HR: 14:55h
AN: A53D-05 [Abstracts]
TI: Intercomparison of long-term changes in middle atmospheric water vapor as measured by HALOE, POAM, and
the Water Vapor Mm-wave Spectrometer (WVMS) instruments
AU: * Nedoluha, G E
EM: nedoluha@nrl.navy.mil
AF: Naval Research Lab, 4555 Overlook Ave.
Code 7227, Washington, DC 20375
United States
AU: Bevilacqua, R M
EM: bevilacqua@nrl.navy.mil
AF: Naval Research Lab, 4555 Overlook Ave.
Code 7227, Washington, DC 20375
United States
AU: Gomez, R M
EM: mike@wvms.nrl.navy.mil
AF: Naval Research Lab, 4555 Overlook Ave.
Code 7227, Washington, DC 20375
United States
AU: Hick, B C
EM: brian.hicks@nrl.navy.mil
AF: Naval Research Lab, 4555 Overlook Ave.
Code 7227, Washington, DC 20375
United States
AU: Russell, J M
EM: JAMES.RUSSELL@hamptonu.edu
AF: Hampton University, Department of Physics, Hampton, VA 23668
United States
AU: Connor, B J
EM: b.connor@niwa.cri.nz
AF: National Institue of Water and Atmospheric Research, Private Bag 50061, Omakau, 9182
New Zealand
AB:
We present 12 years of coincident water vapor measurements from the HALogen Occultation Experiment (HALOE) and several
ground-based Water Vapor Mm-wave Spectrometer (WVMS) instruments which observe from 40-80km. The WVMS instruments at Lauder,
New Zealand (45.0S, 169.7E) and Table Mountain, California (34.4N, 242.3E) both confirmed the large increase in water vapor
observed globally by HALOE from 1991-1996 (2%/year). From 1996 to the present the WVMS instruments at Lauder, New Zealand
and Mauna Loa, Hawaii (19.5N, 204.4E) and HALOE have shown no clear trend in the upper stratosphere and mesosphere. Since
measurements near the peak of the water vapor mixing ratio are not significantly affected by the vertical transport rate, the
absence of any observed trend at these altitudes indicates (with some delay in time) that there was no long-term trend in
water vapor entering the stratosphere. We will discuss the uncertainty in the observed long-term variations given
measurements from several independent instruments, including the newly reintroduced WVMS Table Mountain instrument, which has
been operating since November, 2003. We will also show how the 0.3 ppmv (4% of the water vapor at 60km) decrease in lower
stratospheric water vapor observed since 2001 by HALOE and the Polar Ozone and Aerosol Measurement (POAM) III instrument have
affected upper stratospheric measurements. Finally, we will also discuss how these effects compare to the large changes in
middle atmospheric water vapor observed in the upper stratosphere/lower mesosphere in the early 1990s.
UR: http://wvms.nrl.navy.mil
DE: 1640 Remote sensing
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting