Physics
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3606807v&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 6, CiteID L06807
Physics
14
Atmospheric Processes: Remote Sensing, Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Radiative Processes
Scientific paper
Several recent studies have found that the brightness of clear sky systematically increases near clouds. Understanding this increase is important both for a correct interpretation of observations and for improving our knowledge of aerosol-cloud interactions. However, while the studies suggested several processes to explain the increase, the significance of each process is yet to be determined. This study examines one of the suggested processes-three-dimensional (3-D) radiative interactions between clouds and their surroundings-by analyzing a large dataset of MODIS (Moderate Resolution Imaging Spectroradiometer) observations over the Northeast Atlantic Ocean. The results indicate that 3-D effects are responsible for a large portion of the observed increase, which extends to about 15 km away from clouds and is stronger (i) at shorter wavelengths (ii) near optically thicker clouds and (iii) near illuminated cloud sides. This implies that it is important to account for 3-D radiative effects in the interpretation of solar reflectance measurements over clear regions in the vicinity of clouds.
Marshak Alexander
Várnai Tamás
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