H
Hirofumi Ohyama
Researcher at National Institute for Environmental Studies
Publications - 57
Citations - 1036
Hirofumi Ohyama is an academic researcher from National Institute for Environmental Studies. The author has contributed to research in topics: Total Carbon Column Observing Network & Environmental science. The author has an hindex of 12, co-authored 45 publications receiving 652 citations. Previous affiliations of Hirofumi Ohyama include Japan Aerospace Exploration Agency & Kobe University.
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Journal ArticleDOI
Estimating global and North American methane emissions with high spatial resolution using GOSAT satellite data
Alexander J. Turner,Daniel J. Jacob,K. Wecht,Joannes D. Maasakkers,Elizabeth W. Lundgren,Arlyn E. Andrews,Sébastien C. Biraud,Hartmut Boesch,Kevin W. Bowman,Nicholas M. Deutscher,Nicholas M. Deutscher,Manvendra K. Dubey,David W. T. Griffith,Frank Hase,Akihiko Kuze,Justus Notholt,Hirofumi Ohyama,Hirofumi Ohyama,Robert J. Parker,Vivienne H. Payne,Ralf Sussmann,Colm Sweeney,Colm Sweeney,Voltaire A. Velazco,Thorsten Warneke,Paul O. Wennberg,Debra Wunch +26 more
TL;DR: In this article, the authors use space-borne methane observations from the Greenhouse Gases Observing SATellite (GOSAT) to estimate global and North American methane emissions with up to 50 km × 50 km spatial resolution, respectively.
Journal ArticleDOI
Improved retrievals of carbon dioxide from Orbiting Carbon Observatory-2 with the version 8 ACOS algorithm
Christopher W. O'Dell,Annmarie Eldering,Paul O. Wennberg,David Crisp,Michael R. Gunson,Brendan Fisher,Christian Frankenberg,Matthäus Kiel,Hannakaisa Lindqvist,Lukas Mandrake,Aronne Merrelli,Vijay Natraj,R. R. Nelson,Gregory B. Osterman,Vivienne H. Payne,Thomas E. Taylor,Debra Wunch,Brian J. Drouin,Fabiano Oyafuso,Albert Y. Chang,James McDuffie,Mike Smyth,David Baker,Sourish Basu,Sourish Basu,Frédéric Chevallier,Sean Crowell,Liang Feng,Paul I. Palmer,M. K. Dubey,Omaira García,David W. T. Griffith,Frank Hase,Laura T. Iraci,Rigel Kivi,Isamu Morino,Justus Notholt,Hirofumi Ohyama,Christof Petri,Coleen M. Roehl,Mahesh Kumar Sha,Kimberly Strong,Ralf Sussmann,Yao Té,Osamu Uchino,Voltaire A. Velazco +45 more
TL;DR: The Atmospheric Carbon Observations from Space (ACOS) algorithm has been applied to greenhouse gas observations from the GOSAT satellite since 2009, with modifications necessary for OCO-2.
Journal ArticleDOI
Building the COllaborative Carbon Column Observing Network (COCCON): long-term stability and ensemble performance of the EM27/SUN Fourier transform spectrometer
Matthias Frey,Mahesh Kumar Sha,Frank Hase,Matthäus Kiel,Matthäus Kiel,Thomas Blumenstock,Roland Harig,Gregor Surawicz,Nicholas M. Deutscher,Kei Shiomi,J. E. Franklin,Hartmut Bösch,Jia Chen,Michel Grutter,Hirofumi Ohyama,Youwen Sun,André Butz,André Butz,Gizaw Mengistu Tsidu,Dragos Ene,Debra Wunch,Zhensong Cao,Omaira García,Michel Ramonet,Felix Vogel,Johannes Orphal +25 more
TL;DR: In this paper, the long-term performance of a mobile, solar absorption Bruker EM27/SUN spectrometer, used for greenhouse gas observations, is checked with respect to a co-located reference Bruker IFS 125HR spectrometers, which is part of the Total Carbon Column Observing Network.
Journal ArticleDOI
A decade of GOSAT Proxy satellite CH 4 observations
Robert J. Parker,Alex Webb,Hartmut Boesch,Peter Somkuti,Rocio Barrio Guillo,Antonio Di Noia,Nikoleta Kalaitzi,Jasdeep Anand,Peter Bergamaschi,Frédéric Chevallier,Paul I. Palmer,Liang Feng,Nicholas M. Deutscher,Dietrich G. Feist,Dietrich G. Feist,Dietrich G. Feist,David W. T. Griffith,Frank Hase,Rigel Kivi,Isamu Morino,Justus Notholt,Young-Suk Oh,Hirofumi Ohyama,Christof Petri,David F. Pollard,Coleen M. Roehl,Mahesh Kumar Sha,Kei Shiomi,Kimberly Strong,Ralf Sussmann,Yao Té,Voltaire A. Velazco,Thorsten Warneke,Paul O. Wennberg,Debra Wunch +34 more
TL;DR: Parker and Boesch as mentioned in this paper presented the latest version (v9.0) of the University of Leicester GOSAT Proxy XCH4 dataset and found that 7.3 million of these are sufficiently cloud-free (37.6%) to process further and ultimately obtain 4.6 million (23.5%) high-quality XCH 4 observations.
Journal ArticleDOI
Validation of methane and carbon monoxide from Sentinel-5 Precursor using TCCON and NDACC-IRWG stations
Mahesh Kumar Sha,Bavo Langerock,Jean-Francois Blavier,Thomas Blumenstock,Tobias Borsdorff,Matthias Buschmann,Angelika Dehn,Martine De Mazière,Nicholas M. Deutscher,Dietrich G. Feist,Dietrich G. Feist,Dietrich G. Feist,Omaira García,David W. T. Griffith,Michel Grutter,James W. Hannigan,Frank Hase,Pauli Heikkinen,Christian Hermans,Laura T. Iraci,Pascal Jeseck,Nicholas B. Jones,Rigel Kivi,Nicolas Kumps,Jochen Landgraf,Alba Lorente,Emmanuel Mahieu,Maria Makarova,Johan Mellqvist,Jean-Marc Metzger,Isamu Morino,Tomoo Nagahama,Justus Notholt,Hirofumi Ohyama,Ivan Ortega,Mathias Palm,Christof Petri,David F. Pollard,Markus Rettinger,John Robinson,Sébastien Roche,Coleen M. Roehl,Amelie N. Röhling,Constantina Rousogenous,Matthias Schneider,Kei Shiomi,Dan Smale,Wolfgang Stremme,Kimberly Strong,Ralf Sussmann,Yao Té,Osamu Uchino,Voltaire A. Velazco,Corinne Vigouroux,Mihalis Vrekoussis,Mihalis Vrekoussis,Pucai Wang,Thorsten Warneke,Tyler Wizenberg,Debra Wunch,Shoma Yamanouchi,Yang Yang,Yang Yang,Yang Yang,Minqiang Zhou +64 more
TL;DR: In this article, the Sentinel-5 Precursor (S5P) data were validated using global Total Carbon Column Observing Network (TCCON) and Infrared Working Group of the Network for the Detection of Atmospheric Composition Change (NDACC-IRWG) network data, accounting for a prior alignment and smoothing uncertainties in the validation.