ESM2.1p1 Meeting (Notes by Lori Sentman)
				Tuesday, 1/15/08
				 10:30 room 217


Frozen TOPAZ for ESM2p1 (John)
------------------------------
1) CO2 flux (sea->atmosphere)
   -plot of 100 yrs shows average of about -10 PgC/yr
   -initial outgassing of 1.6 PgC/yr
   -settles down after about 20 yrs
   -visible 20 year cycle that damps out toward the end

2) Known issues
     
   ---------
  |   ATM   |
   ---------
   ---------
  | sfc ocn |
   ---------
   ---------
  |   deep  | => area of anoxia: no O2; characteristic of ocean BGC models;
  |   ocn   |    determines where N is consumed; may be caused by ocean physics
   ---------     or BGC stochiometry error; denitrification (not good); lot
                 of P; NO3 decreases

          surface
       <----------- 
   CH20 + 02 => CO2 + H2O     (after a chain of reactions forms N2)
        ----------->
           deep 

   NOTE: in anoxia conditions, O2 doesn't exist and is replaced by NO3, SO4,
         Fe3+, CO2

  
   ISSUE: Denitrification in the deep ocean > N2 fixation at the surface

   Budget:   sediment denitrification      -90  TgN/yr
             water column denitrification  -200 TgN/yr
             river input                   +15  TgN/yr
             atmosphere input              +15  TgN/yr
             N2 fixation                   +100 TgN/yr (tweak this to match
             (also fixes OM)                            surface budget)


CaCO3 Preservation in Sediments (John)
--------------------------------------
   
      Source                        Flux (PgC/yr)
      ------                        -------------
 river input                            .1
 euphotic (sunlit) zone export          .4-1.6
 model-f(omega)-gives                   .6
 export to sea floor                    .5-.6
 model-f(omega)-gives                   .43
 burial                                 .1
              
 ~.35 PgC/yr going down after 100 years
 equilibrium value is ~ .1 PgC/yr


LM3V Retuning (Elena)
---------------------
Retuning 286 ppm to behave like 350 ppm -> productivity decreased

Tests run in MLM:
  a) phot CO2 prescribed 286
     -biomass ~700 Gt, aiming for about 900 Gt
     -good growth in conifers and tropical 
     -growth attributed to increasing the leaf lifetime from 1.25 yr to 2 yrs
      which increases thickness and decreases LAI (because they get shorter to
      conserve biomass)                           
  b) CO2 fully interactive
  c) bottom tracer CO2 data override at 286 ppm

Excess initial soil carbon (because not equilibrated) provides additional CO2
to the canopy and creates an artificial CO2 fertilization effect

Amazon has about four 5-6 yr cycles of precip

Need to examine diurnal cycle of CO2 compared with observations

**Issue: Initial excess (1st month of run) of CO2 in the atmosphere of about
  50 ppm; possible code bug to be investigated immediately


NEXT MEETING: Wednesday, 1/30 at 1:30 PM