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Water vapor and cloud feedback over the tropical oceans: Can we use ENSO as a surrogate for climate change?
Author(s) -
Lau K.M.,
Ho C.H.,
Chou M.D.
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl02414
Subject(s) - water vapor , cloud feedback , climatology , environmental science , radiative forcing , forcing (mathematics) , radiative transfer , atmospheric sciences , greenhouse gas , cloud forcing , climate model , climate change , climate sensitivity , sea surface temperature , meteorology , physics , geology , oceanography , quantum mechanics
Based on experiments with the Goddard Earth Observing System (GEOS) global climate model, we find that the basic patterns of anomalous water vapor greenhouse effect and cloud radiative forcing during ENSO are primarily determined by the basin‐wide dynamical response to large scale sea surface temperature (SST) forcing. There is no supergreenhouse effect in the sense of unstable interaction due to local thermodynamics and water vapor radiative feedback on interannual time scales. About 80% of the clear sky water vapor greenhouse sensitivity to SST deduced from ENSO anomalies are due to the transport of water vapor by the large scale circulation. The sensitivity of water vapor greenhouse effect to SST due to radiative feedback is found to be about 1.8 Wm −2 /°C, much smaller than the values of 6–9 Wm −2 /°C previously estimated from satellite observations from ENSO conditions. Our results show that regionally based interannual variability should not be used to infer radiative feedback sensitivity for climate change unless proper corrections are made for the effect of the large scale circulation.