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October 2000
NASA Earth Probe TOMS Images
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Ozone Measurement
1 Dobson Unit (DU) is defined to be 0.01 mm
thickness at STP (standard temperature and pressure). Ozone layer thickness is
expressed in terms of Dobson units, which measure what its physical thickness
would be if compressed in the Earth's atmosphere.
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NASA decided to change the EP/TOMS
operational processing configuration in order to apply a correction for
the cross-track bias errors that have grown large over the past year or
so. These data are being made available at the TOMS web site on an
operational basis. Data starting August 1, 2001 will be reprocessed with
this configuration and made available as well to provide a consistent
data set over the 2001 ozone hole season. The data previous to August
are the old data, so a discontinuity will be seen at the July 31 /
August 1, 2001 boundary. The reprocessed ozone images will also use the
new color scale. The cross-track bias correction will remove almost all
of the cross-track bias, but will not remove residual long-term changes
in ozone due to related instrument degradation. The current EP/TOMS data
should not be used for studies of long-term changes in ozone beyond the
summer of 2000.
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The white
area on the images is where data cannot be retrieved in the earth's
shadow or polar night regions by the satellite. |
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