Trade wind cumuli statistics in clean and polluted air over the Indian Ocean from in situ and remote sensing measurements

Details Trade wind cumuli statistics in clean and polluted air over the Indian Ocean from in situ and remote sensing measurements Trade wind cumuli statistics in clean and polluted air over the Indian Ocean from in situ and remote sensing measurements

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3121105m&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 21, CiteID L21105

Physics

11

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Cloud Physics And Chemistry, Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: Remote Sensing, Meteorology And Atmospheric Dynamics: Radiative Processes

Scientific paper

Relationships between trade wind cumuli coverage and aerosol concentration Na, and between cloud optical thickness τc and Na are examined using in situ and remote sensing observations acquired on 4 days within and downwind of the Indo-Asian haze. Cloud top height and cloud coverage decrease as Na increases, whereas τc increases, which could be due to aerosol or meteorological effects. Clouds with horizontal sizes less than 2 km, neglected in prior studies, contribute up to 40% to cloud area, and must be considered in studies of aerosol indirect and semi-direct effects. When radiative transfer models are applied to the observations, a regional change in top of the atmosphere TOA (surface) 0.64 μm radiative forcing of approximately +6 (+7) W m-2 μm-1 associated with changes in cloud properties is found. To the degree that synoptic-scale forcings do not vary systematically as air flows south, the results may be interpreted as the dominance of semi-direct over indirect forcing within the Indo-Asian haze for the times sampled.

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