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Evaluation of Cloud Shading Effects on the Generation and Modification of Mesoscale Circulations

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  • 1 Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523,
  • | 2 Regional and Mesoscale Meteorology Branch, Development Laboratory, NOAA/NESS, Colorado State University, Fort Collins, CO 80523
  • | 3 Cooperative Institute for Research in the Atmosphere, Colorado State University. Fort Collins, CO 80523 and
  • | 4 Cooperative Institute for Research in the Atmosphere, Colorado State University. Fort Collins, CO 80523 and
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Abstract

This study presents scale analysis and numerical model evaluations of the impact of cloud shading on 1) the development of sea breeze and thermally induced upslope flows and 2) the generation of mesoscale circulations between cloudy areas adjacent to clear areas. Based on the assumption of modifications of solar and longwave radiation which are typical for some overcast conditions, it was found that the reduction in the first type of circulation is significant and most noticeable in the vertical velocities. In the second case, thermally induced circulations in favorable conditions appear to approach the typical intensity of the sea breeze.

Abstract

This study presents scale analysis and numerical model evaluations of the impact of cloud shading on 1) the development of sea breeze and thermally induced upslope flows and 2) the generation of mesoscale circulations between cloudy areas adjacent to clear areas. Based on the assumption of modifications of solar and longwave radiation which are typical for some overcast conditions, it was found that the reduction in the first type of circulation is significant and most noticeable in the vertical velocities. In the second case, thermally induced circulations in favorable conditions appear to approach the typical intensity of the sea breeze.

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