CaltechAUTHORS
  A Caltech Library Service

Effects of atmospheric light scattering on spectroscopic observations of greenhouse gases from space. Part 2: Algorithm intercomparison in the GOSAT data processing for CO_2 retrievals over TCCON sites

Oshchepkov, Sergey and Wennberg, Paul O. and Wunch, Debra (2013) Effects of atmospheric light scattering on spectroscopic observations of greenhouse gases from space. Part 2: Algorithm intercomparison in the GOSAT data processing for CO_2 retrievals over TCCON sites. Journal of Geophysical Research. Atmospheres, 118 (3). pp. 1493-1512. ISSN 2169-897X. doi:10.1002/jgrd.50146. https://resolver.caltech.edu/CaltechAUTHORS:20181130-101030855

[img] PDF - Published Version
See Usage Policy.

5MB

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20181130-101030855

Abstract

This report is the second in a series of companion papers describing the effects of atmospheric light scattering in observations of atmospheric carbon dioxide (CO_2) by the Greenhouse gases Observing SATellite (GOSAT), in orbit since 23 January 2009. Here we summarize the retrievals from six previously published algorithms; retrieving column‐averaged dry air mole fractions of CO_2 (X_(CO2)) during 22 months of operation of GOSAT from June 2009. First, we compare data products from each algorithm with ground‐based remote sensing observations by Total Carbon Column Observing Network (TCCON). Our GOSAT‐TCCON coincidence criteria select satellite observations within a 5° radius of 11 TCCON sites. We have compared the GOSAT‐TCCON X_(CO2) regression slope, standard deviation, correlation and determination coefficients, and global and station‐to‐station biases. The best agreements with TCCON measurements were detected for NIES 02.xx and RemoTeC. Next, the impact of atmospheric light scattering on X_(CO2) retrievals was estimated for each data product using scan by scan retrievals of light path modification with the photon path length probability density function (PPDF) method. After a cloud pre‐filtering test, approximately 25% of GOSAT soundings processed by NIES 02.xx, ACOS B2.9, and UoL‐FP: 3G and 35% processed by RemoTeC were found to be contaminated by atmospheric light scattering. This study suggests that NIES 02.xx and ACOS B2.9 algorithms tend to overestimate aerosol amounts over bright surfaces, resulting in an underestimation of X_(CO2) for GOSAT observations. Cross‐comparison between algorithms shows that ACOS B2.9 agrees best with NIES 02.xx and UoL‐FP: 3G while RemoTeC X_(CO2) retrievals are in a best agreement with NIES PPDF‐D.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/jgrd.50146DOIArticle
ORCID:
AuthorORCID
Wennberg, Paul O.0000-0002-6126-3854
Wunch, Debra0000-0002-4924-0377
Additional Information:© 2013 American Geophysical Union. Received 28 November 2012; revised 9 September 2012; accepted 28 December 2012; published 11 February 2013. GOSAT is a joint effort of the Japan Aerospace Exploration Agency (JAXA), the National Institute for Environmental Studies (NIES), and the Ministry of the Environment (MOE), Japan. Part of this work on ACOS B2.9 was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. GOSAT spectra were kindly provided to the California Institute of Technology through a memorandum of understanding between JAXA and NASA. U.S. funding for TCCON is provided by NASA's Terrestrial Ecology Program (grant number NNX11AG01G), the Orbiting Carbon Observatory Program, the Atmospheric CO_2 Observations from Space (ACOS) Program, and the Department of Energy/Atmospheric Radiation Measurement (DOE/ARM) Program. The Darwin TCCON site was built at Caltech with funding from the OCO project and is operated by the University of Wollongong, with travel funds for maintenance and equipment costs funded by the OCO‐2 project. We acknowledge funding to support Darwin and Wollongong from the Australian Research Council, Projects LE0668470, DP0879468, DP110103118, and LP0562346. Lauder TCCON measurements are funded by New Zealand Foundation of Research Science and Technology contracts C01X0204 and CO1X0406. We acknowledge financial support of the Białystok and Orléans TCCON sites from the Senate of Bremen and EU projects IMECC, GEOMON and InGOS as well as maintenance and logistical work provided by AeroMeteo Service (Białystok) and the RAMCES team at LSCE (Gif‐sur‐Yvette, France) and additional operational funding from the NIES GOSAT project. The Garmisch TCCON team acknowledges funding by the EC‐INGOS project. Development of RemoTeC was partly funded by ESA through the GHG‐CCI project (S. Guerlet) and by Deutsche Forschungsgemeinschaft (DFG) through grant BU2599/1‐1 (A. Butz). The JRA‐25/JCDAS data sets used for atmospheric transport modeling were provided by the cooperative, long‐term reanalysis project by the Japan Meteorological Agency (JMA) and Central Research Institute of Electric Power Industry (CRIEPI). The authors thank Dr. Sasano, Director of the Center for Global Environmental Research at the NIES, the members of the NIES GOSAT and NASA ACOS projects.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
NASANNX11AG01G
Department of Energy (DOE)UNSPECIFIED
Orbiting Carbon Observatory ProgramUNSPECIFIED
Australian Research CouncilLE0668470
Australian Research CouncilDP0879468
Australian Research CouncilDP110103118
Australian Research CouncilLP0562346
New Zealand Foundation of Research Science and TechnologyC01X0204
New Zealand Foundation for Research Science and TechnologyCO1X0406
Senate of BremenUNSPECIFIED
European UnionIMECC
European UnionGEOMON
European UnionInGOS
National Institute for Environmental Studies (Japan)UNSPECIFIED
European Space Agency (ESA)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)BU2599/1‐1
Subject Keywords:GOSAT algorithms
Issue or Number:3
DOI:10.1002/jgrd.50146
Record Number:CaltechAUTHORS:20181130-101030855
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181130-101030855
Official Citation:Oshchepkov, S., et al. (2013), Effects of atmospheric light scattering on spectroscopic observations of greenhouse gases from space. Part 2: Algorithm intercomparison in the GOSAT data processing for CO2 retrievals over TCCON sites, J. Geophys. Res. Atmos., 118, 1493–1512, doi: 10.1002/jgrd.50146
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91362
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Nov 2018 18:27
Last Modified:16 Nov 2021 03:40

Repository Staff Only: item control page