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GOME HCHO JULY 1996 (molec cm-2)

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Presentation on theme: "GOME HCHO JULY 1996 (molec cm-2)"— Presentation transcript:

1 GOME HCHO JULY 1996 (molec cm-2)
Quantifying emissions of natural VOCs using HCHO column observations from space GOME -0.5 0.5 1 1.5 2 2.5 HCHO JULY 1996 (molec cm-2) Biogenic Biomass Burning Paul I. Palmer, Dorian S. Abbot, Tzung-May Fu, Daniel J. Jacob, Randall V. Martin, Kelly Chance, Alex Guenther, Mike Pilling and Jenny Stanton

2 r2 = 0.7 n = 756 Bias = 11% Model:Observed HCHO columns
HCHO columns – July 1996 BIOGENIC ISOPRENE IS THE MAIN SOURCE OF HCHO IN U.S. IN SUMMER [1012 atoms C cm-2 s-1] GEIA isoprene emissions (7.1 Tg C) r2 = 0.7 n = 756 Bias = 11% Model:Observed HCHO columns [1016molec cm-2] GEOS-CHEM HCHO GOME HCHO

3 SEASONAL VARIABILITY IN GOME HCHO COLUMNS (’97)
GEOS-CHEM GOME GEOS-CHEM MAR JUL APR AUG MAY SEP r>0.75 bias~20% JUN OCT 1016 molecules cm-2 2.5

4 Relating HCHO Columns to VOC Emissions
hours OH h, OH kHCHO HCHO EISOP = _______________ kISOPYieldISOPHCHO Master Chemical Mechanism Ultimate Yield Y (per C) Approx. Time to Y isoprene ~0.5 2-3 hrs  pinene ~0.3 3-4 days  pinene ~0.25 MBO ~0.4 VOC source Distance downwind WHCHO Isoprene a-pinene propane 100 km

5 HCHO columns (all biogenics NMHCs) HCHO columns (only monoterpenes)
HCHO column signal from monoterpenes is comparable to GOME column uncertainty (Source of HCHO parameterized from MCM results) HCHO columns (all biogenics NMHCs) HCHO columns (only monoterpenes) [molecules cm-2] GEOS-CHEM

6 Model of Exchanges between the Atmosphere and Nature (MEGAN) Framework
Output Isoprene emission maps (hourly or monthly, 0.25 deg) hourly monthly Total monthly emission activity factor (monthly, 0.25 deg) Landscape average Emission Factor (year 2000, 0.25 deg) Canopy PAR and temperature factor (land surface model) Leaf age emission activity factor LAI emission activity factor Precipitation emission activity factor Time Step: Years Time Step: Hours Time Step: Days Input PAR, temperature, wind and humidity data (hourly, ~2.5 deg) LAI data (monthly, 0.25 deg) precip (monthly, 0.5 deg) Plant Functional Types (year 2000, deg) Emission Factor for each PFT (year 2000, 0.05 deg) C/O Alex Guenther, NCAR

7 Isoprene emissions – July 1996
GEIA BEIS2 MEGAN GOME 7.1 Tg C 2.6 Tg C 3.6 Tg C 5.7 Tg C [1012 atom C cm-2 s-1]

8 GOME isoprene emissions (July 1996) agree with surface measurements
ppb 12 BEIS2 r2 = 0.65 Bias -30% r2 = 0.77 Bias -12% GOME r2 = 0.53 Bias -3% GEIA Modeled HCHO [ppb]

9 ? Isoprene “volcano” GOME GEOS-CHEM [1016 molec cm-2]
Surface temperature [K] Slant column HCHO [1016 mol cm-2] Modeled temperature dependence of isoprene emission July ? July [1016 molec cm-2] mm

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