MAPPING ISOPRENE EMISSIONS FROM SPACE USING OMI FORMALDEHYDE MEASUREMENTS Dylan B. Millet, Daniel J. Jacob, K. Folkert Boersma, Justin P. Parrella Atmospheric.

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Presentation transcript:

MAPPING ISOPRENE EMISSIONS FROM SPACE USING OMI FORMALDEHYDE MEASUREMENTS Dylan B. Millet, Daniel J. Jacob, K. Folkert Boersma, Justin P. Parrella Atmospheric Chemistry Modeling Group, Harvard University Thomas Kurosu and Kelly V. Chance Harvard/Smithsonian Center for Astrophysics Brian G. Heikes (URI), Alan Fried and Alex B. Guenther (NCAR), Colette L. Heald (Berkeley) MAPPING ISOPRENE EMISSIONS FROM SPACE USING OMI FORMALDEHYDE MEASUREMENTS Dylan B. Millet, Daniel J. Jacob, K. Folkert Boersma, Justin P. Parrella Atmospheric Chemistry Modeling Group, Harvard University Thomas Kurosu and Kelly V. Chance Harvard/Smithsonian Center for Astrophysics Brian G. Heikes (URI), Alan Fried and Alex B. Guenther (NCAR), Colette L. Heald (Berkeley) Work supported by NASA/ACMAP

SPACE-BASED MEASUREMENTS OF HCHO COLUMNS OFFER CONSTRAINTS ON VOLATILE ORGANIC COMPOUND (VOC) EMISSIONS VOCHCHO Oxidation (OH, O 3, NO 3 ) several steps h  nm), OH lifetime of hours 340 nm VOCs important as precursors of tropospheric ozone precursors of organic aerosols sinks of OH Vegetation Anthropogenic Biomass burning ~1000 ~200 ~100 Tg C yr -1

RELATING HCHO COLUMNS TO VOC EMISSION VOC i HCHO h (340 nm), OH oxn. k ~ 0.5 h -1 Emission E i smearing, displacement In absence of horizontal wind, mass balance for HCHO column  HCHO : yield y i … but wind smears this local relationship between  HCHO and E i depending on the lifetime of the parent VOC with respect to HCHO production: Local linear relationship between HCHO and E VOC source Distance downwind  HCHO Isoprene  -pinene propane 100 km detection limit

INVERTING HCHO COLUMN DATA FOR ISOPRENE EMISSION GOME slant columns (July 96) GOME vertical columns (July 96) Air Mass Factor E ISOPRENE =(1/S)  HCHO GOME isoprene emission inventory GEOS-Chem chemical transport model GOME/OMI sensitivity HCHO vmr Sigma coordinate validation With HCHO surface air observations with bottom-up isoprene emission inventory with GOME isoprene emission inventory Palmer et al. [2001, 2003, 2006] E ISOPRENE HCHO column non- isoprene contribution slope S Observed HCHO, ppb Model HCHO, ppb

MEGAN EMISSION INVENTORY FOR BIOGENIC VOCs Environmental factors: temperature solar irradiance leaf area index leaf age July 2003

OMI HCHO COLUMNS (Jul-Aug 2005) Thomas Kurosu, Harvard-SAO OMI GOME Pixel resolution13x24 km 2 80x320 km 2 Return time1 day 3 days

OMI vs. GEOS-Chem/MEGAN HCHO COLUMNS Jul-Aug 2005 OMI MEGAN OMI is 35% lower than GEOS-Chem/MEGAN OMI  HCHO, molecules cm -2 GEOS-Chem  HCHO, molecules cm -2 Dylan B. Millet, Harvard detection limit

In contrast, GOME was 10-30% higher than GEOS-Chem/MEGAN! Palmer et al. [2006] Isoprene emission

USING INTEX-A AIRCRAFT DATA AS ARBITER DC km HCHO profiles over N. America (summer 2004) Millet et al. [in press] A. Fried (NCAR) B.G. Heikes (URI) GEOS-Chem model Mean HCHO profiles Observed HCHO columns (NCAR) GEOS-Chem w/GEIA (MEGAN forerunner) R 2 =0.70, bias=+4% (NCAR), +34% (URI) MEGAN is on average 10% lower than GEIA

GEOS-Chem EVALUATION w/ INTEX-B/MILAGRO DATA March 2006 Observed (URI) GEOS-Chem/ MEGAN Observed (NCAR) GEOS-Chem/ MEGAN URI and NCAR measurements now agree and also agree with GEOS-Chem Justin P. Parrella, Harvard

SPATIAL PATTERNS IN OMI vs. MEGAN DISCREPANCIES Scale up OMI to remove overall bias; Drive MEGAN with two different land surface data bases MEGAN w/Olson [2001] data base MEGAN w/ Community Land Model (CLM) NORMALIZED OMI – MEGAN (Jul-Aug 2005) Large sensitivity of MEGAN to choice of land data base! MEGAN higher than normalized OMI in Missouri (Ozarks), lower than OMI in deep South and along southeast Atlantic Dylan B. Millet [Harvard] and Colette L. Heald [Berkeley]

WHY IS MEGAN SO HIGH OVER OZARKS AND VIRIGINIA? Emission factor (EF)CLM land cover Oak tree cover, high temperatures Comparison with OMI suggests that emissions from broadleaf trees are overestimated Dylan B. Millet, Harvard

WHY IS MEGAN LOW IN DEEP SOUTH AND ATL. COAST? CLM land cover suggests underestimate of pine emissions In southeast also suggests underestimate of emissions by cotton and peanuts, the two regional crops Dylan B. Millet, Harvard