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Isoprene emissions in Africa inferred from OMI HCHO Eloïse Marais D. Jacob, T. Kurosu, K. Chance, J. Murphy,

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Presentation on theme: "Isoprene emissions in Africa inferred from OMI HCHO Eloïse Marais D. Jacob, T. Kurosu, K. Chance, J. Murphy,"— Presentation transcript:

1 Isoprene emissions in Africa inferred from OMI HCHO Eloïse Marais (emarais@fas.harvard.edu)emarais@fas.harvard.edu D. Jacob, T. Kurosu, K. Chance, J. Murphy, C. Reeves, G. Mills, S. Casadio, D. Millet, M. Barkley, F. Paulot, J. Mao AMS Conference, Boston 29 May – 1 June 2012

2 Introduction C5H8C5H8 ISOPOO OH HCHO Y HCHO

3 Original OMI slant column HCHO GLC 2000 Landcover

4 Steps One-Three: Filter for Biomass Burning and Anthropogenic Influences

5 Original OMI slant column HCHO 1 MODIS fire counts OMI AAOD thresholds

6 1 Original OMI slant column HCHO OMI HCHO (no biomass burning)

7 1 2 Original OMI slant column HCHO OMI HCHO (no biomass burning) AATSR Algorithm 3 hotspots (2005)

8 1 2 Original OMI slant column HCHO OMI HCHO (no biomass burning) OMI HCHO (biogenic component)

9 1 3 2 Original OMI slant column HCHO OMI HCHO (no biomass burning) OMI HCHO (biogenic component) Air mass factor (AMF) (2005-2009)

10 1 3 2 Original OMI slant column HCHO OMI HCHO (no biomass burning) OMI HCHO (biogenic component) OMI vertical column HCHO (biogenic)

11 Step Four: Remove the influence of smearing 100s of kilometers OH Advection ISOPOOH HO 2 OH or h

12 ~200-300 km smearing to the west in central Africa (high isoprene emissions and dominance of low-NO x reaction pathway) Smearing < 100 km in AMMA domain (low isoprene emissions; high NO x ) Quantify HCHO smearing in Africa:

13 1 4 3 2 Original OMI slant column HCHO OMI HCHO (no biomass burning) OMI HCHO (biogenic component) OMI vertical column HCHO (biogenic) OMI VC HCHO (no smearing)

14 Step Five: Estimate isoprene emissions HCHO yield (S =  HCHO /  E ISOP ) vs column NO 2 (  NO2 ) from GEOS-Chem OMI NO 2 HCHO yields [10 3 s]

15 1 4 3 2 5 Original OMI slant column HCHO OMI HCHO (no biomass burning) OMI HCHO (biogenic component) OMI vertical column HCHO (biogenic) OMI VC HCHO (no smearing) OMI-derived isoprene emissions

16 Future Directions Use the OMI-derived isoprene emissions to understand seasonal and spatial variability of isoprene in Africa Also assess the role of meteorological variables (such as temperature, soil moisture, LAI) on isoprene emissions in Africa OMI-derived E ISOP MEGAN E ISOP OMI– MEGAN 60 Tg C y -1 77 Tg C y -1

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