USE OF GEOS-CHEM BY SMITHSONIAN ASTROPHYSICAL OBSERVATORY AND DALHOUSIE UNIVERSITY

Randall Martin

Mid-July

SAO

Halifax, Nova Scotia

RETRIEVAL AND INTERPRETATION OF SATELLITE RETRIEVAL AND INTERPRETATION OF SATELLITE OBSERVATIONS OF THE TROPOSPHEREOBSERVATIONS OF THE TROPOSPHERE

Instrument Coverage Typical resolution

(km)

GOME 1995- 40x320

SCIAMACHY 2002- 30x60

OMI 2004- 13x24

NO2, HCHO, O3, SO2, BrO

GEOS-CHEM MODEL IDENTIFIES FAVORABLE REGIONS TO DETERMINE STRATOSPHERIC COLUMN

AND INSTRUMENT BIASES

Martin et al., 2002

SLANT COLUMNS OF TROPOSPHERIC NOSLANT COLUMNS OF TROPOSPHERIC NO22 FROM GOME FROM GOME

1996

Martin et al., 2002

USE GEOS-CHEM TO CALCULATE AMFs FOR NOUSE GEOS-CHEM TO CALCULATE AMFs FOR NO22 and and

HCHO FOR EVERY SATELLITE VIEWING SCENEHCHO FOR EVERY SATELLITE VIEWING SCENE

SATELLITE DATA

SLANTCOLUMN

GEOS-CHEM GLOBAL 3-D MODEL OF TROPOSPHERIC CHEMISTRY:

provides shape factors

AMF

VERTICALCOLUMN

VERTICALCOLUMN

• Best information applied to each scene• Consistency in comparing model and observed columns

ADVANTAGES OF 3-D MODEL APPROACHFOR COMPUTING AMFs

spectralfit

LIDORT RAD.TRANSFER MODEL:

provides scattering weights

GOME Tropospheric NO2 GEOS-CHEM Tropospheric NO2

1015 molecules cm-2

Martin et al., 2003Martin et al., 2003

OPTIMIZE INVENTORY USING OPTIMIZE INVENTORY USING A PRIORIA PRIORI BOTTOM-UP AND BOTTOM-UP AND GOME TOP-DOWN INFORMATIONGOME TOP-DOWN INFORMATION

Determine NOx Emissions from GOME Observations Using GEOS-CHEM to Provide Information on the NOx/NO2 Ratio and NOx Lifetime

IN THE QUEUE: GEOS-CHEM NOIN THE QUEUE: GEOS-CHEM NOXX EMISSIONS WILL REFLECT EMISSIONS WILL REFLECT

ADDITIONAL GOME INFORMATIONADDITIONAL GOME INFORMATION

Annual mean ratio (A posteriori / A priori)

Martin et al., 2003Martin et al., 2003

EXAMINE SEASONAL VOC EMISSIONS USING GOME AND GEOS-CHEM EXAMINE SEASONAL VOC EMISSIONS USING GOME AND GEOS-CHEM HCHO COLUMNS: HCHO COLUMNS: SAO Role in Retrieval, AMFs, and Model SimulationSAO Role in Retrieval, AMFs, and Model Simulation

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

Abbot et al., 2003Abbot et al., 2003

EL NINO INTERANNUAL VARIABILITY IN OZONE:EL NINO INTERANNUAL VARIABILITY IN OZONE:DIFFERENCE BETWEEN OCT 97 AND OCT 96DIFFERENCE BETWEEN OCT 97 AND OCT 96

Chandra et al. [2002]

TOMS

TOMS/MLS TROPOSPHERIC OZONE PROVIDES FURTHER TOMS/MLS TROPOSPHERIC OZONE PROVIDES FURTHER EVIDENCE THAT OZONE IS TOO HIGH OVER INDIAEVIDENCE THAT OZONE IS TOO HIGH OVER INDIA

Dobson Units for March, April, May

TOMS/MLS

GEOS-CHEM

30 N

30 S

30 N

30 SChandra et al., 2003Chandra et al., 2003

OPERATIONAL HCHO RETRIEVAL ALGORITHM FOR OMIOPERATIONAL HCHO RETRIEVAL ALGORITHM FOR OMI

Uses Monthly Mean HCHO Shape Factors from GEOS-CHEMUses Monthly Mean HCHO Shape Factors from GEOS-CHEM

SUPPORT FOR GMISUPPORT FOR GMI

•Provide GEOS-CHEM resultsProvide GEOS-CHEM results for various simulations (i.e. with and without aerosols)

•Assist interpretation of model results

EVALUATE GEOS-CHEM SIMULATION OF NOEVALUATE GEOS-CHEM SIMULATION OF NOX X

With With In SituIn Situ NO NO22 Measurements from SOS (1999) and TEXAQS (2000) Measurements from SOS (1999) and TEXAQS (2000)

FUTURE USE OF GEOS-CHEM AT DALHOUSIEFUTURE USE OF GEOS-CHEM AT DALHOUSIE

Likely local platforms: Likely local platforms:

8-Processor 1.2 GHz Sun Fire 3800 (Works!, credit Yantosca)8-Processor 1.2 GHz Sun Fire 3800 (Works!, credit Yantosca)

20-Processor 700 MHz SGI Origin 35020-Processor 700 MHz SGI Origin 350

Continued support for GMI Continued support for GMI

Real-time HCHO and NOReal-time HCHO and NO22 Retrievals from SCIAMACHY for INTEX Retrievals from SCIAMACHY for INTEX

Use Shape Factors from GEOS-CHEMUse Shape Factors from GEOS-CHEM

Retrieval and Interpretation of HCHO, NORetrieval and Interpretation of HCHO, NO22, SO, SO22, O, O33, BrO, CO from , BrO, CO from

TOMS / GOME / SCIAMACHY / OMITOMS / GOME / SCIAMACHY / OMI

Interpretation of satellite observations from MOPITT, MODIS, TES, … Interpretation of satellite observations from MOPITT, MODIS, TES, … and aircraft missions such as INTEX, ITCT-2K4, …and aircraft missions such as INTEX, ITCT-2K4, …