Method and results of retrieval of HDO/H2O in atmosphere from IMG/ADEOS and FTIR data / Toptygin A.Yu., Gribanov K.G., Zakharov V.I., Kasai Y., Kagawa A., Murayama Y., Imasu R., Schmidt G.A., Hoffmann G., Jouzel J. // Proceedings of SPIE - The International Society for Optical Engineering. - 2006. - V. 6580, l. .

ISSN:
0277786X
Type:
Conference Paper
Abstract:
Here we present a Principal Components (PCs) method of retrieval of the HDO/H2O vertical profile using atmospheric radiances observed from space by sensor like IMG as well as atmospheric transmittance spectra observed by ground based FTIR The method is based on the expansion of the retrieved profile on eigenvectors of covariance matrix of model profiles extracted from the isotopic Atmospheric General Circulation Model (AGCM). A priori information of covariance matrix compensates partially the lack of information containing in weighting functions for HDO in lower atmospheric layer (0-1 km) and layers above 10 km. Error estimation of the retrieval scheme was made using closed model computations with synthetic spectra of IMG and known sets of T, H 2O, HDO profiles and its value is within 8‰ - 70‰ for vertical profile and not greater than 18‰ for columnar value of HDO/H2O ratio. The method was applied to IMG/ADEOS spectra measured over the ocean in clear sky conditions. Latitudinal distributions of HDO/H 2O profile and columnar HDO/H2O ratio are retrieved over Pacific Ocean for the time interval from winter of 1996 to summer of 1997. The retrieved HDO/H2O from IMG/ADEOS data and simulated with isotopic AGCM are in a good agreement. FTIR is Poker Flat high resolution ground based Fourier transform spectrometer for up-looking observation of atmosphere in the spectral range from 750-4300 cm-1 with resolution 0.0019 cm -1 and high signal to noise ratio. The spectrometer is located at the Poker Flat Research Range (Altitude 0.61km; latitude 65. 11N; longitude 147.42 W) of the Geophysical Institute at the University of Alaska Fairbanks. Poker Flat FTS is operating from 1999, observation modes are atmospheric emission and solar radiation absorption. The measured atmospheric transmittances are supported by sonde observations of T and water vapour profiles. The HDO/H 2O PCs retrieval method was also adapted for using the high spectral resolution atmospheric transmittances observed by FTIR. Linear regression of PCs of the HDO/H2O profiles was obtained in this case. Error estimation of the retrieval scheme was made using closed model computations with synthetic spectra of the FTIR and known sets of T, H2O, HDO profiles and its value is within 6‰ - 67‰ for vertical profile but not greater than 10‰ for columnar value of HDO/H2O ratio. As an example, HDO/H2O vertical profiles were retrieved using a few samples of FTIR spectra observed at the Poker Flat Research Range from 2000 to 2004 and compared with isotope AGCM outputs for Alaska's atmosphere.
Author keywords:
Atmosphere; Remote sensing; Water vapour isotopes
Index keywords:
Atmospheric radiation; Deuterium; Eigenvalues and eigenfunctions; Fourier transform infrared spectroscopy; Principal component analysis; Remote sensing; Statistical methods; Water; Atmospheric General
DOI:
10.1117/12.724949
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-33846808900&doi=10.1117%2f12.724949&partnerID=40&md5=b72e5e4a23447528fa3520b85921a8da
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Art. No. 65800X
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Affiliations Global Ecology and Remote Sensing Lab., Physics Department, Ural State University, 51 Lenin ave., 620083, Yekaterinburg, Russian Federation; Applied Research and Standards Department, National Institute of Information and Communications Technology (NICT), 4-2-1, Nukui-Kitamachi, Koganei, Tokyo, 184-8795, Japan; Center for Climate System Research, University of Tokyo, General Research Building, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8568, Japan; NASA Goddard Institute for Space Studies, Center for Climate System Research, Columbia University, 2880 Broadway, New York, NY 10025, United States; IPSL, Laboratoire des Sciences du Climat et de l'Environnement, Orme des Merisiers, 91191 Gif sur Yvette, France
Author Keywords Atmosphere; Remote sensing; Water vapour isotopes
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Correspondence Address Toptygin, A.Yu.; Global Ecology and Remote Sensing Lab., Physics Department, Ural State University, 51 Lenin ave., 620083, Yekaterinburg, Russian Federation
Sponsors Optical Society of America;SPIE Russia Chapter;Russian Foundation for Basic Research;Bruker LTD., Russia
Conference name 15th Symposium on High-Resolution Molecular Spectroscopy
Conference date 18 July 2006 through 21 July 2006
Conference location Nizhny Novgorod
Conference code 69133
ISBN 0819467022; 9780819467027
CODEN PSISD
Language of Original Document English
Abbreviated Source Title Proc SPIE Int Soc Opt Eng
Source Scopus