HR: 0830h
AN: A51A-08    [Abstracts]
TI: Updated Studies in the Trends of Stratospheric Water Vapor Using SAGE II and HALOE Multi-year Measurements
AU: * Chiou, E
EM: e.chiou@larc.nasa.gov
AF: SAIC Corporation, One Enterprise Pkwy Suite 300, Hampton, VA 23666 United States
AU: Thomason, L W
EM: l.w.thomason@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 475, Hampton, VA 23681 United States
AU: Chu, W P
EM: w.p.chu@larc.nasa.gov
AF: NASA Langley Research Center, Mail Stop 475, Hampton, VA 23681 United States
AB: The SPARC Water Vapor Assessment (2000) reported that water vapor trends from HALOE satellite instrument (Version 19) exhibited positive trends (.02 to .03 ppmv/year) at altitudes 20-34 km in the northern mid latitudes for the period 1993-1997. Our trend analyses for a lower portion of this layer (16-25km), but same latitude region indicate significant negative trends varying from -.02ppmv/year to -.04ppmv/year when evaluated over the period 1994-2004. For the upper layer (26-34km), the trends were either insignificant or slightly negative. Very similar results were found for periods 1995-2004, 1996-2004, 1997-2004, 1995-2003, 1996-2003, and 1997-2003. The SAGE II (Version 6.2) data record revealed the same general results for same periods and regions. Examination of HALOE time series found relatively low water vapor mixing ratios in 1992 and 1993 when elevated aerosols abundance was present from the eruption of Mt. Pinatubo. It is speculated that this feature may be the primary cause for the postive trends reported in the SPARC Assessment. This study will elaborate on these findings and will provide additional information on derived trends over longer periods in the SAGE II record and in the southern hemisphere.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0933 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly