Shortwave radiative forcing by stratospheric water vapor

Details Shortwave radiative forcing by stratospheric water vapor Shortwave radiative forcing by stratospheric water vapor

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30c..13z&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 3, pp. 13-1, CiteID 1113, DOI 10.1029/2002GL016042

Physics

Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition, Hydrology: Water/Energy Interactions, Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: Radiative Processes

Scientific paper

It is shown that most previous estimates of radiative forcing due to increased stratospheric water vapor have been overestimates because most broad-band radiation schemes underestimate the (negative) shortwave component. This paper compares line-by-line calculations of shortwave forcing with those of five broad and multiple band radiation schemes, including a new parameterization of water vapor absorption which reduces the errors to within 3%. The results of two-dimensional model experiments indicate that the magnitude of the shortwave forcing should be approximately doubled, relative to previous estimates. As a result, estimates of global average net radiative forcing due to stratospheric water vapor increase should be decreased by approximately 10%.

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