. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography October 1974 RICHARD CRAM AND KIRBY HANSON 62°W 60°W 62°W 597 60°W I6°N - 14°N - 12°N -. WAVf () St—«i ) - 0 - VI |0 (1 v » S £ sr* 0 ~ k*/ *> MSS 5 WINDS Fig. 4. 19 November 1972 ERTS coverage of the Lesser Antilles: MSS band 5. as opposed to the component south of west noticed on 26 September and 19 November. Similarly, on 24 March very bright features are seen on the leeward side of the island arc. These features have a component further north
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography October 1974 RICHARD CRAM AND KIRBY HANSON 62°W 60°W 62°W 597 60°W I6°N - 14°N - 12°N -. WAVf () St—«i ) - 0 - VI |0 (1 v » S £ sr* 0 ~ k*/ *> MSS 5 WINDS Fig. 4. 19 November 1972 ERTS coverage of the Lesser Antilles: MSS band 5. as opposed to the component south of west noticed on 26 September and 19 November. Similarly, on 24 March very bright features are seen on the leeward side of the island arc. These features have a component further north of west than that seen on 13-14 October or 17 February. b. Witul and topography The winds for each area displayed in Figs. 2-6 were averaged to obtain a mean speed and direction for the region. The estimated direction of each ocean feature was also determined by measuring the angle between a meridian and a line drawn through the center of each feature. An average angle was calculated for each day. The resulting correlation between the wind and the direction of the ocean features is given in Table 1. It can be readily seen from the table that the direc- tions of the wind and ocean features are in agreement within a few degrees. Clearly, the winds and the ocean features detected by the ERTS-1 satellite are directly related. It is also suggested in Table 1 that wind speeds between 10 and 15 kt produce very well defined features on the leeward side of the islands while speeds near 20 kt greatly diminish the size and sharpness of the features as shown, for example, in the 19 November results. Duntley (1964) and others have shown that the in- tensity of reflected light from the ocean surface varies with solar zenith angle as well as wind speed. For high solar zenith angles (20°) the intensity of red light varies most rapidly with low wind speeds (3 to 13 kt); the opposite effect is seen for medium and low solar zenith angles, with the greatest change in intensity occurr
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