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Erratum published on 22 June 2016, see Remote Sens. 2016, 8(6), 527.

Correction published on 29 November 2016, see Remote Sens. 2016, 8(12), 982.

Open AccessArticle
Remote Sens. 2016, 8(5), 414; doi:10.3390/rs8050414

Comparison of XH2O Retrieved from GOSAT Short-Wavelength Infrared Spectra with Observations from the TCCON Network

1
National Institute for Environmental Studies (NIES), 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
2
Center for Atmospheric Chemistry, School of Chemistry, Northfields Ave, University of Wollongong, NSW 2522, Australia
3
Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, Bremen 28359, Germany
4
BC Consulting Limited, 6 Fairway Dr., Alexandra 9320, New Zealand
5
Institut d’Aéronomie Spatiale de Belgique (BIRA-IASB), 3 Avenue Circulaire, Brussels B-1180, Belgium
6
Karlsruhe Institute of Technology, IMK-ASF, Hermann-von-Helmholtz-Platz 1, Leopoldshafen 76344, Germany
7
FMI-Arctic Research Center, Tähteläntie 62, Sodankylä FIN-99600, Finland
8
NASA Ames Research Center, Atmospheric Science Branch, Mail Stop 245-5, Moffett Field, CA 94035, USA
9
Bay Area Environmental Research Institute, 625 2nd St., Suite 209, Petaluma, CA 94952, USA
10
Earth Observation Research Center (EORC), Japan Aerospace Exploration Agency (JAXA), 2-1-1 Sengen, Tsukuba-city, Ibaraki 305-8505, Japan
11
National Institute of Water and Atmospheric Research (NIWA), Private bag 50061, Omakau 9352, New Zealand
12
Karlsruhe Institute of Technology, IMK-IFU, Kreuzeckbahnstr. 19, Garmisch-Partenkirchen 82467, Germany
13
California Institute of Technology, MC 131-24, 1200 E. California Blvd., Pasadena, CA 91125, USA
14
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
Current address: Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada
*
Author to whom correspondence should be addressed.
Academic Editors: Alfredo R. Huete and Prasad S. Thenkabail
Received: 10 January 2016 / Revised: 26 April 2016 / Accepted: 4 May 2016 / Published: 17 May 2016
View Full-Text   |   Download PDF [2676 KB, uploaded 30 November 2016]   |  

Abstract

Understanding the atmospheric distribution of water (H 2 O) is crucial for global warming studies and climate change mitigation. In this context, reliable satellite data are extremely valuable for their global and continuous coverage, once their quality has been assessed. Short-wavelength infrared spectra are acquired by the Thermal And Near-infrared Sensor for carbon Observation-Fourier Transform Spectrometer (TANSO-FTS) aboard the Greenhouse gases Observing Satellite (GOSAT). From these, column-averaged dry-air mole fractions of carbon dioxide, methane and water vapor (XH 2 O) have been retrieved at the National Institute for Environmental Studies (NIES, Japan) and are available as a Level 2 research product. We compare the NIES XH 2 O data, Version 02.21, with retrievals from the ground-based Total Carbon Column Observing Network (TCCON, Version GGG2014). The datasets are in good overall agreement, with GOSAT data showing a slight global low bias of −3.1% ± 24.0%, good consistency over different locations (station bias of −1.53% ± 10.35%) and reasonable correlation with TCCON (R = 0.89). We identified two potential sources of discrepancy between the NIES and TCCON retrievals over land. While the TCCON XH 2 O amounts can reach 6000–7000 ppm when the atmospheric water content is high, the correlated NIES values do not exceed 5500 ppm. This could be due to a dry bias of TANSO-FTS in situations of high humidity and aerosol content. We also determined that the GOSAT-TCCON differences directly depend on the altitude difference between the TANSO-FTS footprint and the TCCON site. Further analysis will account for these biases, but the NIES V02.21 XH 2 O product, after public release, can already be useful for water cycle studies. View Full-Text
Keywords: GOSAT; H2O; SWIR; validation GOSAT; H2O; SWIR; validation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dupuy, E.; Morino, I.; Deutscher, N.M.; Yoshida, Y.; Uchino, O.; Connor, B.J.; De Mazière, M.; Griffith, D.W.T.; Hase, F.; Heikkinen, P.; Hillyard, P.W.; Iraci, L.T.; Kawakami, S.; Kivi, R.; Matsunaga, T.; Notholt, J.; Petri, C.; Podolske, J.R.; Pollard, D.F.; Rettinger, M.; Roehl, C.M.; Sherlock, V.; Sussmann, R.; Toon, G.C.; Velazco, V.A.; Warneke, T.; Wennberg, P.O.; Wunch, D.; Yokota, T. Comparison of XH2O Retrieved from GOSAT Short-Wavelength Infrared Spectra with Observations from the TCCON Network. Remote Sens. 2016, 8, 414.

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