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Title: Assessment of errors and biases in retrievals of X CO2, X CH4, X CO, and X N2O from a 0.5 cm –1 resolution solar-viewing spectrometer

Abstract

Bruker™ EM27/SUN instruments are commercial mobile solar-viewing near-IR spectrometers. They show promise for expanding the global density of atmospheric column measurements of greenhouse gases and are being marketed for such applications. They have been shown to measure the same variations of atmospheric gases within a day as the high-resolution spectrometers of the Total Carbon Column Observing Network (TCCON). However, there is little known about the long-term precision and uncertainty budgets of EM27/SUN measurements. In this study, which includes a comparison of 186 measurement days spanning 11 months, we note that atmospheric variations of X gas within a single day are well captured by these low-resolution instruments, but over several months, the measurements drift noticeably. We present comparisons between EM27/SUN instruments and the TCCON using GGG as the retrieval algorithm. In addition, we perform several tests to evaluate the robustness of the performance and determine the largest sources of errors from these spectrometers. We include comparisons of X CO2, X CH4, X CO, and X N2O. Specifically we note EM27/SUN biases for January 2015 of 0.03, 0.75, –0.12, and 2.43 % for X CO2, X CH4, X CO, and X N2O respectively, with 1 σ running precisions of 0.08 and 0.06more » % for X CO2 and X CH4 from measurements in Pasadena. We also identify significant error caused by nonlinear sensitivity when using an extended spectral range detector used to measure CO and N 2O.« less

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1281329
Grant/Contract Number:
20110081DR
Resource Type:
Journal Article: Published Article
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Name: Atmospheric Measurement Techniques (Online); Journal Volume: 9; Journal Issue: 8; Related Information: CHORUS Timestamp: 2016-08-03 09:46:12; Journal ID: ISSN 1867-8548
Publisher:
Copernicus GmbH
Country of Publication:
Germany
Language:
English

Citation Formats

Hedelius, Jacob K., Viatte, Camille, Wunch, Debra, Roehl, Coleen M., Toon, Geoffrey C., Chen, Jia, Jones, Taylor, Wofsy, Steven C., Franklin, Jonathan E., Parker, Harrison, Dubey, Manvendra K., and Wennberg, Paul O.. Assessment of errors and biases in retrievals of XCO2, XCH4, XCO, and XN2O from a 0.5 cm–1 resolution solar-viewing spectrometer. Germany: N. p., 2016. Web. doi:10.5194/amt-9-3527-2016.
Hedelius, Jacob K., Viatte, Camille, Wunch, Debra, Roehl, Coleen M., Toon, Geoffrey C., Chen, Jia, Jones, Taylor, Wofsy, Steven C., Franklin, Jonathan E., Parker, Harrison, Dubey, Manvendra K., & Wennberg, Paul O.. Assessment of errors and biases in retrievals of XCO2, XCH4, XCO, and XN2O from a 0.5 cm–1 resolution solar-viewing spectrometer. Germany. doi:10.5194/amt-9-3527-2016.
Hedelius, Jacob K., Viatte, Camille, Wunch, Debra, Roehl, Coleen M., Toon, Geoffrey C., Chen, Jia, Jones, Taylor, Wofsy, Steven C., Franklin, Jonathan E., Parker, Harrison, Dubey, Manvendra K., and Wennberg, Paul O.. Wed . "Assessment of errors and biases in retrievals of XCO2, XCH4, XCO, and XN2O from a 0.5 cm–1 resolution solar-viewing spectrometer". Germany. doi:10.5194/amt-9-3527-2016.
@article{osti_1281329,
title = {Assessment of errors and biases in retrievals of XCO2, XCH4, XCO, and XN2O from a 0.5 cm–1 resolution solar-viewing spectrometer},
author = {Hedelius, Jacob K. and Viatte, Camille and Wunch, Debra and Roehl, Coleen M. and Toon, Geoffrey C. and Chen, Jia and Jones, Taylor and Wofsy, Steven C. and Franklin, Jonathan E. and Parker, Harrison and Dubey, Manvendra K. and Wennberg, Paul O.},
abstractNote = {Bruker™ EM27/SUN instruments are commercial mobile solar-viewing near-IR spectrometers. They show promise for expanding the global density of atmospheric column measurements of greenhouse gases and are being marketed for such applications. They have been shown to measure the same variations of atmospheric gases within a day as the high-resolution spectrometers of the Total Carbon Column Observing Network (TCCON). However, there is little known about the long-term precision and uncertainty budgets of EM27/SUN measurements. In this study, which includes a comparison of 186 measurement days spanning 11 months, we note that atmospheric variations of Xgas within a single day are well captured by these low-resolution instruments, but over several months, the measurements drift noticeably. We present comparisons between EM27/SUN instruments and the TCCON using GGG as the retrieval algorithm. In addition, we perform several tests to evaluate the robustness of the performance and determine the largest sources of errors from these spectrometers. We include comparisons of XCO2, XCH4, XCO, and XN2O. Specifically we note EM27/SUN biases for January 2015 of 0.03, 0.75, –0.12, and 2.43 % for XCO2, XCH4, XCO, and XN2O respectively, with 1σ running precisions of 0.08 and 0.06 % for XCO2 and XCH4 from measurements in Pasadena. We also identify significant error caused by nonlinear sensitivity when using an extended spectral range detector used to measure CO and N2O.},
doi = {10.5194/amt-9-3527-2016},
journal = {Atmospheric Measurement Techniques (Online)},
number = 8,
volume = 9,
place = {Germany},
year = {Wed Aug 03 00:00:00 EDT 2016},
month = {Wed Aug 03 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.5194/amt-9-3527-2016

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Cited by: 4works
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