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Isoprene emissions in Africa inferred from OMI HCHO

Isoprene emissions in Africa inferred from OMI HCHO. Eloïse Marais ( 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. Introduction. OH. C 5 H 8.

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Isoprene emissions in Africa inferred from OMI HCHO

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  1. Isoprene emissions in Africa inferred from OMI HCHO Eloïse Marais (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 OH C5H8 HCHO ISOPOO YHCHO

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

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

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

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

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

  11. Step Four: Remove the influence of smearing Advection OH ISOPOOH HO2 OH or h 100s of kilometers

  12. Quantify HCHO smearing in Africa: Smearing < 100 km in AMMA domain (low isoprene emissions; high NOx) ~200-300 km smearing to the west in central Africa (high isoprene emissions and dominance of low-NOx reaction pathway)

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

  14. Step Five: Estimate isoprene emissions OMI NO2 HCHO yield (S = HCHO/EISOP) vs column NO2 (NO2) from GEOS-Chem HCHO yields [103 s]

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

  16. OMI-derived EISOP MEGAN EISOP OMI– MEGAN 60 Tg C y-1 77 Tg C y-1 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

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