关键词: 沙尘, 稳定度, 层云

Abstract:

Massive dust aerosols from the Northwest Africa exporting to the research region (50°W～20°W, 10°N～25°N) during the summer season, with a peak in July, are regularly ob-served by satellite. Dust aerosols are confined within the layer between two inversions. Themain effect of them is to heat the lower troposphere, but cool the surface, so the presence ofdust may cause a stabilizing effect on the temperature lapse rate, then affect the ocean low-lev-el stratus cover. Attempt to illustrate these relations based mainly on the satellite measure-ment of cloud and dust amount in July for six years (1984～1989). The results show that, inthis location, the presence of dust may influence the stratus cover through media of static sta-bility, although the signal is not easy to be revealed due to a few disturbances of undesirablefactors.

Key words: dust aerosol, stability, stratus