HR: 13:40h
AN: A22D-01 INVITED     [PDF]
TI: Quantifying biogenic VOC emissions over North America using formaldehyde column observations from space
AU: * Palmer, P I
EM: pip@io.harvard.edu
AF: Harvard University, Division of Engineering and Applied Sciences, Cambridge, MA 02138 United States
AU: Abbot, D S
EM: abbot@fas.harvard.edu
AF: Harvard University, Division of Engineering and Applied Sciences, Cambridge, MA 02138 United States
AU: Fu, T
EM: tmf@io.harvard.edu
AF: Harvard University, Division of Engineering and Applied Sciences, Cambridge, MA 02138 United States
AU: Jacob, D J
EM: djj@io.harvard.edu
AF: Harvard University, Division of Engineering and Applied Sciences, Cambridge, MA 02138 United States
AU: Martin, R V
EM: randall.martin@dal.ca
AF: Dalhousie University, Department of Physics and Atmospheric Science, Halifax, NS B3H 3J5 Canada
AU: Chance, K
EM: kchance@cfa.harvard.edu
AF: Harvard-Smithsonian Center for Astrophysics, Atomic and Molecular Physics Division, Cambridge, MA 02138 United States
AU: Guenther, A
EM: guenther@ucar.edu
AF: National Center for Atmospheric Research, Atmospheric Chemistry Division, Boulder, CO 80307 United States
AB: Formaldehyde (HCHO) columns measured from space using solar UV backscatter allow mapping of reactive hydrocarbon emissions.Our study focuses on North America,where isoprene provides the dominant contribution to HCHO during summer months. Using seven years (1995-2001) of HCHO column data from the GOME satellite instrument we show that the seasonal and interannual variability of HCHO over North America is consistent with known factors that drive regional-scale isoprene emissions. Our previous work has highlighted discrepancies between isoprene emissions derived from GOME and current inventories. These discrepancies are addressed by performing a detailed simulation of oxidant chemistry using the GEOS-CHEM global 3-D model, driven by a new-generation biogenic emission inventory. The contributions from other VOCs, in particular the terpenes, to the GOME HCHO data is also examined. An emission inventory of isoprene calculated from GOME HCHO data is presented with its estimated uncertainties. We evaluate these emissions using in situ measurements of isoprene flux and HCHO concentrations.
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting