HR: 11:05h
AN: A31G-04    [PDF]
TI: Stratosphere-Troposphere Mass Exchange
AU: * Schoeberl, M R
EM: mark.r.schoeberl@nasa.gov
AF: NASA/GSFC, Code 916 NASA/GSFC, Greenbelt, Md 20771 United States
AB: Global mass exchange between the troposphere and the stratosphere can be computed simply by estimating the heating rate along the 380K surface and the time rate of change of the middle world stratosphere (region between the tropopause and 380K). However, given the heating rate at the tropopause as well, the diabatic and adiabatic mass fluxes can be computed as well. The adiabatic and diabatic fluxes at the tropopause have been computed using three different data sets: the FVGCM and two assimilation data sets, FVDAS, and UKMO. The net tropopause flux is found to be comparable to that diagnosed by Appenzeller et al. [1996]. The diabatic flux across the tropopause is usually larger than the net flux, and both are downward (exiting the middle world stratosphere). This means that the tropospheric adiabatic flux is, on the average into the middle world stratosphere. Each of the data sets agree on this point; however, but it is the opposite conclusion obtained by some earlier researchers. This result implies that the middle world stratosphere is a region which is constantly being diluted by tropospheric air.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0342 Middle atmosphere--energy deposition
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting