Abstract
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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