Dynamic feedbacks of troposphere aerosols on marine low cloud during boreal spring

Details Dynamic feedbacks of troposphere aerosols on marine low cloud during boreal spring Dynamic feedbacks of troposphere aerosols on marine low cloud during boreal spring

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3316704k&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 16, CiteID L16704

Physics

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud/Radiation Interaction, Global Change: Climate Dynamics (0429, 3309), Global Change: Global Climate Models (3337, 4928), Atmospheric Processes: Radiative Processes

Scientific paper

The effects of troposphere aerosols on marine low cloud during boreal spring are investigated using the NASA finite-volume general circulation model with Microphysics of clouds in Relaxed Arakawa Schubert Scheme. This study shows that the marine low cloud can be modified by two types of regimes over North Pacific Ocean. In regime I, the North Pacific High (NPH) intensified by aerosol direct effects induces an increase in lower-tropospheric static stability and, hence, marine low cloud through strong inversion by adiabatic warming. In regime II, intensified NPH induces an increase of surface evaporation off the west coast of California through strong surface wind, increasing marine low cloud through the supply of moisture at sea surface and local moisture convergence. These results mean that the radiative effect due to the feedback of low cloud amounts appear to be stronger than that of the aerosol direct effect in itself.

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