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CH_4, CO, and H_2O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements

Galli, A. and Butz, A. and Scheepmaker, R. A. and Hasekamp, O. and Landgraf, J. and Tol, P. and Wunch, D. and Deutscher, N. M. and Toon, G. C. and Wennberg, P. O. and Griffith, D. W. T. and Aben, I. (2012) CH_4, CO, and H_2O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements. Atmospheric Measurement Techniques, 5 (6). pp. 1387-1398. ISSN 1867-1381. https://resolver.caltech.edu/CaltechAUTHORS:20140716-121007436

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Abstract

The TROPOspheric Monitoring Instrument (TROPOMI) will be part of ESA's TROPOMI will monitor methane and carbon monoxide concentrations in the Earth's atmosphere by measuring spectra of back-scattered sunlight in the short-wave infrared (SWIR). S5P will be the first satellite mission to rely uniquely on the spectral window at 4190–4340 cm^(−1) (2.3 μm) to retrieve CH_4 and CO. In this study, we investigated if the absorption features of the three relevant molecules CH_4, CO, and H_2O are adequately known. To this end, we retrieved total columns of CH_4, CO, and H_2O from absorption spectra measured by two ground-based Fourier transform spectrometers that are part of the Total Carbon Column Observing Network (TCCON). The retrieval results from the 4190–4340 cm^(−1) range at the TROPOMI resolution (0.45 cm^(−1)) were then compared to the CH_4 results obtained from the 6000 cm^(−1) region, and the CO results obtained from the 4190–4340 cm^(−1) region at the higher TCCON resolution (0.02 cm^(−1)). For TROPOMI-like settings, we were able to reproduce the CH_4 columns to an accuracy of 0.3% apart from a constant bias of 1%. The CO retrieval accuracy was, through interference, systematically influenced by the shortcomings of the CH_4 and H_2O spectroscopy. In contrast to CH_4, the CO column error also varied significantly with atmospheric H_2O content. Unaddressed, this would introduce seasonal and latitudinal biases to the CO columns retrieved from TROPOMI measurements. We therefore recommend further effort from the spectroscopic community to be directed at the H_2O and CH_4 spectroscopy in the 4190–4340 cm^(−1) region.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.5194/amt-5-1387-2012DOIArticle
http://www.atmos-meas-tech.net/5/1387/2012/amt-5-1387-2012.htmlPublisherArticle
ORCID:
AuthorORCID
Wunch, D.0000-0002-4924-0377
Wennberg, P. O.0000-0002-6126-3854
Alternate Title:CH4, CO, and H2O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements
Additional Information:© 2012 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. Received: 2 March 2012; Published in Atmos. Meas. Tech.; Discuss.: 13 March 2012; Revised: 18 May 2012; Accepted: 29 May 2012; Published: 19 June 2012. This research was funded by the TROPOMI project through NSO. Research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement no. 218793, and by the Dutch User Support Programme under project GOAO/ 16. A. Butz is supported by Deutsche Forschungsgemeinschaft (DFG) through the Emmy-Noether programme, grant BU2599/1-1 (RemoteC). US funding for TCCON comes from NASA’s Terrestrial Ecology Program, grant number NNX11AG01G, the Orbiting Carbon Observatory Program, the Atmospheric CO2 Observations from Space (ACOS) Program and the 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. ECMWF ERA Interim analyses are provided through http://data-portal.ecmwf.int/data/d/interimdaily/. TM4 modelled CH4 and CO concentration fields have been made available through J. F. Meirink, Royal Netherlands Meteorological Institute (KNMI). The CarbonTracker 2010 results have been provided by NOAA ESRL, Boulder, Colorado, USA from the website at http://carbontracker.noaa.gov.
Funders:
Funding AgencyGrant Number
NSO TROPOMIUNSPECIFIED
European Research Council (ERC)218793
Dutch User Support ProgrammeGO-AO/16
Deutsche Forschungsgemeinschaft (DFG)BU2599/1-1
NASANNX11AG01G
Department of Energy (DOE)UNSPECIFIED
Australian Research CouncilLE0668470
Australian Research CouncilDP087946
Australian Research CouncilDP110103118
Australian Research CouncilLP0562346
Issue or Number:6
Record Number:CaltechAUTHORS:20140716-121007436
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140716-121007436
Official Citation:Galli, A., Butz, A., Scheepmaker, R. A., Hasekamp, O., Landgraf, J., Tol, P., . . . Aben, I. (2012). CH4, CO, and H2O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements. Atmos. Meas. Tech., 5(6), 1387-1398. doi: 10.5194/amt-5-1387-2012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47268
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:16 Jul 2014 20:10
Last Modified:03 Oct 2019 06:51

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