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GEOS- Chem during NOMADSS: Near-real-time analyses

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GEOS- Chem during NOMADSS: Near-real-time analyses. Noelle E. Selin, Shaojie Song and Amanda Giang Massachusetts Institute of Technology NOMADSS planning meeting, Boulder CO 16 November 2012 [email protected] http:// mit.edu / selin http:// mit.edu / selingroup. Near-real-time analyses. - PowerPoint PPT Presentation
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GEOS-Chem during NOMADSS: Near- real-time analyses Noelle E. Selin, Shaojie Song and Amanda Giang Massachusetts Institute of Technology NOMADSS planning meeting, Boulder CO 16 November 2012 [email protected] http://mit.edu/selin http://mit.edu/selingroup
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Page 1: GEOS- Chem  during NOMADSS: Near-real-time analyses

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

Page 2: GEOS- Chem  during NOMADSS: Near-real-time analyses

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

Page 3: GEOS- Chem  during NOMADSS: Near-real-time analyses

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)?

Page 4: GEOS- Chem  during NOMADSS: Near-real-time analyses

Resolution of source regions: now able to model at finer scale

Holmes et al., 2010

Zhang et al., 2012

Page 5: GEOS- Chem  during NOMADSS: Near-real-time analyses

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

Page 6: GEOS- Chem  during NOMADSS: Near-real-time analyses

2012 vs 2011 SO2 emissionsOhio

Ohio

Ohio

Page 7: GEOS- Chem  during NOMADSS: Near-real-time analyses

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…

Page 8: GEOS- Chem  during NOMADSS: Near-real-time analyses

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?

Page 9: GEOS- Chem  during NOMADSS: Near-real-time analyses

Comparisons for Hg: MBL

Holmes et al., 2009

Br chemistrySea-salt interactions


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