HR: 15:25h
AN: A43G-07    [Abstracts]
TI: Tropospheric transport climate partitioned by surface origin and transit time
AU: * Holzer, M
EM: hm2220@columbia.edu
AF: Department of Applied Physics and Applied Mathematics, Columbia University, c/o NASA-GISS 2880 Broadway, New York, NY 10025, United States
AU: * Holzer, M
EM: hm2220@columbia.edu
AF: Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T1Z4, Canada
AU: Hall, T M
EM: thall@giss.nasa.gov
AF: Department of Applied Physics and Applied Mathematics, Columbia University, c/o NASA-GISS 2880 Broadway, New York, NY 10025, United States
AB: We perform the first analysis of tropospheric transport using the global boundary-propagator Green function, G, which partitions air at every point and time according to both the transit time since last surface contact and the location of that contact. We compute G for a 3-year period with the MATCH model driven by NCEP re-analyses. Last contact time is resolved in 3-day intervals, and last-contact location with a global tiling of 41 patches concentrated in the Northern Hemisphere. The transport climate is quantified for four midlatitude receptor regions in terms of the seasonal-mean surface-origin and transit-time partitioning of the column burden, the surface flux of newly arriving air, and the distribution of airmass in transit from source to receptor surface. At long transit times a nearly receptor independent pattern of last contact location is governed by where air is injected into the upper troposphere by deep convection and the high terrain of Tibet. The receptor origin composition of the column burden changes only slowly after ~40 days for winter and fall, while the composition of the flux onto the receptor continues to change at ~60 days. European and SE Asian air contribute comparably to the flux onto eastern N America, in spite of SE Asian air having the dominant burden. The flux of European air onto SE Asia in winter and fall is larger than the flux of SE Asian air onto Europe. The surface-to-surface transport mass distribution, ℛ, is used to identify transit-time dependent source- receptor teleconnections.
DE: 0368 Troposphere: constituent transport and chemistry
DE: 3307 Boundary layer processes
DE: 3309 Climatology (1616, 1620, 3305, 4215, 8408)
DE: 3319 General circulation (1223)
DE: 3364 Synoptic-scale meteorology
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting