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  • Author or Editor: J. W. Waters x
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P. C. Pandey
,
E. G. Njoku
, and
J. W. Waters

Abstract

The Scanning Multichannel Microwave Radiometer (SMMR) on the Seasat and Nimbus-7 satellite measured microwave radiation at 6.6, 10.69, 18.0, 21.0 and 37.0 GHz with both horizontal and vertical polarizations. Numerical simulations have been performed to explore the potential of using the 18.0, 21.0 and 37.0 GHZ SMMR channels with simultaneous infrared measurements of cloud top height for retrieving cloud temperature differential and thickness over the ocean. The results suggest it is possible to infer cloud vertical thickness to ∼0.4 km rms accuracy and cloud temperature differential to ∼3°C rms. These accuracies are approximately half the a prior variances.

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D. H. Staelin
,
K. F. Kunzi
,
R. L. Pettyjohn
,
R. K. L. Poon
,
R. W. Wilcox
, and
J. W. Waters

Abstract

The passive microwave spectrometer on the Nimbus 5 satellite has two channels that measure atmospheric water vapor and liquid water abundances over ocean. Observed water vapor abundances range up to 6 g cm−2 and differ from nearby radiosondes by ∼0.4 g cm−2. Average liquid water abundances over a 300 km observation zone range from −0.01 to 0.2 g cm−2, and have an rms error estimated to be ∼0.01 g cm−2 for most circumstances. These quantitative measurements can be used to construct global maps or to accumulate global statistics.

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