Atmospheric Chemistry and Physics Discussions
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2007
10.5194/acpd-7-4857-2007
http://www.atmos-chem-phys-discuss.net/7/4857/2007/
http://www.atmos-chem-phys-discuss.net/7/4857/2007/acpd-7-4857-2007.html
http://www.atmos-chem-phys-discuss.net/7/4857/2007/acpd-7-4857-2007.pdf
4857
4888
2007-04-05
Global distributions of water vapour isotopologues retrieved from IMG/ADEOS data
H. Herbin
hherbin@ulb.ac.be
D. Hurtmans
S. Turquety
C. Wespes
B. Barret
J. Hadji-Lazaro
C. Clerbaux
P.-F. Coheur
Spectroscopie de l'Atmosphère, Service de Chimie Quantique et de Photophysique, Université Libre de Bruxelles (U.L.B.), Brussels, Belgium
Service d'Aéronomie/IPSL, CNRS, Université Pierre et Marie Curie, Paris, France
now at: Laboratoire d'Aérologie, UMR 5560 CNRS/Université Paul Sabatier, Observatoire de Midi-Pyrénées, Toulouse, France
Research Associate with the F.N.R.S, Belgium
The analysis of the atmospheric isotopologic water vapour composition
provides valuable information on many climate, chemical and atmospheric
circulation processes. The remote-sensing of the water isotopologues remains
a challenge, which is enhanced by the large and fast variations of their
spatial distributions. This paper presents for the first time the
simultaneous retrieval of global distributions of the main water
isotopologues (i.e.~H<sub>2</sub><sup>16</sup>O, H<sub>2</sub><sup>18</sup>O, HOD) and their ratios.
The results are obtained by exploiting the high resolution infrared spectra
recorded by the Interferometric Monitor for Greenhouse gases (IMG)
instrument, which operated in the nadir geometry onboard the ADEOS satellite
between 1996 and 1997. The retrievals are performed on a series of
cloud-free radiance measurements in two atmospheric windows (1205–1228
cm<sup>–1</sup>; 2004–2032 cm<sup>–1</sup>) using a line-by-line radiative transfer
model and an inversion procedure based on the Optimal Estimation Method
(OEM). Characterizations in terms of vertical sensitivity and error budget
are provided. A relatively high vertical resolution is achieved for
H<sub>2</sub><sup>16</sup>O (~4–5 km), and we show that the retrieved profiles
are in good agreement with local sonde measurements, representative of
different latitudes. The retrieved global distributions of H<sub>2</sub><sup>16</sup>O,
H<sub>2</sub><sup>18</sup>O, HOD and their ratios are also found to be consistent with
previous experimental studies and models. The ocean-earth difference, the
latitudinal and vertical dependence of the water vapour amount and the
isotopologic depletion are notably well reproduced. Others trends, possibly
related to smaller scales variations in the vertical profiles are also
discussed. Despite the difficulties encountered for computing accurately the
isotopologic ratios, our results demonstrate the ability of the infrared
nadir sounding for monitoring atmospheric isotopologic water vapour
distributions on a global scale.
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