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. doi:10.5194/amt-5-1809-2012. 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 | ||||||||||
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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. | ||||||||||
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Issue or Number: | 7 | ||||||||||
DOI: | 10.5194/amt-5-1809-2012 | ||||||||||
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: | 10 Nov 2021 21:11 |
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