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Spaceborne measurements of atmospheric CO_2 by high-resolution NIR spectrometry of reflected sunlight: An introductory study

Kuang, Zhiming and Margolis, Jack and Toon, Geoffrey and Crisp, David and Yung, Yuk (2002) Spaceborne measurements of atmospheric CO_2 by high-resolution NIR spectrometry of reflected sunlight: An introductory study. Geophysical Research Letters, 29 (15). Art. No. 1716. ISSN 0094-8276. doi:10.1029/2001GL014298. https://resolver.caltech.edu/CaltechAUTHORS:20140723-155213874

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Abstract

We introduce a strategy for measuring the column-averaged CO_2 dry air volume mixing ratio X_(CO_2) from space. It employs high resolution spectra of reflected sunlight taken simultaneously in near-infrared (NIR) CO_2 (1.58-mm and 2.06-mm) and O_2 (0.76-mm) bands. Simulation experiments, show that precisions of ~0.3–2.5 ppmv for X_(CO_2) can be achieved from individual clear sky soundings for a range of atmospheric/surface conditions when the scattering optical depth t_s is less than ~0.3. When averaged over many clear sky soundings, random errors become negligible. This high precision facilitates the identification and correction of systematic errors, which are recognized as the most serious impediment for the satellite X_(CO_2) measurements. We briefly discuss potential sources of systematic errors, and show that some of them may result in geographically varying biases in the measured X_(CO_2). This highlights the importance of careful calibration and validation measurements, designed to identify and eliminate sources of these biases. We conclude that the 3-band, spectrometric approach using NIR reflected sunlight has the potential for highly accurate X_(CO_2) measurements.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2001GL014298DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2001GL014298/abstractPublisherArticle
ORCID:
AuthorORCID
Toon, Geoffrey0000-0003-4174-7541
Crisp, David0000-0002-4573-9998
Yung, Yuk0000-0002-4263-2562
Alternate Title:Spaceborne measurements of atmospheric CO2 by high-resolution NIR spectrometry of reflected sunlight: An introductory study
Additional Information:© 2002 The American Geophysical Union. Received 30 October 2001; Revised 12 February 2002; Accepted 12 February 2002; Published 2 August 2002. We thank two anonymous referees and members of the OCO Team for valuable comments. This research was supported in part by a NASA grant to the Jet Propulsion Laboratory and the Caltech President’s Fund. ZMK and YLY were supported by NASA grants NAG5-7230, NAG1-1806 to Caltech.
Funders:
Funding AgencyGrant Number
Caltech President’s FundUNSPECIFIED
NASANAG5-7230
NASANAG1-1806
Issue or Number:15
DOI:10.1029/2001GL014298
Record Number:CaltechAUTHORS:20140723-155213874
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140723-155213874
Official Citation:Kuang, Z., Margolis, J., Toon, G., Crisp, D., & Yung, Y. (2002). Spaceborne measurements of atmospheric CO2 by high-resolution NIR spectrometry of reflected sunlight: An introductory study. Geophysical Research Letters, 29(15), 11-11-11-14. doi: 10.1029/2001gl014298
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47445
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:24 Jul 2014 17:15
Last Modified:10 Nov 2021 17:39

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