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Aerosol information content analysis of multi-angle high spectral resolution measurements and its benefit for high accuracy greenhouse gas retrievals

Frankenberg, C. and Hasekamp, O. and O'Dell, C. and Sanghavi, S. and Butz, A. and Worden, J (2012) Aerosol information content analysis of multi-angle high spectral resolution measurements and its benefit for high accuracy greenhouse gas retrievals. Atmospheric Measurement Techniques, 5 (7). pp. 1809-1821. ISSN 1867-1381. https://resolver.caltech.edu/CaltechAUTHORS:20150508-133713476

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Abstract

New generations of space-borne spectrometers for the retrieval of atmospheric abundances of greenhouse gases require unprecedented accuracies as atmospheric variability of long-lived gases is very low. These instruments, such as GOSAT and OCO-2, typically use a high spectral resolution oxygen channel (O_2 A-band) in addition to CO_2 and CH_4 channels to discriminate changes in the photon path-length distribution from actual trace gas amount changes. Inaccurate knowledge of the photon path-length distribution, determined by scatterers in the atmosphere, is the prime source of systematic biases in the retrieval. In this paper, we investigate the combined aerosol and greenhouse gas retrieval using multiple satellite viewing angles simultaneously. We find that this method, hitherto only applied in multi-angle imagery such as from POLDER or MISR, greatly enhances the ability to retrieve aerosol properties by 2–3 degrees of freedom. We find that the improved capability to retrieve aerosol parameters significantly reduces interference errors introduced into retrieved CO_2 and CH_4 total column averages. Instead of focussing solely on improvements in spectral and spatial resolution, signal-to-noise ratios or sampling frequency, multiple angles reduce uncertainty in space based greenhouse gas retrievals more effectively and provide a new potential for dedicated aerosols retrievals.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.5194/amt-5-1809-2012 DOIArticle
http://www.atmos-meas-tech.net/5/1809/2012/amt-5-1809-2012.htmlPublisherArticle
ORCID:
AuthorORCID
Frankenberg, C.0000-0002-0546-5857
Additional Information:© 2012 The Authors. CC Attribution 3.0 License. Published by Copernicus Publications on behalf of the European Geosciences Union. Received: 1 April 2012 – Published in Atmos. Meas. Tech. Discuss.: 16 April 2012. Revised: 29 June 2012 – Accepted: 3 July 2012 – Published: 27 July 2012. 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. All rights reserved. A. B. is supported by Deutsche Forschungsgemeinschaft (DFG) through the Emmy-Noether grant RemoteC, BU2599/1-1.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)BU2599/1-1
Issue or Number:7
Record Number:CaltechAUTHORS:20150508-133713476
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150508-133713476
Official Citation:Frankenberg, C., Hasekamp, O., O'Dell, C., Sanghavi, S., Butz, A., and Worden, J.: Aerosol information content analysis of multi-angle high spectral resolution measurements and its benefit for high accuracy greenhouse gas retrievals, Atmos. Meas. Tech., 5, 1809-1821, doi:10.5194/amt-5-1809-2012, 2012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57383
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 May 2015 21:23
Last Modified:03 Oct 2019 08:24

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