Physics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3616804m&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 16, CiteID L16804
Physics
10
Atmospheric Processes: Convective Processes, Atmospheric Processes: Precipitation (1854), Atmospheric Processes: Tropical Meteorology, Atmospheric Processes: Boundary Layer Processes, Atmospheric Processes: Theoretical Modeling
Scientific paper
Several observational studies have shown a tight relationship between tropical precipitation and column-integrated water vapor. We show that the observed relationship in the tropics between column-integrated water vapor, precipitation, and its variance can be qualitatively reproduced by a simple and physically motivated two-layer model. It has previously been argued that features of this relationship could be explained by analogy with the theory of continuous phase transitions. Instead, our model explicitly assumes that the onset of precipitation is governed by a stability threshold involving boundary-layer water vapor. This allows us to explain the precipitation-humidity relationship over a broader range of water vapor values, and may explain the observed temperature dependence of the relationship.
Back Larissa E.
Emanuel Kerry A.
Muller Caroline J.
O'Gorman Paul A.
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