Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT Spectra
<b> </b>The proxy method, using the ratio of total column CH<sub>4</sub> to CO<sub>2</sub> to reduce the effects of common biases, has been used to retrieve column-averaged dry-air mole fraction of CH<sub>4</sub> from satellite data. The present study...
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Language: | English |
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MDPI AG
2020-09-01
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Series: | Remote Sensing |
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Online Access: | https://www.mdpi.com/2072-4292/12/19/3155 |
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record_format |
Article |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Haruki Oshio Yukio Yoshida Tsuneo Matsunaga Nicholas M. Deutscher Manvendra Dubey David W.T. Griffith Frank Hase Laura T. Iraci Rigel Kivi Cheng Liu Isamu Morino Justus Notholt Young-Suk Oh Hirofumi Ohyama Christof Petri David F. Pollard Coleen Roehl Kei Shiomi Ralf Sussmann Yao Té Voltaire A. Velazco Thorsten Warneke Debra Wunch |
spellingShingle |
Haruki Oshio Yukio Yoshida Tsuneo Matsunaga Nicholas M. Deutscher Manvendra Dubey David W.T. Griffith Frank Hase Laura T. Iraci Rigel Kivi Cheng Liu Isamu Morino Justus Notholt Young-Suk Oh Hirofumi Ohyama Christof Petri David F. Pollard Coleen Roehl Kei Shiomi Ralf Sussmann Yao Té Voltaire A. Velazco Thorsten Warneke Debra Wunch Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT Spectra Remote Sensing methane proxy method GOSAT TCCON |
author_facet |
Haruki Oshio Yukio Yoshida Tsuneo Matsunaga Nicholas M. Deutscher Manvendra Dubey David W.T. Griffith Frank Hase Laura T. Iraci Rigel Kivi Cheng Liu Isamu Morino Justus Notholt Young-Suk Oh Hirofumi Ohyama Christof Petri David F. Pollard Coleen Roehl Kei Shiomi Ralf Sussmann Yao Té Voltaire A. Velazco Thorsten Warneke Debra Wunch |
author_sort |
Haruki Oshio |
title |
Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT Spectra |
title_short |
Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT Spectra |
title_full |
Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT Spectra |
title_fullStr |
Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT Spectra |
title_full_unstemmed |
Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT Spectra |
title_sort |
bias correction of the ratio of total column ch<sub>4</sub> to co<sub>2</sub> retrieved from gosat spectra |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2020-09-01 |
description |
<b> </b>The proxy method, using the ratio of total column CH<sub>4</sub> to CO<sub>2</sub> to reduce the effects of common biases, has been used to retrieve column-averaged dry-air mole fraction of CH<sub>4</sub> from satellite data. The present study characterizes the remaining scattering effects in the CH<sub>4</sub>/CO<sub>2</sub> ratio component of the Greenhouse gases Observing SATellite (GOSAT) retrieval and uses them for bias correction. The variation of bias between the GOSAT and Total Carbon Column Observing Network (TCCON) ratio component with GOSAT data-derived variables was investigated. Then, it was revealed that the variability of the bias could be reduced by using four variables for the bias correction—namely, airmass, 2 μm band radiance normalized with its noise level, the ratio between the partial column-averaged dry-air mole fraction of CH<sub>4</sub> for the lower atmosphere and that for the upper atmosphere, and the difference in surface albedo between the CH<sub>4</sub> and CO<sub>2</sub> bands. The ratio of partial column CH<sub>4</sub> reduced the dependence of bias on the cloud fraction and the difference between hemispheres. In addition to the reduction of bias (from 0.43% to 0%), the precision (standard deviation of the difference between GOSAT and TCCON) was reduced from 0.61% to 0.55% by the correction. The bias and its temporal variation were reduced for each site: the mean and standard deviation of the mean bias for individual seasons were within 0.2% for most of the sites. |
topic |
methane proxy method GOSAT TCCON |
url |
https://www.mdpi.com/2072-4292/12/19/3155 |
work_keys_str_mv |
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doaj-add5536135e84dfc873f9097d6ee39872020-11-25T03:32:02ZengMDPI AGRemote Sensing2072-42922020-09-01123155315510.3390/rs12193155Bias Correction of the Ratio of Total Column CH<sub>4</sub> to CO<sub>2</sub> Retrieved from GOSAT SpectraHaruki Oshio0Yukio Yoshida1Tsuneo Matsunaga2Nicholas M. Deutscher3Manvendra Dubey4David W.T. Griffith5Frank Hase6Laura T. Iraci7Rigel Kivi8Cheng Liu9Isamu Morino10Justus Notholt11Young-Suk Oh12Hirofumi Ohyama13Christof Petri14David F. Pollard15Coleen Roehl16Kei Shiomi17Ralf Sussmann18Yao Té19Voltaire A. Velazco20Thorsten Warneke21Debra Wunch22Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, JapanCenter for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, JapanCenter for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, JapanCentre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW 2522, AustraliaLos Alamos National Laboratory, Los Alamos, NM 87545, USACentre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW 2522, AustraliaInstitute of Meteorology and Climate Research IMK-ASF, Karlsruhe Institute of Technology, 76021 Karlsruhe, GermanyAtmospheric Science Branch, NASA Ames Research Center, Moffett Field, CA 94035, USASpace and Earth Observation Centre, Finnish Meteorological Institute, 99600 Sodankylä, FinlandKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaCenter for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, JapanInstitute of Environmental Physics, University of Bremen, 28359 Bremen, GermanyClimate Research Division, National Institute of Meteorological Sciences, Seogwipo, Jeju-do 63568, KoreaCenter for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, JapanInstitute of Environmental Physics, University of Bremen, 28359 Bremen, GermanyNational Institute of Water and Atmospheric Research, Lauder, Omakau 9352, New ZealandDivision of Geology and Planetary Science, California Institute of Technology, Pasadena, CA 91125, USAJapan Aerospace Exploration Agency (JAXA), Tsukuba, Ibaraki 305-8505, JapanInstitute of Meteorology and Climate Research – Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology, 82467 Garmisch-Partenkirchen, GermanyLaboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères (LERMA-IPSL), Sorbonne Université, CNRS, Observatoire de Paris, PSL Université, 75005 Paris, FranceCentre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW 2522, AustraliaInstitute of Environmental Physics, University of Bremen, 28359 Bremen, GermanyDepartment of Physics, University of Toronto, Toronto, ON M5S 1A7, Canada<b> </b>The proxy method, using the ratio of total column CH<sub>4</sub> to CO<sub>2</sub> to reduce the effects of common biases, has been used to retrieve column-averaged dry-air mole fraction of CH<sub>4</sub> from satellite data. The present study characterizes the remaining scattering effects in the CH<sub>4</sub>/CO<sub>2</sub> ratio component of the Greenhouse gases Observing SATellite (GOSAT) retrieval and uses them for bias correction. The variation of bias between the GOSAT and Total Carbon Column Observing Network (TCCON) ratio component with GOSAT data-derived variables was investigated. Then, it was revealed that the variability of the bias could be reduced by using four variables for the bias correction—namely, airmass, 2 μm band radiance normalized with its noise level, the ratio between the partial column-averaged dry-air mole fraction of CH<sub>4</sub> for the lower atmosphere and that for the upper atmosphere, and the difference in surface albedo between the CH<sub>4</sub> and CO<sub>2</sub> bands. The ratio of partial column CH<sub>4</sub> reduced the dependence of bias on the cloud fraction and the difference between hemispheres. In addition to the reduction of bias (from 0.43% to 0%), the precision (standard deviation of the difference between GOSAT and TCCON) was reduced from 0.61% to 0.55% by the correction. The bias and its temporal variation were reduced for each site: the mean and standard deviation of the mean bias for individual seasons were within 0.2% for most of the sites.https://www.mdpi.com/2072-4292/12/19/3155methaneproxy methodGOSATTCCON |