5 I-39-0195
Flight 51I; 28S, 111.4E, 06:54:14 GMT, 2 Sept 1985
Even in countries where extensive networks of meteorological stations are present,
local winds may be unobserved when they occur between stations. Usually, however,
they soon reach a weather station that can monitor their progress. At sea, it is a totally
different story. The number of weather/oceanography buoys is relatively small, and
there are vast areas of the ocean rarely frequented by ships. Geostationary weather
satellites do not yet have the resolution to sense local winds over the oceans, and
polar orbiting satellites do not have the capability to continuously monitor any given
area of the ocean.
A perfect example of the effect of a wind shear on the sea's
surface, from what is thought to have started as a squall line, was observed by the crew
aboard Discovery as they approached Perth, Australia. Spiral eddies along the edge of the
West Australian Current were visible in the sun's glitter pattern. Laid on top of the eddy
field was a horizontal wind shear extending east to west across the orbital path of the shuttle.
On the south, the wind was blowing easterly; on the north side, to the west. Wind slicks
were observed on either side, as well as along the boundary line formed in the ocean by
the sharply shearing winds.
Mesoscale wind features of this sort are ubiquitous over the
world's oceans, but because of the lack of routine detailed observations, the magnitude of
their influence on the upper layers of the sea is unknown.
Download 57.tiff high resolution TIFFfile (8.8 MB)
Atmos Composition
