Lateral mixing as a source of subtropical water vapor

Details Lateral mixing as a source of subtropical water vapor Lateral mixing as a source of subtropical water vapor

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25..151p&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 2, p. 151-154

Physics

Geophysics

46

Global Change: Climate Dynamics, Global Change: Water Cycles, Mathematical Geophysics: Chaos, Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

It is hypothesized that the subtropical tropospheric water vapor distribution results from the interplay of three factors: subsidence, which brings down dry air from aloft; lateral mixing, which brings in moistened air from the convective region at various rates; and drying by processing of air through the cold extratropics. A simplified Lagrangian model is formulated, and used to study how this process works during the CEPEX period (March, 1993). A key result is that the Northern subtropics should be viewed as a general background of dry air with mass mixing ratio of 10-4 or less on the 330K surface, interrupted by a few coherent moist plumes with mixing ratios on the order of 10-3.

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