Comparing Arctic Cloud Amounts

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Comparing Arctic Cloud Amounts MODIS and
APP-x MOD35 and AVHRR Polar Pathfinder Extended
Data Sets
Richard Frey Cloud Climatology Workshop Madison,
WI July 7, 2006
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Not a climatology comparison Preliminary
investigation Waiting on fully reprocessed
Terra and Aqua Compared monthly means of
Collection 5 Terra MODIS Provisional C5
data from August 2001 July 2002 Brief
comparison with GLAS and surface observations As
MODIS cloud detection algorithms mature How
do MODIS polar cloud amounts compare with
long-term records like APP-x? Gain
experience when inter-comparing polar data from
different instruments of same type,
differing types
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Large diffs N. Canada, N. Russia, Siberia
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Large diffs Bering Strait, Norwegian
Sea, Central Arctic Ocean
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Arctic has low sun but still very cold.
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Large diffs N. Canada, N. Russia, Central
Arctic Ocean Large diffs Beaufort
Sea, Hudson Bay, Foxe Basin, Davis Strait, SE
Greenland
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Greater uncertainty during transition seasons and
terminator regions.
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Large diffs N. Canada, N. Russia, Greenland
coast
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Large diffs East Siberian Sea
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Large diffs N. Russia, E. Siberia, Yukon, Hud
son Bay, Baffin Bay Large diffs W Arctic
Ocn, E Greenland
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Little information for clear vs. cloudy sky
discrimination during polar winter leads to
greater uncertainties.
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