North american isoprene emissions measured from space
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North American Isoprene Emissions Measured from Space. Paul Palmer Harvard University. ACD seminar series, NCAR, January 14, 2002. Talk Overview. Relating HCHO columns to VOC emissions Global 3d model analysis GOME HCHO columns Are different HCHO data consistent? •

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North American Isoprene Emissions Measured from Space

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North american isoprene emissions measured from space

North American Isoprene Emissions Measured from Space

Paul Palmer

Harvard University

ACD seminar series, NCAR, January 14, 2002


Talk overview

Talk Overview

  • Relating HCHO columns to VOC emissions

  • Global 3d model analysis

  • GOME HCHO columns

  • Are different HCHO data consistent? •

  • GOME isoprene emissions


Overall approach

Overall Approach


Talk overview1

Talk Overview

  • Relate HCHO columns to VOC emissions

  • Global 3d model analysis

  • HCHO from GOME

  • Are different HCHO data consistent?

  • GOME isoprene emissions


Vocs hcho and tropospheric o 3

VOCs, HCHO and tropospheric O3

VOC

VOC + OH ... ... n HCHO + OTHER PRODUCTS

HCHO + h 2HO2 + CO

H2 + CO

HCHO + OH HO2 + CO + H2O


Geia isoprene

GEIAisoprene

EPA BEIS2 isoprene


Summertime in situ hcho datasets

Summertime in situ HCHO datasets

Fried et al 1997

Harris et al 1989

Kleindienst et al 1988

Lee et al 1995, 1998

Martin et al 1991

McKeen et al 1997

OZIE - Guenther

Reimer et al 1998

Shepson et al 1991

ppb


Relating hcho columns to voc emissions

Relating HCHO columns to VOC emissions

kHCHO

  • Absence of transport  = Yi Ei

i

VOCi

Emission Ei

kHCHO


Hcho yields from vocs

HCHO yields from VOCs

Total:

86%


Horizontal transport displaces and smears hcho signal

  • VOC YiHCHO

  • Define a displacement length scale

  • andsmearing length scale

Horizontal transport displaces and smears HCHO signal

ki


Limiting values l s i u k i when k i k hcho l s i u k hcho when k hcho k i

Limiting values:Ls,i U/kiwhen ki«kHCHOLs,i U/kHCHOwhen kHCHO«ki

midmorning eg values

KHCHO = 0.5h-1; U = 20kmh-1; [OH]=5E6 mol cm-3

ISOP Ld,i & Ls,i 40 km

CH4Ld,i & Ls,i = many 1000s km

CH3OH Ld,i =250 km; Ls,i = 1000 km

~ GOME obs


Geos chem global 3d model 101

GEOS-CHEM global 3D model: 101

  • Driven by GEOS met data

  • 2x2.5o resolution/26 vertical levels

  • O3-NOx-VOC chemistry

  • GEIA isoprene emissions

  • Aerosol scattering: AOD:O3

Dickerson et al, [1997]


Geos chem hcho columns july 1996

GEOS-CHEM HCHO columnsJuly 1996

GEIA isoprene emissions

[1016 molec cm-2]


North american isoprene emissions measured from space

July 1996 (25-50oN, 65-130oW)

NW

NE

Slope S = Y/kHCHO

Model HCHO column [1016 molec cm-2]

SW

SE

Isoprene emission [1013 atomC cm-2 s-1]


North american isoprene emissions measured from space

Yields consistent with photochemical model


Global ozone monitoring experiment

Global Ozone Monitoring Experiment

  • Nadir-viewing SBUV instrument

  • Launched April 1995

  • Pixel 320 x 40 km2

  • 10.30 am cross-equator time

  • Global coverage in 3 days

  • O3, NO2, BrO, OClO, SO2, HCHO, H2O, & cloud coverage


Hcho slant column fitting

HCHO slant column fitting

Chance et al [2000]

  • O3

  • NO2

  • BrO

  • O2-O2

3 x 1016 molec cm-2

8 x 1016 molec cm-2

1fitting uncertainty4 x 1015 molec cm-2


Vertical column slant column amf

vertical column = slant column /AMF

Palmer et al, [2001]


Amf example tennessee

AMF example - Tennessee

S() w()

AMF

0.71

AMFG

2.08

w()

GEOS-CHEM S()

AMF calculation every GOME July 1996 scene...


Gome hcho july 1996

GOME HCHO – July 1996

Filtered for cloudy scenes (cf > 40%)

Chance et al, 2000; Palmer et al, 2001


Gome hcho july 19961

GOME HCHO – July 1996

r2 = 0.7 n = 756

GOME

GEOS-CHEM

Bias = 11%


Gome hcho t vs isop t

GOME HCHO(T) vs ISOP(T)

300.5

Ozarks

ISOP(T) [Guenther et al, 1995]


Overall approach1

Overall Approach


North american isoprene emissions measured from space

GEIA

EPA BEIS2


Summertime in situ hcho datasets1

Summertime in situ HCHO datasets

Fried et al 1997

Harris et al 1989

Kleindienst et al 1988

Lee et al 1995, 1998

Martin et al 1991

McKeen et al 1997

OZIE -Guenther

Reimer et al 1998

Shepson et al 1991

ppb


Modeling in situ data

Modeling in situ data

GEIA

BEIS2

r2 = 0.65

Bias -30%

r2 = 0.53

Bias -3%


Model transfer functions

Model Transfer functions

NW

NE

Model HCHO column [1016 molec cm-2]

SW

SE

Isoprene emission [1013 atomC cm-2 s-1]


Gome isoprene emissions

GOME isoprene emissions


Beis2 fine structure

BEIS2 fine structure


Consistency gome and in situ data

Consistency: GOME and in situ data

r2 = 0.77

Bias -12%


Summary

Summary

  • New methodology for VOC emission from space-based HCHO columns

  • Isoprene is dominant VOC for North American summertime

  • GOME shows Ozarks isoprene volcano

  • EPA BEIS2 too low?

  • GOME consistent with in situ data

  • Daily VOC emissions: the future?


Acknowledgements

Acknowledgements

  • Daniel Jacob, Arlene Fiore, Randall Martin (Harvard University)

  • Kelly Chance, Thomas Kurosu (Harvard-Smithsonian Observatory)


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