Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2347j&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 15, p. 2347-2350
Physics
32
Atmospheric Composition And Structure, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles
Scientific paper
Measurements of water vapor from the Microwave Limb Sounder on the Upper Atmospheric Research Satellite show that humidities in the extreme tropical upper troposphere are often near saturation with respect to ice. These high humidity values are supported by the available accurate in situ water vapor measurements near the tropical tropopause. A nearly saturated upper troposphere reduces the outgoing longwave radiative flux at the top of the atmosphere by about 1-2 W-m-2 compared to the radiative flux calculated using a standard atmospheric humidity profile. Subvisible cirrus near the tropopause reduce the outgoing longwave radiation an additional few W-m-2 as well as increasing the radiative heating near the tropopause. Changes in the humidity frequency distribution in this region of the atmosphere and the associated changes in subvisible cirrus frequency would substantially impact the radiative budget of the tropics.
Jensen Eric J.
Mergenthaler John
Pfister Leonhard
Read William G.
Sandor Brad J.
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