Odin/SMR Limb Observations of Stratospheric Trace Gases during 2001-2005
(1) Chalmers University of Technology, Hörsalsvägen 11, 412 96 Göteborg, Sweden
J. Urban (1), D. Murtagh (1), N. Lautié (1), E. Dupuy (2),
J. de La Noë (2), P. Eriksson (1), U. Frisk (3), A. Jones (1),
E. Le Flochmoën (5), M. Olberg (4), P. Ricaud (5), J. Rösevall (1)
(1) Chalmers University of Technology, Department of Radio and Space
Science, 412 96 Göteborg, Sweden.
(2) Observatoire Aquitain des Sciences de l'Univers / L3AB, 33270
(3) Swedish Space Corporation, Box 4207, 171 04 Solna, Sweden.
(4) Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden.
(5) Observatoire de Midi-Pyrénées, Laboratoire d'Aérologie, 31400
Profile measurements of key constituents relevant to stratospheric
chemistry and dynamics such as ozone (O3), nitrous oxide (N2O),
chlorine monoxide (ClO), and nitric acid (HNO3), taken by the Odin
Sub-Millimetre Radiometer (SMR), are presented.
The Odin/SMR instrument, launched in February 2001 into a polar sun
synchronous orbit, employs 4 tunable single-sideband Schottky-diode
heterodyne receivers in the 486-581GHz spectral range and a 1.1m
telescope for passive observations of thermal emissions originating
from the Earth's limb. Spectra are recorded using two high resolution
auto-correlator spectrometers. Atmospheric measurements are performed
in a time sharing mode with astronomical observations. Profile
information is retrieved from the spectral measurements of a limb scan
by inverting the radiative transfer equation for a non-scattering
Stratospheric mode observations are performed approximately on two
observation days per week. The characteristics of the recently reprocessed Odin/SMR stratospheric mode level-2 data (version 2.0) are discussed and the data quality is evaluated by comparison with correlative measurements of other spaceborne instruments such as for example MIPAS on Envisat.
Scientific results are presented with emphasis on measurements taken in the polar winter stratosphere of both
hemispheres during the period 2001-2005. The Odin/SMR measurements of
nitrous oxide, chlorine monoxide, nitric acid, and ozone allow to
study the chemical and dynamical evolution of the Arctic and Antarctic
vortices by providing information on chlorine activation,
denitrification, subsidence of vortex air, and on ozone loss.
Odin is a Swedish-led satellite project funded jointly by Sweden
(SNSB), Canada (CSA), Finland (TEKES) and France (CNES).
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,