Difference between revisions of "Mean OH concentration"
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+ | !Benchmark | ||
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+ | !Mean OH<br>[10<sup>5</sup> molec cm<sup>-3</sup>] | ||
+ | !Change from<br>previous version<br>[10<sup>5</sup> molec cm<sup>-3</sup>] | ||
+ | !Important updates in this benchmark simulation | ||
+ | !References | ||
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+ | === Mean OH in GEOS-Chem v9 === | ||
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+ | !Benchmark | ||
+ | !Met Fields & Year | ||
+ | !Mean OH<br>[10<sup>5</sup> molec cm<sup>-3</sup>] | ||
+ | !Change from<br>previous version<br>[10<sup>5</sup> molec cm<sup>-3</sup>] | ||
+ | !Important updates in this benchmark simulation | ||
+ | !References | ||
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+ | === Mean OH in GEOS-Chem v8 === | ||
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+ | !Benchmark | ||
+ | !Met Fields & Year | ||
+ | !Mean OH<br>[10<sup>5</sup> molec cm<sup>-3</sup>] | ||
+ | !Change from<br>previous version<br>[10<sup>5</sup> molec cm<sup>-3</sup>] | ||
+ | !Important updates in this benchmark simulation | ||
+ | !References | ||
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− | ! | + | !Benchmark |
− | ! | + | !Met Fields & Year |
− | ! | + | !Mean OH<br>[10<sup>5</sup> molec cm<sup>-3</sup>] |
+ | !Change from<br>previous version<br>[10<sup>5</sup> molec cm<sup>-3</sup>] | ||
+ | !Important updates in this benchmark simulation | ||
+ | !References | ||
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Revision as of 15:21, 29 March 2018
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.
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.
Mean OH in GEOS-Chem v10
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 |
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v10-01i-Run0 | GEOS-FP 2013 | 11.125 | 0.033 (0.298%) |
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v10-01h-Run0 | GEOS-FP 2013 | 11.092 | -0.751 (-6.341%) |
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v10-01e-Run1 | GEOS-FP 2013 | 11.843 | -0.042 (-0.353%) |
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v10-01c-Run1 | GEOS-FP 2013 | 11.885 | -0.665 (-5.299%) |
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v10-01c-Run0 | GEOS-FP 2013 | 12.550 | -0.139 (-1.095%) |
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Mean OH in GEOS-Chem v9
Mean OH in GEOS-Chem v8
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 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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GEOS-Chem version 8 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
v8-02-04-Run2 | GEOS-5.1.0 2005 | 11.067 | +0.019 (+0.17%) |
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v8-02-04-Run1 | GEOS-5.1.0 2005 | 11.048 | +0.598 (+5.72%) |
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v8-02-04-Run0 | GEOS-5.1.0 2005 | 10.450 | -1.362 (-11.53%) |
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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%) |
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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%) |
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Mean OH in GEOS-Chem v7
--Bob Y. 12:13, 3 October 2013 (EDT) Additional documentationGEOS-Chem version 8
GEOS-Chem version 7
--Bob Y. 09:32, 23 February 2010 (EST) |