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Ramesh V. Godbole

Abstract

Quantitative estimates of the exchange of heat by radiation between the earth's surface and the atmosphere have been provided for the North Atlantic region during a representative winter season (1956–57). The evacuations were made with the aid of Elsasser's radiation chart. The primary data used were the soundings of the ocean weather stations and Bermuda and Azores. Though the network of stations is rather open, the broad aspects of the pattern stand out with clarity. In particular, this is true of the configurations associated with the mobile cyclones in various stage of development, the meridional variation and the influences due to the distribution of continents and oceans.

The divergence of the vertical radiative flux of heat was evaluated at all stations, and it was found that the locations of the main Ion by the atmosphere are situated at about 800 mb and in the upper part of the troposphere.

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RAMESH V. GODBOLE

Abstract

Destabilization of clouds due to long-wave radiation is computed as the difference in the radiative cooling rates across the cloud layer. The changes in destabilization and cooling rates due to changes in cloud amount, cloud altitude, cloud thickness, and temperature structure of the lower layer have been assessed separately.

Changes in cloud amount cause large changes in the destabilization value and cooling rates near the top and base of the cloud. For a given cloud layer, destabilization is less in low clouds than in middle or high clouds. The presence of an inversion is equivalent to that of a cloud layer and is associated with weak destabilization.

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