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Isoprene emissions in Africa inferred from OMI HCHO. Eloïse Marais ( [email protected] ) 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. - PowerPoint PPT Presentation
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Isoprene emissions in Africa inferred from OMI HCHO
Eloïse Marais ([email protected])D. Jacob, T. Kurosu, K. Chance, J. Murphy, C. Reeves, G. Mills, S. Casadio, D. Millet, M. Barkley, F. Paulot, J. Mao
AMS Conference, Boston29 May – 1 June 2012
Introduction
C5H8 ISOPOOOH HCHO
YHCHO
Original OMI slant column HCHO GLC 2000 Landcover
Steps One-Three:Filter for Biomass Burning and Anthropogenic Influences
Original OMI slant column HCHO
1
MODIS fire counts OMI AAOD thresholds
1
Original OMI slant column HCHO
OMI HCHO (no biomass burning)
1 2
Original OMI slant column HCHO
OMI HCHO (no biomass burning)
AATSR Algorithm 3 hotspots (2005)
1 2
Original OMI slant column HCHO
OMI HCHO (no biomass burning)
OMI HCHO (biogenic component)
1
3
2
Original OMI slant column HCHO
OMI HCHO (no biomass burning)
OMI HCHO (biogenic component)
Air mass factor (AMF) (2005-2009)
1
3
2
Original OMI slant column HCHO
OMI HCHO (no biomass burning)
OMI HCHO (biogenic component)
OMI vertical column HCHO (biogenic)
Step Four:Remove the influence of smearing
100s of kilometers
OHAdvectionISOPOOH HO2OH or h
~200-300 km smearing to the west in central Africa
(high isoprene emissions and dominance of low-NOx reaction pathway)
Smearing < 100 km in AMMA domain
(low isoprene emissions; high NOx)
Quantify HCHO smearing in Africa:
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)
Step Five:Estimate isoprene emissions
HCHO yield (S = HCHO/EISOP) vs column NO2 (NO2) from GEOS-Chem
OMI NO2
HCHO yields[103 s]
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
Future DirectionsUse 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 EISOP MEGAN EISOP OMI– MEGAN
60 Tg C y-1 77 Tg C y-1