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Mass and Ozone Fluxes from the Lowermost StratosphereNet mass flux from the stratosphere to the troposphere can be computed from the heating rate along the 380K isentropic surface and the time rate of change of the mass of the lowermost stratosphere (the region between the tropopause and the 380K isentrope). Given this net mass flux and the cross tropopause diabatic mass flux, the residual adiabatic mass flux across the tropopause can also be estimated. These fluxes have been computed using meteorological fields from a free-running general circulation model (FVGCM) and two assimilation data sets, FVDAS, and UKMO. The data sets tend to agree that the annual average net mass flux for the Northern Hemisphere is about 1P10 kg/s. There is less agreement on the southern Hemisphere flux that might be half as large. For all three data sets, the adiabatic mass flux is computed to be from the upper troposphere into the lowermost stratosphere. This flux will dilute air entering from higher stratospheric altitudes. The mass fluxes are convolved with ozone mixing ratios from the Goddard 3D CTM (which uses the FVGCM) to estimate the cross-tropopause transport of ozone. A relatively large adiabatic flux of tropospheric ozone from the tropical upper troposphere into the extratropical lowermost stratosphere dilutes the stratospheric air in the lowermost stratosphere. Thus, a significant fraction of any measured ozone STE may not be ozone produced in the higher Stratosphere. The results also illustrate that the annual cycle of ozone concentration in the lowermost stratosphere has as much of a role as the transport in the seasonal ozone flux cycle. This implies that a simplified calculation of ozone STE mass from air mass and a mean ozone mixing ratio may have a large uncertainty.
Document ID
20040171823
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Schoeberl, Mark R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Olsen, Mark A.
(Maryland Univ. Baltimore County Catonsville, MD, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Environment Pollution
Meeting Information
Meeting: Quadrennial Ozone Symposium
Location: Kos
Country: Greece
Start Date: June 1, 2004
End Date: June 8, 2004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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