Relative Frequency and Diurnal Variation of High Cold Clouds in the Tropical Atlantic and Pacific

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  • 1 NASA/Goddard Laboratory for Atmospheric Sciences, Greenbelt, MD 20771
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Abstract

The percentage of cold clouds ⩽240 K was tabulated from Nimbus-5 data in 2° latitude-longitude squares over tropical oceans in the North Atlantic and Pacific for day (1130 LST) and night (2330 LST).

The maximum percentage and amplitude of the diurnal variation are in the eastern Atlantic and Pacific. Day percentages are higher than at night in the entire 6–10°N belt of the Atlantic. Weaker night maxima are to the north and south of this belt. In the Pacific, the distribution of day and night predominance is more variable.

Abstract

The percentage of cold clouds ⩽240 K was tabulated from Nimbus-5 data in 2° latitude-longitude squares over tropical oceans in the North Atlantic and Pacific for day (1130 LST) and night (2330 LST).

The maximum percentage and amplitude of the diurnal variation are in the eastern Atlantic and Pacific. Day percentages are higher than at night in the entire 6–10°N belt of the Atlantic. Weaker night maxima are to the north and south of this belt. In the Pacific, the distribution of day and night predominance is more variable.

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