Visualization and Analysis Tool (Giovanni)for OMI-CloudSat and other A-Train subset Products Link: GET SERVICE > GET SOFTWARE PACKAGE Description: Read Software and Visualization Tools Link: VIEW RELATED INFORMATION Description: OMI group at Koninklijk Nederlands Meteorologisch Instituut Link: VIEW RELATED INFORMATION Description: OMI SO2 group at UMBC

Publications/References
Ahmad, S. P., P. F. Levelt, P. K. Bhartia, E. Hilsenrath, G. W.
Leppelmeier,and J. E. Johnson, &Atmospheric Products from the
Ozone Monitoring Instrument(OMI)&, Proceedings of SPIE
conference on Earth Observing Systems VIII, San Diego,
California, Aug 3-8, 2003.
... http://disc.sci.gsfc.nasa.gov/acdisc/ozone/docs/omi-spie-2003.doc

Brinksma, E. J., K. F. Boersma, and P. F. Levelt, OMI-Validation
Requirements, May 16, 2003.

Bogumil, K., J. Orphal, T. Homann, S. Voigt, P. Spietz, O.C. Fleischmann, A.
Vogel, M. Hartmann, H. Kromminga, H. Bovensmann, J. Frerick, J.P. Burrows,
Measurements of molecular absorption spectra with the SCIAMACHY pre-flight
model: instrument characterization and reference data for atmospheric
remote-sensing in the 230-2380nm region, Journal of Photochemistry and
Photobiology, A:Chemistry, 157 , 167-184, 2003.

Krotkov, N.A., S.A. Carn, A.J. Krueger, P.K. Bhartia, and K. Yang (2005). Band
residual difference algorithm for retrieval of SO2 from the Aura Ozone
Monitoring Instrument (OMI). IEEE Trans.Geosci. Remote Sensing, AURA special
issue, 44(5), 1259-1266, doi:10.1109/TGRS.2005.861932, 2006

Krueger,A. J., N. A. Krotkov, S. Datta, D. Flittner, and O. Dubovik, ?SO2?, in
Algorithm Theoretical Baseline Document: OMI Trace Gas Algorithms, K. Chance
(ed.), vol. IV, ATBD-OMI-04, version 2.0, Aug. 2002.

Krueger, A.J., L.S. Walter, P.K. Bhartia, C.C. Schnetzler, N.A. Krotkov, I.
Sprod, and G.J.S. Bluth(1995). Volcanic sulfur dioxide measurements from the
total ozone mapping spectrometer instruments. J. Geophys. Res., 100(D7),
14057-14076, 10.1029/95JD01222.

Levelt, P.F., G.H.J. van den Oord, M.R. Dobber, A. Malkki, H. Visser, J. de
Vries, P. Stammes, J. Lundell and H. Saari, The Ozone Monitoring Instrument,
IEEE Trans. Geo. Rem. Sens., 2006, Vol. 44, No. 5, 1093-1101,
doi:10.1109/TGRS.2006.872333.

Levelt, P.F., E. Hilsenrath, G.W. Leppelmeier, G.H.J. van den Oord, P.K.
Bhartia, J. Tamminen, J.F. de Haan en J.P. Veefkind, Science Objectives of the
Ozone Monitoring Instrument, IEEE Trans. Geo. Rem. Sens., 2006, Vol. 44, No. 5,
1199-1208, doi:10.1109/TGRS.2006.872336.

Levelt, P.F., J. P. Veefkind, R. H. M. Voors, and J. de Vries, &Instrument
Description&, Algorithm Theoretical Baseline Document: OMI Instrument, Level 0
- 1B processor, Calibration & Operations, P. F. Levelt (ed.), vol. I,
ATBD-OMI-01, version 2, Aug. 2002.
http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/atbd/docs/O...

Schoeberl, M.R., A.R. Douglass, E. Hilsenrath, P.K. Bhartia, R. Beer, J.W.
Waters, M.R. Gunson, L. Froidevaux, J.C. Gille, J.J. Barnett, P.F. Levelt and
P. DeCola, Overview of the EOS aura mission, IEEE Trans. Geo. Rem. Sens., 2006,
Vol. 44, No. 5, 1066-1074, doi:10.1109/TGRS.2005.861950.

Creation and Review Dates

DIF Creation Date: 2008-07-11 Last DIF Revision Date: 2009-01-28

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