Mercury: Difference between revisions
| Line 29: | Line 29: | ||
== Diagnostics == | == Diagnostics == | ||
==== Previous discussions | ==== Previous discussions ==== | ||
Here are some suggested changes: | Here are some suggested changes: | ||
Revision as of 14:54, 22 September 2010
Hello Team-Hg
Code
Previous discussions (6/2008)
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)
See v8-03-02 and later for Holmes et al. 2010 Hg+Br simulation.
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
Logicals implemented to select anthropogenic emissions from GEIA 2000, GEIA 2005, or GEIA scaled to Streets et al. 2006 regional totals.
3) Diagnostics. See separate section below.
Diagnostics have been updated.
4) Comment everything in the code. Remove old bits of code that are hanging around & commented out.
Ongoing.
5) GEOS-5
This is the standard meteorology to use at present. MERRA is in development.
6) Get the land stuff out of ocean_mercury_mod.f and into it's own module <- nvd will work on this
Implemented by ccarouge v8-03-02.
Chemistry 'issues'
Previous discussions
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.)
See Holmes et al. 2010 for discussion of chemistry in standard version.
Diagnostics
Previous discussions
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)
To answer Nicole, it is useful to have the large scale and convective wet scavenging written out separately for comparison to wet deposition observations. They are different processes in the model and can tell us different things about where the model is performing well and where it needs improvement (for example, convective scavenging over the Gulf Coast region). (eds)
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