Module Seven Writing Assignment

Module Seven Writing Assignment - Module Seven Writing...

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Module Seven Writing Assignment Ground based measurements of Ozone were first started in 1956, in at Halley Bay, Antarctica. During the period between 1978 and 1991 a 3% depletion in the ozone layer was measured by the Nimbus-7 satellite. Nimbus-7 carried a TOMS (total ozone mapping spectrometer, and a SBUV. The depletion increases with latitude, and is somewhat larger in the Southern Hemisphere. Over the US, Europe and Australia 4% per decade is a typical measurement but there was no significant ozone loss in the tropics during the same period. The depletion is larger in the winter months, smaller in the summer. Between 1991 and 1993 ozone depletion appeared to accelerate. A full 4% below the average value for the preceding twelve years and 2-3% below the lowest values observed in the earlier period. By February 1994 ozone over the United States had recovered to levels similar to 1991. Reductions in ozone levels
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Module Seven Writing Assignment - Module Seven Writing...

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