Difference between revisions of "Mean OH concentration"
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− | | GEOS-FP | + | | GEOS-FP 2013 |
− | | <tt> | + | | <tt>12.689</tt> |
− | | <tt> | + | | <tt>0.300 (2.421%)</tt> |
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*[[GEOS-FP|Global simulations with GEOS-FP data product from GMAO]] | *[[GEOS-FP|Global simulations with GEOS-FP data product from GMAO]] | ||
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+ | | [[GEOS-Chem_v9-02_benchmark_history#v9-02r-geosfp-Run0|v9-02r-geosfp-Run0]] | ||
+ | | GEOS-FP 2013 | ||
+ | | <tt>12.3891</tt> | ||
+ | | <tt>-0.537 (-4.154%)</tt> | ||
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+ | *[[GEOS-FP|Global simulations with GEOS-FP data product from GMAO]] | ||
+ | </div> | ||
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+ | *[[GEOS-Chem v9-02|v9-02 page]] | ||
+ | *[[GEOS-FP]] page | ||
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Revision as of 18:27, 17 January 2014
On this page we track the evolution of the mean OH concentration in GEOS-Chem. This value is an indicator of how "hot" the chemistry is. Please also see the related topic about the methyl chloroform lifetime in GEOS-Chem.
Contents
Computation of the mean OH diagnostic
The mean OH diagnostic in GEOS-Chem is computed in diag_pl_mod.f.
Routine DO_DIAG_OH sums up the tropospheric air mass and mass-weighted OH mass after each call to the chemistry solver. The summing happens in these lines of code:
! Sum air mass term into AIR_MASS array XAIRMASS = AIRDENS(JLOOP) * VOLUME(JLOOP) AIR_MASS(I,J,L) = AIR_MASS(I,J,L) + XAIRMASS ! Sum OH mass term into OH_MASS array XOHMASS = CSPEC(JLOOP,IDOH) * XAIRMASS OH_MASS(I,J,L) = OH_MASS(I,J,L) + XOHMASS
where the arrays contain the following quantities:
JLOOP = 1-D array index for SMVGEAR I,J,L = 3-D array indices AIRDENS(JLOOP) = air density [molec/cm3] VOLUME(JLOOP) = grid box volume [cm3] AIR_MASS(I,J,L) = air mass [molec air] CSPEC(JLOOP,IDOH) = OH concentration [molec OH/cm3] OH_MASS(I,J,L) = mass-weighted OH = OH mass * air mass [molec OH/cm3 * molec air]
After the GEOS-Chem simulation finishes, the mean OH value is printed out in subroutines PRINT_MEAN_OH:
! Total Mass-weighted OH [molec OH/cm3] * [molec air] SUM_OHMASS = SUM( OH_MASS ) ! Atmospheric air mass [molec air] SUM_MASS = SUM( AIR_MASS ) ! Divide OH [molec OH/cm3 * molec air] by [molec air] and report as [1e5 molec/cm3] OHCONC = ( SUM_OHMASS / SUM_MASS ) / 1d5 ! Write value to log file WRITE( 6, '(/,a)' ) REPEAT( '=', 79 ) WRITE( 6, * ) 'ND23: Mass-Weighted OH Concentration' WRITE( 6, * ) 'Mean OH = ', OHCONC, ' [1e5 molec/cm3]' WRITE( 6, '( a)' ) REPEAT( '=', 79 )
Typical values vary between 105 - 115 molec/cm3.
--Bob Y. 15:12, 11 February 2010 (EST)
Evolution of mean OH in GEOS-Chem
Plot of mean OH evolution
Here is a plot of the mean OH concentration from several recent GEOS–Chem 1-year benchmark simulations. The mean OH is an indicator how the chemistry mechanism is performing. Typical values are 10–12 x 105 molecules cm-1.
--Bob Y. 12:41, 17 January 2014 (EST)
Table of mean OH values
The following table chronicles the evolution of the mean OH value from several different GEOS-Chem simulations. All benchmark simulations were conducted at 4 x 5 resolution unless noted otherwise.
Benchmark | Met Fields & Year | Mean OH [105 molec cm-3] |
Change from previous version [105 molec cm-3] |
Important updates in this benchmark simulation | References |
---|---|---|---|---|---|
GEOS-Chem version 9 | |||||
v9-02r-geosfp-Run1 | GEOS-FP 2013 | 12.689 | 0.300 (2.421%) |
| |
v9-02r-geosfp-Run0 | GEOS-FP 2013 | 12.3891 | -0.537 (-4.154%) |
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v9-02r-geos5-Run0 | GEOS-5.1.0 2005 | 12.926 | 0.356 (2.832%) |
| |
v9-02l-Run0 | GEOS-5.1.0 2005 | 12.570 | 0.332 (2.713%) |
|
|
v9-02j-Run0 | GEOS-5.1.0 2005 | 12.238 | -0.234 (-1.876%) |
| |
v9-02g-Run0 | GEOS-5.1.0 2005 | 12.472 | 0.969 (8.424%) |
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v9-02f-Run0 | GEOS-5.1.0 2005 | 11.503 | 0.089 (0.692%) |
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v9-02b-Run0 | GEOS-5.1.0 2005 | 11.424 | 0.068 (0.599%) |
| |
v9-01-03r-Run1 | GEOS-5.1.0 2005 | 11.356 | -0.502 (-4.233%) |
||
v9-01-03r-Run0 | GEOS-5.1.0 2005 | 11.858 | -0.077 (-0.645%) |
| |
v9-01-03e-Run0 | GEOS-5.1.0 2005 | 11.935 | -0.397 (-3.219%) |
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v9-01-02-Run1 | GEOS-5.1.0 2005 | 12.332 | +0.099 (+0.809%) |
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v9-01-02-Run0 | GEOS-5.1.0 2005 | 12.233 | -0.009 (-0.074%) |
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v9-01-01-Run1 | GEOS-5.1.0 2005 | 12.242 | +0.377 (+3.177%) |
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v9-01-01-Run0 | GEOS-5.1.0 2005 | 11.865 | +0.798 (+7.2%) |
| |
GEOS-Chem version 8 | |||||
v8-02-04-Run2 | GEOS-5.1.0 2005 | 11.067 | +0.019 (+0.17%) |
|
|
v8-02-04-Run1 | GEOS-5.1.0 2005 | 11.048 | +0.598 (+5.72%) |
|
|
v8-02-04-Run0 | GEOS-5.1.0 2005 | 10.450 | -1.362 (-11.53%) |
|
|
v8-02-01-Run0 | GEOS-5.1.0 2005 | 11.812 | +0.713 (+6.42%) |
|
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v8-01-04-Run2 | GEOS-5.1.0 2005 | 11.099 | +0.805 (+7.82%) |
|
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v8-01-04-Run1 | GEOS-5.0.1 2005 | 10.294 | -0.395 (-3.69%) |
|
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v8-01-04-Run0 | GEOS-5.0.1 2005 | 10.689 | -1.351 (-11.22%) |
||
v8-01-01-Run1 | GEOS-5.0.1 2005 | 12.040 | +0.034 (+0.28%) |
|
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v8-01-01-Run0 | GEOS-5.0.1 2005 | 12.006 | -0.141 (-1.16%) |
|
|
GEOS-Chem version 7 | |||||
v7-04-13-Run | GEOS-4 2005 | 12.147 | -0.669 (-5.22%) |
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v7-04-12-Run2 | GEOS-4 2005 | 12.816 | +1.053 (+8.95%) |
|
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v7-04-12-Run1 | GEOS-4 2005 | 11.763 | -0.68 (-5.5%) |
|
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v7-04-02-MEGAN | GEOS-4 2001 | 12.44 | -0.11 (-0.87%) |
|
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v7-04-02-NOMEGAN | GEOS-4 2001 | 12.55 | +0.01 (+0.08%) |
|
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v7-04-02-Base | GEOS-4 2001 | 12.54 | +0.67 (+5.6%) |
|
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v7-02-03-Run1 | GEOS-4 2001 | 11.87 | +1.39 (+13.26%) |
|
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v7-02-03-Run0 | GEOS-3 2001 | 10.48 | --- |
|
--Bob Y. 12:13, 3 October 2013 (EDT) --Melissa Sulprizio 18:11, 20 November 2013 (EST)
Additional documentation
GEOS-Chem version 8
- Differences in isoprene between v8-02-04-Run1 and v8-02-04-Run0
- Differences between MODIS LAI and AVHRR LAI
GEOS-Chem version 7
- Rynda Hudman investigated the changes in CO and O3 among benchmark simulations from v7-02-03 thru v7-04-12.
- List of differences in benchmark simulations between v7-02-03 and v7-04-02.
- List of differences in benchmark simulations between v7-04-02 and v7-04-12.
- Changes in anthropogenic NOx and CO from 1-yr benchmarks with versions v7-02-03 and v7-02-04
- Jennifer Logan looked at some of the differences between GEOS-3 and GEOS-4 in 1-year benchmark simulations.
--Bob Y. 09:32, 23 February 2010 (EST)