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Measurements of upper troposheric humidity at low temperatures during CRYSTAL-FACE

Show simple item record Herman, Robert L. Heymsfield, Andrew J. Ridley, Brian A. Bui, Paul T. 2006-03-30T17:03:59Z 2006-03-30T17:03:59Z 2003-04-09
dc.identifier.citation Joint EGS/AGU Meeting, Nice, France, April 09, 2003. en
dc.identifier.clearanceno 03-0927
dc.description.abstract Aircraft condensation trails (contrails) and thin cirrus were studied by instruments on the NASA WB-57F high-altitude aircraft during contrails and optically thing cirrus are contrasted by different levels of supersaturation with respect to ice. During the July 13, 2002, flight of the WB-57F aircraft intercepted visible contrails produced by both the WB-57F and ER-2 aircraft. These contrails were located immediately below the local tropopause, where ambient temperatures were very low (-76 degree C). The contrails were clearly indicated by an abrupt increase in NO and a simultaneous, abrupt decrease in ice supersaturation. With in the contrail, the relative humidity was close to 130% with respect to ice, higher than expected from theory. Outside the contrails was a persistent layer of subvisible currus extending from approximately 13 to 15 km altitude. This layer was characterized y significant supersaturations because the ambient concentrations of ice particles were insufficient to significantly deplete the ice supersaturation. We will discuss in situ measurements and models simulations of humidity. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 188876 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2003. en
dc.subject water vapor en
dc.subject cirrus en
dc.subject cloud microphysics en
dc.title Measurements of upper troposheric humidity at low temperatures during CRYSTAL-FACE en
dc.type Preprint en

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