Winter intensification of the moist branch of the circulation in simulations of 21st century climate

Details Winter intensification of the moist branch of the circulation in simulations of 21st century climate Winter intensification of the moist branch of the circulation in simulations of 21st century climate

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3720707l&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 20, CiteID L20707

Physics

3

Global Change: Atmosphere (0315, 0325), Global Change: Global Climate Models (3337, 4928), Global Change: Water Cycles (1836), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513)

Scientific paper

In this paper, changes in isentropic circulations associated with global warming in the A1B model outputs for the 20th and 21st centuries are analyzed. The changes in the circulations on dry and moist isentropes are quantified through the use of three bulk measures of the circulations: mass transport, entropy transport and effective stratification. The circulation on dry isentropes is expected to weaken due to a reduction of the meridional heat transport and to an increase in stratification. In contrast, the moist branch of the circulation, measured in terms of the difference between the circulations on moist and dry isentropes, strengthens during the winter months. This intensification is characterized not only by an increase in the eddy latent heat transport but also by an increase in the mass transport. This indicate a larger poleward mass flow of warm moist subtropical air into the stormtracks leading to enhanced moist ascent within baroclinic eddies.

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