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Super Greenhouse Effect Detection from Aqua instruments
Dan FeldmanNotes for DC Trip
10/16/05
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Clear-sky greenhouse parameter
• g increases linearly with SST for SST<298K
• g increases at a much faster rate for SST>298 K – From Ravel and
Ramanathan (1989) using ERBE data
4
4
s
skyclears
TOLRT
g
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g is sensitive to upper tropospheric H2O
• MLS (aboard AURA) sensitive to ice-water content and UT H2O
• g vs. SST similar for AIRS and MLS• Super greenhouse effect visible from both
instruments• What about convection?
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Radiative forcing due to SST>298K
• Do SSTs >298K contribute to increased cloud cover and/or cloud reflectivity to counteract conventional definition of super greenhouse effect?
• Answer may lie with AIRS and CERES data– AIRS: UT H2O, cloud fraction, SST– CERES: Albedo 0.3 um to 5 um
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Analysis period: 08/2004-01/2005
• AIRS UT H2O product agrees well with MLS and radiosondes at ARM TWP site (Nauru)
• SSTs in western Pacific ~300 K• AIRS cloud fraction well-correlated to SST >298
K• Low UT H2O correlated with low albedo as
measured by CERES. The converse statement is not as well supported by the data.
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AIRS vs. TWP radiosondes
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AIRS SST Product
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AIRS UT H2O
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AIRS Cloud Fraction
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AQUA CERES Albedo