ON THE RELATIONS BETWEEN OUTGOING LONG-WAVE RADIATION, ALBEDO, AND CLOUDINESS

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  • 1 Extended Forecast Division, NMC, Weather Bureau, ESSA, Washington, D.C.
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Abstract

Satellite observations of outgoing long-wave radiation and albedo presented by Winston are used to test a highly simplified radiation model. Computations with the model are consistent with the satellite observations and show that the outgoing long-wave radiation is inversely correlated to the albedo and cloudiness on a broad scale. However, the satellite values of albedo are much smaller than the computed values.

In order to lower the computed values of albedo so as to agree with the satellite ones, we would have to assume that the absorption of short-wave radiation by the water vapor, dust, ozone, and clouds in the atmosphere is equal roughly to twice the values estimated by London.

Assuming that the satellite values are correct, the discrepancies in outgoing long-wave radiation are probably due to the crudeness in the values of the effective atmospheric radiation temperature used in the model which are not well known and which can, therefore, be determined from the satellite values of outgoing long-wave radiation and cloudiness.

Abstract

Satellite observations of outgoing long-wave radiation and albedo presented by Winston are used to test a highly simplified radiation model. Computations with the model are consistent with the satellite observations and show that the outgoing long-wave radiation is inversely correlated to the albedo and cloudiness on a broad scale. However, the satellite values of albedo are much smaller than the computed values.

In order to lower the computed values of albedo so as to agree with the satellite ones, we would have to assume that the absorption of short-wave radiation by the water vapor, dust, ozone, and clouds in the atmosphere is equal roughly to twice the values estimated by London.

Assuming that the satellite values are correct, the discrepancies in outgoing long-wave radiation are probably due to the crudeness in the values of the effective atmospheric radiation temperature used in the model which are not well known and which can, therefore, be determined from the satellite values of outgoing long-wave radiation and cloudiness.

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