GEOS- Chem during NOMADSS: Near-real-time analyses
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GEOS-Chem during NOMADSS: Near-real-time analysesNoelle E. Selin, Shaojie Song and Amanda GiangMassachusetts Institute of Technology
NOMADSS planning meeting, Boulder CO16 November 2012
[email protected]://mit.edu/selinhttp://mit.edu/selingroup
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Near-real-time analyses GEOS-Chem simulations at 0.5x0.67
degree nested for North America Hg, CO, potentially full chemistry
simulations Allow us to compare preliminary data
with model results to guide planning decisions
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Previous Hg aircraft model-measurement analyses
Holmes et al., 2010
Roughly uniform concentrations of Hg(0) throughout troposphere, consistent with long lifetime.
Possible surface enhancements in source regions
Hg(II)?
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Resolution of source regions: now able to model at finer scale
Holmes et al., 2010
Zhang et al., 2012
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Comparisons for Hg: Coal-influenced
Strode et al., 2008
CO, other pollution tracers will help us quantify Hg emissions from power plants
How much of a signal will we see given recent emissions decreases?
SO2 control by % of generation, 2011
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2012 vs 2011 SO2 emissionsOhio
Ohio
Ohio
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Speciation of Hg emissions
Wang et al., 2010
FGD changes speciation of mercury at point of emission:
Less Hg(II) relative to Hg(0)
But, in-plume reduction is an ongoing question…
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Comparisons for Hg: Free Trop.
0 50 100 150 200 2500
102030405060708090
100
RH vs RGM (model @ MBO)
rh
We expect to see enhanced Hg(II) in dry, higher-altitude air.
We expect to see enhanced Hg(II) in dry, higher-altitude air.
O3?
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Comparisons for Hg: MBL
Holmes et al., 2009
Br chemistrySea-salt interactions