Mercury: Difference between revisions
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== GTMM == | == GTMM == | ||
See the Global Terrestrial Mercury Model wiki page: http://wiki.seas.harvard.edu/geos-chem/index.php/Global_Terrestrial_Mercury_Model | See the Global Terrestrial Mercury Model wiki page: http://wiki.seas.harvard.edu/geos-chem/index.php/Global_Terrestrial_Mercury_Model | ||
User manual: http://www.geos-chem.org/doc/man/files/GTMM_manual_20100811.pdf | |||
Revision as of 14:33, 22 September 2010
Hello Team-Hg
Code
Here's the list of things I *think* we came up with on Friday regarding cleaning up the code (feel free to add/comment)
1) Standardize the solver. Everyone should use the solver Chris developed for the Hg chemistry
(located at ~cdh/GC/RevisedChem.v7-04-06/mercury_mod.f)
- outstanding issue - dry dep of Hg0* <- currently working on this (eds)
2) Catalog all emissions options and develop clear flagging system to choose your own adventure. This will include:
- different anthropogenic emissions scenarios/corrections (i.e Jaffe vs. Streets) <- going to work on the anthro emissions soon (eds),
- different land emissions. <- nvd will work on this
3) Diagnostics. See separate section below.
4) Comment everything in the code. Remove old bits of code that are hanging around & commented out.
5) GEOS-5
6) Get the land stuff out of ocean_mercury_mod.f and into it's own module <- nvd will work on this
Chemistry 'issues'
1) Oxidant. Chris has a simulation with Hg-Br chemistry and SS aerosol deposition; the global budget is ok, but the Br concentrations in the BL are too low to generate diurnal cycles. (cdh working on it)
2) Snow/ice scavenging of HgII
3) Dry deposition of "aqueous HgII. (Explanation from Chris: We calculate the fraction of HgII, Fg, which is gas phase. But we're currently applying the dry deposition velocity to both gas and aqueous fractions. I think it would be better to deposit the aqueous fraction at the velocity of HgP; this would be slower dep, but I don't know how much. This is definitely up for discussion.)
Diagnostics
Here are some suggested changes:
- Emissions should have units 'kg/m2/s' or something of the form 'mass/area/time' (they are currently 'kg'). The HG-SRCE diagnostic currently has all of the Ocean tracers and fluxes; these should go elsewhere.
- The Ocean Hg0, Hg2, HgC should have concentration units not kg. Is 'molar' the best choice? Fluxes of these should be in concentration/time, not kg.
- The ocean restart files should have concentration units not kg. They currently use the category 'OCEAN-HG' which would make sense for the ND03 ocean Hg0, Hg2, HgC output too.
- 'PL-HG2-$' doesn't really describe all of the fluxes in our model. There are a lot of diagnostic quantities which are either chemical P/L fluxes or rate constants. I think these should all be in one diagnostic called something like 'PL-HG-$' (or maybe 'PL-HG-A', 'PL-HG-O' to separate the atmosphere and ocean). The fluxes in this diagnostic would include redox in air and water, colloidal sinking, ocean-atmosphere piston velocity, ...
Here are the current GEOS-Chem Hg outputs
CATEGORY ILUN TRCNAME TRC UNIT TAU0(DATE) DIMENSIONS 1 : IJ-AVG-$ 23 Hg0 1 pptv 157776.00(2003010100) 72 46 30 2 : IJ-AVG-$ 23 Hg2 2 pptv 157776.00(2003010100) 72 46 30 3 : IJ-AVG-$ 23 HgP 3 pptv 157776.00(2003010100) 72 46 30 4 : WETDCV-$ 23 Hg2 3002 kg/s 157776.00(2003010100) 72 46 30 5 : WETDCV-$ 23 HgP 3003 kg/s 157776.00(2003010100) 72 46 30 6 : WETDLS-$ 23 Hg2 3002 kg/s 157776.00(2003010100) 72 46 30 7 : WETDLS-$ 23 HgP 3003 kg/s 157776.00(2003010100) 72 46 30 8 : HG-SRCE 23 Hg0_an 34001 kg 157776.00(2003010100) 72 46 1 9 : HG-SRCE 23 Hg0_aq 34002 kg 157776.00(2003010100) 72 46 1 10 : HG-SRCE 23 Hg0_oc 34003 kg 157776.00(2003010100) 72 46 1 11 : HG-SRCE 23 Hg0_ln 34004 kg 157776.00(2003010100) 72 46 1 12 : HG-SRCE 23 Hg0_na 34005 kg 157776.00(2003010100) 72 46 1 13 : HG-SRCE 23 Hg2_an 34006 kg 157776.00(2003010100) 72 46 1 14 : HG-SRCE 23 Hg2_aq 34007 kg 157776.00(2003010100) 72 46 1 15 : HG-SRCE 23 Hg2_sk 34008 kg 157776.00(2003010100) 72 46 1 16 : HG-SRCE 23 HgP_an 34009 kg 157776.00(2003010100) 72 46 1 17 : HG-SRCE 23 KwHg 34010 cm/h 157776.00(2003010100) 72 46 1 18 : HG-SRCE 23 HgC 34011 kg 157776.00(2003010100) 72 46 1 19 : HG-SRCE 23 Hg_to_C 34012 kg 157776.00(2003010100) 72 46 1 20 : PL-HG2-$ 23 Hg2_Hg0 35001 kg 157776.00(2003010100) 72 46 30 21 : PL-HG2-$ 23 Hg2_OH 35002 kg 157776.00(2003010100) 72 46 30 22 : PL-HG2-$ 23 Hg2_O3 35003 kg 157776.00(2003010100) 72 46 30 23 : PL-HG2-$ 23 Hg2_SS 35004 kg 157776.00(2003010100) 72 46 1 24 : PL-HG2-$ 23 Hg2_SSR 35005 /s 157776.00(2003010100) 72 46 1 25 : DRYD-FLX 23 Hg0df 36001 molec/cm2/s 157776.00(2003010100) 72 46 1 26 : DRYD-FLX 23 Hg2df 36002 molec/cm2/s 157776.00(2003010100) 72 46 1 27 : DRYD-FLX 23 HgPdf 36003 molec/cm2/s 157776.00(2003010100) 72 46 1 28 : DRYD-VEL 23 Hg2dv 37002 cm/s 157776.00(2003010100) 72 46 1 29 : DRYD-VEL 23 HgPdv 37003 cm/s 157776.00(2003010100) 72 46 1
I think we should change lines 8-24 (I've kept the same line numbers and TRCNAME, but changed CATEGORY, TRC, or UNIT):
CATEGORY TRCNAME TRC UNIT 8 : HG-SRCE Hg0_an 34001 kg/m2/s 10 : HG-SRCE Hg0_oc 34002 kg/m2/s 11 : HG-SRCE Hg0_ln 34003 kg/m2/s 12 : HG-SRCE Hg0_na 34004 kg/m2/s 13 : HG-SRCE Hg2_an 34005 kg/m2/s 16 : HG-SRCE HgP_an 34006 kg/m2/s 9 : OCEAN-HG Hg0_aq xxxx1 mol/L 14 : OCEAN-HG Hg2_aq xxxx2 mol/L 18 : OCEAN-HG HgC xxxx3 mol/L 20 : PL-HG-A Hg2_Hg0 35001 kg/m3/s 21 : PL-HG-A Hg2_OH 35002 kg/m3/s 22 : PL-HG-A Hg2_O3 35003 kg/m3/s 23 : PL-HG-A Hg2_SS 35004 kg/m3/s 24 : PL-HG-A Hg2_SSR 35005 /s 15 : PL-HG-O Hg2_sk xxxx1 kg/m3/s 19 : PL-HG-O Hg_to_C xxxx2 kg/m3/s 17 : PL-HG-O KwHg xxxx3 cm/h
The only thing I have to add is that at first I didn't realize that wet deposition of Hg(II) was composed of both WETDCV and WETDLS. Is it important to save those components out as 2 separate parts? (nvd)
GTMM
See the Global Terrestrial Mercury Model wiki page: http://wiki.seas.harvard.edu/geos-chem/index.php/Global_Terrestrial_Mercury_Model User manual: http://www.geos-chem.org/doc/man/files/GTMM_manual_20100811.pdf