HR: 0800h
AN: A41B-0032    [Abstracts]
TI: Odin/SMR Observations of Water Vapour and its Isotopes in the Middle Atmosphere
AU: Murtagh, D
EM: donal.murtagh@rss.chalmers.se
AF: Chalmers University of Technology, Department of Radio and Space Science, Goteborg, 412 96 Sweden
AU: * Urban, J
EM: jo.urban@rss.chalmers.se
AF: Chalmers University of Technology, Department of Radio and Space Science, Goteborg, 412 96 Sweden
AU: Lautie, N
A41B-0032 AF: Chalmers University of Technology, Department of Radio and Space Science, Goteborg, 412 96 Sweden
AU: Kasai, Y
A41B-0032 AF: National Institute for Communications Technology, Koganei, Tokyo, 184-8795 Japan
AU: Eriksson, P
A41B-0032 AF: Chalmers University of Technology, Department of Radio and Space Science, Goteborg, 412 96 Sweden
AU: Dupuy, E
A41B-0032 AF: Observatoire Aquitain des Sciences de l'Univers, L3AB, Floirac, 33270 France
AU: de La Noe, J
A41B-0032 AF: Observatoire Aquitain des Sciences de l'Univers, L3AB, Floirac, 33270 France
AU: Frisk, U
A41B-0032 AF: Swedish Space Corporation, Box 4207, Solna, 171 04
AU: Olberg, M
A41B-0032 AF: Chalmers University of Technology, Onsala Space Observatory, Onsala, 439 92 France
AU: Le Flochmoen, E
A41B-0032 AF: Laboratoire d'Aerologie, Observatoire de Midi-Pyrenees, Toulouse, 31400 France
AU: Ricaud, P
A41B-0032 AF: Laboratoire d'Aerologie, Observatoire de Midi-Pyrenees, Toulouse, 31400 France
AU: Jimenez, C
A41B-0032 AF: University of Edinburgh JCMB, Institute of Atmospheric and Environmental Science, Edinburgh, EH9 3JZ United Kingdom
AU: Lossow, S
A41B-0032 AF: Stockholm University, Department of Meteorology, Stockholm, 106 91 Sweden
AB: Water vapour, a strong greenhouse gas, plays an important role for the dynamics of the middle atmosphere. As a reservoir of HO_x, it is also linked to many chemical processes like the natural destruction of ozone. In order to improve our knowledge of the amount and variability of water in the middle atmosphere, the Sub-Millimetre Radiometer (SMR) on board the Odin satellite, launched in February 2001, observes several thermal emission lines of water vapour in the 485-580 GHz spectral range from the Earth's limb. A band around 489 GHz is used to study water vapour and its isotopes, on the basis of 4 observation days per month. Vertical profiles of H₂O-16, H₂O-18, and HDO are retrieved between roughly 20 and 70 km in the stratosphere and mesosphere. A strong water vapour line at 557 GHz is simultaneously measured in a second band, providing information in the mesosphere and lower thermosphere between about 40 and 100 km. Measurements of H₂O-17 at 551 GHz in monthly intervals complete the picture of middle atmospheric water vapour provided by Odin. The unique and original measurements of the isotopes HDO, H₂O-18, and H₂O-17 in the 20-70 km altitude range allow to study the isotopic depletion / enrichment of water, potentially supplying information on the origin of stratospheric water vapour: transport of tropospheric air through the tropical tropopause layer (TTL) vs in-situ chemical production by methane oxidation. Besides a presentation of the Odin data on middle atmospheric water vapour, an evaluation by comparison with measurements from other satellite sensors such as AURA/MLS is anticipated. Odin is a Swedish-led satellite project funded jointly by Sweden (SNSB), Canada (CSA), Finland (TEKES) and France (CNES).
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005