Abstract
The global and the regional distributions of the time-averaged stratospheric-tropospheric (ST) mass exchange were analyzed. Using a mathematical formulation of ST exchange, the cross-tropopause mass flux was diagnosed globally for January 1979, and contributions by physical mechanisms including the diabatic transport and the quasi-horizontal adiabatic transport along isentropes that intersect the tropopause surface were evaluated. Two regions of mass flux zonally integrated into the stratosphere were found: one over tropical latitudes associated with diabatic transports, and a second one over subpolar latitudes associated with adiabatic transport. The results are consistent with independent analyses of trace atmospheric constituents.
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