Estimation of aerosol direct radiative effects over the mid-latitude North Atlantic from satellite and in situ measurements

Details Estimation of aerosol direct radiative effects over the mid-latitude North Atlantic from satellite and in situ measurements Estimation of aerosol direct radiative effects over the mid-latitude North Atlantic from satellite and in situ measurements

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1731b&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 12, p. 1731-1734

Other

15

Atmospheric Composition And Structure: Aerosols And Particles, Global Change: Climate Dynamics, Meteorology And Atmospheric Dynamics: Radiative Processes

Scientific paper

We estimate solar radiative flux changes due to aerosols over the mid-latitude North Atlantic by combining optical depths from AVHRR measurements with aerosol properties from the recent TARFOX program. Results show that, over the ocean, the aerosol decreases the net radiative flux at the tropopause and therefore has a cooling effect. Cloud-free, 24-hour average flux changes range from -9 W/m2 near the eastern US coast in summer to -1 W/m2 in the mid-Atlantic during winter. Cloud-free North Atlantic regional averages range from -5.1 W/m2 in summer to -1.7 W/m2 in winter, with an annual average of -3.5 W/m2. Cloud effects, estimated from ISCCP data, reduce the regional annual average to -0.8 W/m2. All values are for the moderately absorbing TARFOX aerosol (ω(0.55μm)=0.9) values for a nonabsorbing aerosol are ~30% more negative. We compare our results to a variety of other calculations of aerosol radiative effects.

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