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Water vapor isotopologue retrievals from high-resolution GOSAT shortwave infrared spectra

Frankenberg, C. and Wunch, D. and Toon, G. and Risi, C. and Scheepmaker, R. and Lee, J.-E and Wennberg, P. O. and Worden, J. (2013) Water vapor isotopologue retrievals from high-resolution GOSAT shortwave infrared spectra. Atmospheric Measurement Techniques, 6 (2). pp. 263-274. ISSN 1867-1381.

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Remote sensing of the isotopic composition of water vapor can provide valuable information on the hydrological cycle. Here, we demonstrate the feasibility of retrievals of the relative abundance of HDO (the HDO/H_2O ratio) from the Japanese GOSAT satellite. For this purpose, we use high spectral resolution nadir radiances around 6400 cm^(−1) (1.56 μm) to retrieve vertical column amounts of H_2O and HDO. Retrievals of H_2O correlate well with ECMWF (European Centre for Medium-Range Weather Forecasts) integrated profiles (r^2 = 0.96). Typical precision errors in the retrieved column-averaged deuterium depletion (δD) are 20–40‰. We compare δD against a TCCON (Total Carbon Column Observing Network) ground-based station in Lamont, Oklahoma. Using retrievals in very dry areas over Antarctica, we detect a small systematic offset in retrieved H_2O and HDO column amounts and take this into account for a bias correction of δD. Monthly averages of δD in the June 2009 to September 2011 time frame are well correlated with TCCON (r^2 = 0.79) and exhibit a slope of 0.98 (1.23 if not bias corrected). We also compare seasonal averages on the global scale with results from the SCIAMACHY instrument in the 2003–2005 time frame. Despite the lack of temporal overlap, seasonal averages in general agree well, with spatial correlations (r^2) ranging from 0.62 in September through November to 0.83 in June through August. However, we observe higher variability in GOSAT δD, indicated by fitted slopes between 1.2 and 1.46. The discrepancies are likely related to differences in vertical sensitivities but warrant further validation of both GOSAT and SCIAMACHY and an extension of the validation dataset.

Item Type:Article
Related URLs:
URLURL TypeDescription
Frankenberg, C.0000-0002-0546-5857
Wunch, D.0000-0002-4924-0377
Risi, C.0000-0002-8267-453X
Wennberg, P. O.0000-0002-6126-3854
Additional Information:© 2013 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. Received: 11 July 2012. Published in Atmos. Meas. Tech. Discuss.: 6 September 2012 Revised: 19 December 2012. Accepted: 21 December 2012. Published: 7 February 2013. Part of the research described in this paper was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. GOSAT Level 1B products (spectral data) were provided by the GOSAT Project (JAXA, NIES, and Ministry of the Environment Japan). US funding for TCCON comes from NASA’s Terrestrial Ecology Program (NNX08A186G), the Orbiting Carbon Observatory Program (NAS7-03001), the DOE/ARM Program and the Atmospheric CO_2 Observations from Space Program. R.S. was funded by the Netherlands Space Office as part of the User Support Programme Space Research under project GO-AO/16. Edited by: M. Weber.
Funding AgencyGrant Number
Netherlands Space OfficeGO-AO/16
Issue or Number:2
Record Number:CaltechAUTHORS:20150220-135225324
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Official Citation:Frankenberg, C., Wunch, D., Toon, G., Risi, C., Scheepmaker, R., Lee, J.-E., Wennberg, P., and Worden, J.: Water vapor isotopologue retrievals from high-resolution GOSAT shortwave infrared spectra, Atmos. Meas. Tech., 6, 263-274, doi:10.5194/amt-6-263-2013, 2013.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55067
Deposited By: Ruth Sustaita
Deposited On:21 Feb 2015 16:40
Last Modified:03 Oct 2019 08:02

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