Super Greenhouse Effect Detection from Aqua instruments
Dan FeldmanNotes for DC Trip
10/16/05
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
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?
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
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.
AIRS vs. TWP radiosondes
AIRS SST Product
AIRS UT H2O
AIRS Cloud Fraction
AQUA CERES Albedo
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