HR: 10:35h
AN: A51H-02    [PDF]
TI: Estimating Global Nitrous Oxide Surface Fluxes Using a Time-Dependent Bayesian Inversion Technique
AU: * Hirsch, A
EM: Adam.Hirsch@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, 216 UCB, Boulder, CO 80309-0216 United States
AU: * Hirsch, A
EM: Adam.Hirsch@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, Mailcode R/CMDL-1, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Bruhwiler, L
EM: Lori.Bruhwiler@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, Mailcode R/CMDL-1, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Michalak, A
EM: Anna.Michalak@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, Mailcode R/CMDL-1, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Peters, W
EM: Wouter.Peters@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, Mailcode R/CMDL-1, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Miller, J
EM: John.B.Miller@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, 216 UCB, Boulder, CO 80309-0216 United States
AU: Miller, J
EM: John.B.Miller@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, Mailcode R/CMDL-1, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Tans, P
EM: Pieter.Tans@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, Mailcode R/CMDL-1, 325 Broadway, Boulder, CO 80305-3328 United States
AB: The continual increase of nitrous oxide in the atmosphere, combined with its strong greenhouse warming and stratospheric ozone-depleting properties, make improved understanding of the atmospheric nitrous oxide budget an important scientific goal. During the period 1998 to 2002, nitrous oxide measurements from the NOAA/CMDL global flask network showed significant inter-annual variability in both the global atmospheric growth rate and the latitudinal gradient at the surface. Additionally, measurements from stations located in high northern and southern latitudes exhibited seasonal cycles with amplitudes exceeding 0.3 ppbv. To explore the information about the global nitrous oxide budget contained in these seasonal and inter-annual patterns, we implemented a time-dependent Bayesian inversion with the NOAA/CMDL flask measurements and the chemical transport model TM3. Monthly surface fluxes were estimated for the 22 basis regions defined by the TRANSCOM project, using a priori fluxes from the GEIA inventory which includes both natural and anthropogenic contributions. The presentation will cover both the numerical methodology and the inversion results.
DE: 0315 Biosphere/atmosphere interactions
DE: 4805 Biogeochemical cycles (1615)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting