TOP-DOWN CONSTRAINTS ON EMISSION INVENTORIES OF OZONE PRECURSORS

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Presentation transcript:

TOP-DOWN CONSTRAINTS ON EMISSION INVENTORIES OF OZONE PRECURSORS Daniel Jacob Dorian Abbot Paul Palmer Kelly Chance Thomas Kurosu Randall Martin

HOW DO WE EVALUATE AND IMPROVE BOTTOM-UP INVENTORIES? Surface NOX Global NOx Emissions (Tg N yr-1) Fossil Fuel (20-33) Biomass Burning (3-13) Soils (4-21) Here in Tg N yr-1 (based on) Fossil Fuel 24 (GEIA) Biomass Burning 6 (Logan/Duncan) Soils 5 (Yienger and Levy)

TOP-DOWN INFORMATION FROM THE GOME SATELLITE INSTRUMENT Operational since 1995 Nadir-viewing solar backscatter instrument (237-794 nm) Low-elevation polar sun-synchronous orbit, 10:30 a.m. observation time Spatial resolution 320x40 km2, three cross-track scenes Complete global coverage in 3 days

USE GOME MEASUREMENTS TO RETRIEVE NO2 COLUMNS TO MAP NOx EMISSIONS Retrieval Summary Spectral Fit (423-451 nm) GOME Total Slant Column Remove Stratosphere Tropospheric Slant Column Tropospheric NO2 column ~ ENOx Calculate AMF Tropospheric Column BOUNDARY LAYER Martin et al., 2002 NO2 NO/NO2   W ALTITUDE NO lifetime ~hours HNO3 Emission NITROGEN OXIDES (NOx)

GEOS-CHEM Tropospheric NO2 GOME Tropospheric NO2 GEOS-CHEM Tropospheric NO2 r=0.75 bias 5% Martin et al., 2003 1015 molecules cm-2

STRATEGY: OPTIMIZE SURFACE INVENTORY USING A PRIORI BOTTOM-UP AND GOME TOP-DOWN INFORMATION Top-down emissions A priori emissions A posteriori emissions A priori errors Top-down errors Martin et al., 2003

TOP-DOWN INFORMATION FROM GOME REDUCES ERROR IN NOX EMISSION INVENTORY Bottom-up error a Mean=2.0 Top-down error t Mean=2.0 Mean=1.6 Martin et al., 2003

OPTIMIZED SURFACE NOX EMISSIONS 36.4 Tg N yr-1 37.7 Tg N yr-1 Martin et al., 2003

A POSTERIORI MINUS A PRIORI EMISSIONS Martin et al., 2003

GEOS-CHEM isoprene emissions (in progress using GBEIS) GOME HCHO COLUMNS SHOW SEASONAL VOC EMISSIONS GOME GEOS-CHEM (GEIA) GOME GEOS-CHEM (GEIA) MAR JUL APR AUG MAY SEP JUN OCT -0.5 0 1016 molec cm-2 2.0 2.5 Agreement in general pattern, regional discrepancies point to need for improving GEOS-CHEM isoprene emissions (in progress using GBEIS) Abbot et al., 2003