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Using satellite observations of HCHO column to better understand natural NMVOC emission processes Paul Palmer, Dorian Abbot, May Fu, Daniel Jacob, Bill.

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Presentation on theme: "Using satellite observations of HCHO column to better understand natural NMVOC emission processes Paul Palmer, Dorian Abbot, May Fu, Daniel Jacob, Bill."— Presentation transcript:

1 Using satellite observations of HCHO column to better understand natural NMVOC emission processes
Paul Palmer, Dorian Abbot, May Fu, Daniel Jacob, Bill Munger, Kelly Chance, Alex Guenther, Mike Pilling, Jenny Stanton, Shelley Pressley, Brian Lamb & Hal Westberg

2 What do we (don’t we) know about biogenic emissions?
What can satellites provide? Global 3d chemistry transport model

3 Modeling Overview GEOS-CHEM Global 3D CTM PAR, T Emissions
MEGAN (isoprene) Canopy model Leaf age LAI Temperature Base factors MODEL BIOSPHERE GEIA Monoterpenes MBO Acetone Methanol Monthly mean AVHRR LAI

4 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]

5 MCM HCHO yield calculations
Isoprene HOURS 0.5 NOx = 1 ppb NOx = 0.1 ppb Used to parameterize (1ST-order decay) HCHO production from monoterpenes in GEOS-CHEM Cumulative HCHO yield [per C]  pinene DAYS 0.4  pinene DAYS

6 Column HCHO Observations of the 2001 North American Growing Season
GEOS-CHEM (MEGAN) GOME GEOS-CHEM (MEGAN) GOME MAY AUG r=0.71 r=0.75 r=0.76 r=0.58 r=0.46 JUN SEP Model bias over southeastern US: May -20% Jun -38% Jul -27% Aug -5% Sep +33% -0.5 2.5 0.5 1.5 JUL [1016 molecules cm-2]

7 [1012 molecules cm-2s-1] [1016 molecules cm-2] -0.5 2.5 0.5 1.5 0.0
(MEGAN) HCHO GOME HCHO MEGAN ISOP MONOTERPENES MAY JUN JUL AUG SEP r=0.71 r=0.75 [1016 molecules cm-2] [1012 molecules cm-2s-1] r=0.76 Biogenic emissions – isoprene, monoterpenes, mbo 10^12 molec emissions flux (mol/cm2/s) 1 - model/obs hcho 2 - model hcho/iso 3 - obs hcho /iso 4 - model hcho/mono 5 - obs hcho/mono MONTH r=0.58 r=0.46 -0.5 2.5 0.5 1.5 0.0 6.0 0.0 1.5

8 Relating HCHO Columns to VOC Emissions
hours OH h, OH kHCHO HCHO EVOC = _______________ kVOCYieldVOCHCHO VOC source Distance downwind WHCHO Isoprene a-pinene propane 100 km

9 Isoprene Emissions during the 2001 Growing Season
MEGAN GOME MAY JUN JUL AUG SEP r = 0.63 Isoprene Emissions during the 2001 Growing Season r = 0.59 r = 0.44 Biogenic emissions – isoprene, monoterpenes, mbo 10^12 molec emissions flux (mol/cm2/s) Correlation( r ) 0.63 0.59 0.44 0.46 0.27 r = 0.46 5 10 [1012 molecules cm-2s-1] r = 0.27

10 PROPHET (MI) DAYS 2K1 MEGAN isop flux (10-12LT)
Measured isop flux (10-12LT) GEOS-CHEM (MEGAN) HCHO column GOME HCHO column PROPHET (MI) C/o Shelley Pressley et al GOME uncertainty Errors from 1) fitting 4x10^15 2) pacific bias correction 1x10^15 3) AMF – albedo, boundary layer depths, clouds and aerosols - 30% + 15% + 30% = 45% in quadrature. Values of monthly mean values range 1e16 – 2.5e16 = 0.8e16 DAYS 2K1

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

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