A method for evaluating bias in global measurements of CO 2 total columns from space
Debra Wunch,Paul O. Wennberg,G. C. Toon,B. J. Connor,Brendan Fisher,Gregory B. Osterman,Christian Frankenberg,Lukas Mandrake,Christopher W. O'Dell,P. Ahonen,Sébastien C. Biraud,Rebecca Castano,Noel A Cressie,David Crisp,Nicholas M. Deutscher,Nicholas M. Deutscher,Annmarie Eldering,M. L. Fisher,David W. T. Griffith,M. R. Gunson,Pauli Heikkinen,Gretchen Keppel-Aleks,Esko Kyrö,Rodica Lindenmaier,R. Macatangay,J. Mendonca,J. Messerschmidt,Charles E. Miller,Isamu Morino,Justus Notholt,Fabiano Oyafuso,Markus Rettinger,John Robinson,Coleen M. Roehl,Ross J. Salawitch,Vanessa Sherlock,Kim Strong,Ralf Sussmann,Tomoaki Tanaka,Tomoaki Tanaka,David R. Thompson,Osamu Uchino,Thorsten Warneke,S. C. Wofsy +43 more
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In this paper, a method of evaluating systematic errors in measurements of total column dry-air mole fractions of CO2 (XCO2) from space is described, and applied to the v2.8 Atmospheric CO2 Observations from Space retrievals of the Greenhouse Gases Observing Satellite (ACOS-GOSAT) measurements over land.Abstract:
. We describe a method of evaluating systematic errors in measurements of total column dry-air mole fractions of CO2 (XCO2) from space, and we illustrate the method by applying it to the v2.8 Atmospheric CO2 Observations from Space retrievals of the Greenhouse Gases Observing Satellite (ACOS-GOSAT) measurements over land. The approach exploits the lack of large gradients in XCO2 south of 25° S to identify large-scale offsets and other biases in the ACOS-GOSAT data with several retrieval parameters and errors in instrument calibration. We demonstrate the effectiveness of the method by comparing the ACOS-GOSAT data in the Northern Hemisphere with ground truth provided by the Total Carbon Column Observing Network (TCCON). We use the observed correlation between free-tropospheric potential temperature and XCO2 in the Northern Hemisphere to define a dynamically informed coincidence criterion between the ground-based TCCON measurements and the ACOS-GOSAT measurements. We illustrate that this approach provides larger sample sizes, hence giving a more robust comparison than one that simply uses time, latitude and longitude criteria. Our results show that the agreement with the TCCON data improves after accounting for the systematic errors, but that extrapolation to conditions found outside the region south of 25° S may be problematic (e.g., high airmasses, large surface pressure biases, M-gain, measurements made over ocean). A preliminary evaluation of the improved v2.9 ACOS-GOSAT data is also discussed.read more
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Journal ArticleDOI
The ACOS CO 2 retrieval algorithm – Part 1: Description and validation against synthetic observations
Christopher W. O'Dell,B. J. Connor,Hartmut Bösch,D. M. O'Brien,Christian Frankenberg,Rebecca Castano,M. Christi,D. Eldering,Brendan Fisher,M. R. Gunson,James McDuffie,Charles E. Miller,Vijay Natraj,Fabiano Oyafuso,I. Polonsky,Mike Smyth,Thomas E. Taylor,G. C. Toon,Paul O. Wennberg,Debra Wunch +19 more
TL;DR: In this paper, the authors describe the NASA Atmospheric CO2 Observations from Space (ACOS) XCO2 retrieval algorithm and its performance on highly realistic, simulated observations, and evaluate retrieval errors in the face of realistic clouds and aerosols, polarized non-Lambertian surfaces, imperfect meteorology, and uncorrelated instrument noise.
Journal ArticleDOI
Improvement of the retrieval algorithm for GOSAT SWIR XCO2 and XCH4 and their validation using TCCON data
Yukio Yoshida,Nobuyuki Kikuchi,Isamu Morino,Osamu Uchino,Sergey Oshchepkov,Andrey Bril,Tazu Saeki,Nick Schutgens,Nick Schutgens,Geoffrey C. Toon,Debra Wunch,Coleen M. Roehl,Paul O. Wennberg,David W. T. Griffith,Nicholas M. Deutscher,Nicholas M. Deutscher,Thorsten Warneke,Justus Notholt,John Robinson,Vanessa Sherlock,B. J. Connor,Markus Rettinger,Ralf Sussmann,P. Ahonen,Pauli Heikkinen,Esko Kyrö,J. Mendonca,Kimberly Strong,Frank Hase,S. Dohe,Tatsuya Yokota +30 more
TL;DR: In this article, column-averaged dry-air mole fractions of carbon dioxide and methane (XCO2 and XCH4) have been retrieved from Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed (SWIR) observations and released as a SWIR L2 product from the National Institute for Environmental Studies (NIES).
Journal ArticleDOI
Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) X CO 2 measurements with TCCON
Debra Wunch,Debra Wunch,Paul O. Wennberg,Gregory B. Osterman,Gregory B. Osterman,Brendan Fisher,Brendan Fisher,B. J. Naylor,B. J. Naylor,Coleen M. Roehl,Christopher W. O'Dell,Lukas Mandrake,Lukas Mandrake,Camille Viatte,Matthäus Kiel,Matthäus Kiel,David W. T. Griffith,Nicholas M. Deutscher,Nicholas M. Deutscher,Voltaire A. Velazco,Justus Notholt,Thorsten Warneke,Christof Petri,Martine De Mazière,Mahesh Kumar Sha,Ralf Sussmann,Markus Rettinger,David F. Pollard,John Robinson,Isamu Morino,Osamu Uchino,Frank Hase,Thomas Blumenstock,Dietrich G. Feist,Sabrina G. Arnold,Kimberly Strong,J. Mendonca,Rigel Kivi,Pauli Heikkinen,Laura T. Iraci,James R. Podolske,Patrick W. Hillyard,Shuji Kawakami,Manvendra K. Dubey,H. A. Parker,Eliezer Sepúlveda,Omaira García,Yao Té,P. Jeseck,Michael R. Gunson,Michael R. Gunson,David Crisp,David Crisp,Annmarie Eldering,Annmarie Eldering +54 more
TL;DR: In this article, the first major release of the OCO2 retrieval algorithm (B7r) and X_(CO2) from OCO-2's primary ground-based validation network: the Total Carbon Column Observing Network (TCCON) were compared.
Journal ArticleDOI
Remote sensing of the terrestrial carbon cycle: A review of advances over 50 years
Jingfeng Xiao,Frédéric Chevallier,Cécile Gomez,Luis Guanter,Jeffrey A. Hicke,Alfredo Huete,Kazuhito Ichii,Wenjian Ni,Yong Pang,Abdullah F. Rahman,Guoqing Sun,Wenping Yuan,Li Zhang,Xiaoyang Zhang +13 more
TL;DR: A review of the advances in remote sensing of the terrestrial carbon cycle from the early 1970s to present can be found in this paper, where the authors provide a comprehensive and insightful review.
Journal ArticleDOI
The ACOS CO 2 retrieval algorithm – Part II: Global X CO 2 data characterization
David Crisp,Brendan Fisher,Christopher W. O'Dell,Christian Frankenberg,Ralph R. Basilio,Hartmut Bösch,Linda R. Brown,Rebecca Castano,B. J. Connor,Nicholas M. Deutscher,Nicholas M. Deutscher,Annmarie Eldering,David W. T. Griffith,M. R. Gunson,Akihiko Kuze,Lukas Mandrake,James McDuffie,J. Messerschmidt,Charles E. Miller,Isamu Morino,Vijay Natraj,Justus Notholt,D. M. O'Brien,Fabiano Oyafuso,I. Polonsky,John Robinson,Ross J. Salawitch,Vanessa Sherlock,Mike Smyth,Hiroshi Suto,Thomas E. Taylor,David R. Thompson,Paul O. Wennberg,Debra Wunch,Yuk L. Yung +34 more
TL;DR: This article reported preliminary estimates of column averaged carbon dioxide (CO2) dry air mole fraction, XCO2, retrieved from spectra recorded over land by the Greenhouse gases Observing Satellite, GOSAT (nicknamed "Ibuki"), using retrieval methods originally developed for the NASA Orbiting Carbon Observatory (OCO) mission.
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TL;DR: An estimate of net CO2 exchange between the terrestrial biosphere and the atmosphere across North America for every week in the period 2000 through 2005 is presented, derived from a set of 28,000 CO2 mole fraction observations in the global atmosphere that are fed into a state-of-the-art data assimilation system for CO2 called CarbonTracker.
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