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    Academic Journals

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• Global Carbon Budget 2021.

  Authors:Pierre Friedlingstein, Matthew W. Jones, Michael O'Sullivan, Robbie M. Andrew, Dorothee C. E. Bakker, Judith Hauck, et al.From:Earth System Science Data (Vol. 14, Issue 4) Peer-Reviewed

  Apr. 26, 2022550 words Article Accurate assessment of anthropogenic carbon dioxide (CO.sub.2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate is critical to better understand the global...

• Sensitivity of biomass burning emissions estimates to land surface information.

  Authors:Makoto Saito, Tomohiro Shiraishi, Ryuichi Hirata, Yosuke Niwa, Kazuyuki Saito, Martin Steinbacher, et al.From:Biogeosciences (Vol. 19, Issue 7) Peer-Reviewed

  Apr. 14, 2022304 words Brief article Emissions from biomass burning (BB) are a key source of atmospheric tracer gases that affect the atmospheric carbon cycle. We developed four sets of global BB emissions estimates (named GlcGlob, GlcGeoc, McdGlob, and...

• Estimation of fire-induced carbon emissions from Equatorial Asia in 2015 using in situ aircraft and ship observations.

  Authors:Yosuke Niwa, Yousuke Sawa, Hideki Nara, Toshinobu Machida, Hidekazu Matsueda, Taku Umezawa, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 12) Peer-Reviewed

  June 23, 2021283 words Brief article Inverse analysis was used to estimate fire carbon emissions in Equatorial Asia induced by the big El Niño event in 2015. This inverse analysis is unique because it extensively used high-precision atmospheric mole...

• Bias assessment of lower and middle tropospheric CO.sub.2 concentrations of GOSAT/TANSO-FTS TIR version 1 product

  Authors:Naoko Saitoh, Shuhei Kimoto, Ryo Sugimura, Ryoichi Imasu, Kei Shiomi, Akihiko Kuze, et al.From:Atmospheric Measurement Techniques (Vol. 10, Issue 10) Peer-Reviewed

  Oct. 24, 2017374 words Author abstract, Bri... CO.sub.2 observations in the free troposphere can be useful for constraining CO.sub.2 source and sink estimates at the surface since they represent CO.sub.2 concentrations away from point source emissions. The thermal...

• The Global Methane Budget 2000-2017.

  Authors:Marielle Saunois, Ann R. Stavert, Ben Poulter, Philippe Bousquet, Josep G. Canadell, Robert B. Jackson, et al.From:Earth System Science Data (Vol. 12, Issue 3) Peer-Reviewed

  July 15, 2020693 words Report Understanding and quantifying the global methane (CH.sub.4) budget is important for assessing realistic pathways to mitigate climate change. Atmospheric emissions and concentrations of CH.sub.4 continue to increase,...

• A 4D-Var inversion system based on the icosahedral grid model (NICAM-TM 4D-Var v1.0) - Part 1: Offline forward and adjoint transport models

  Authors:Yosuke Niwa, Hirofumi Tomita, Masaki Satoh, Ryoichi Imasu, Yousuke Sawa, Kazuhiro Tsuboi, et al.From:Geoscientific Model Development (Vol. 10, Issue 3) Peer-Reviewed

  Mar. 17, 2017345 words Author abstract, Bri... A four-dimensional variational (4D-Var) method is a popular algorithm for inverting atmospheric greenhouse gas (GHG) measurements. In order to meet the computationally intense 4D-Var iterative calculation, offline...

• Seasonal evaluation of tropospheric CO.sub.2 over the Asia-Pacific region observed by the CONTRAIL commercial airliner measurements

  Authors:Taku Umezawa, Hidekazu Matsueda, Yousuke Sawa, Yosuke Niwa, Toshinobu Machida, and Lingxi ZhouFrom:Atmospheric Chemistry and Physics (Vol. 18, Issue 20) Peer-Reviewed

  Oct. 17, 2018363 words Author abstract, Bri...

  Measurement of atmospheric carbon dioxide (CO.sub.2) is indispensable for top-down estimation of surface CO.sub.2 sources/sinks by an atmospheric transport model. Despite the growing importance of Asia in the global...

• Global Carbon Budget 2020.

  Authors:Pierre Friedlingstein, Michael O'Sullivan, Matthew W. Jones, Robbie M. Andrew, Judith Hauck, Are Olsen, et al.From:Earth System Science Data (Vol. 12, Issue 4) Peer-Reviewed

  Dec. 11, 2020643 words Article Accurate assessment of anthropogenic carbon dioxide (CO.sub.2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate - the "global carbon budget" - is important...

• Secular change in atmospheric Ar/N.sub.2 and its implications for ocean heat uptake and Brewer-Dobson circulation.

  Authors:Shigeyuki Ishidoya, Satoshi Sugawara, Yasunori Tohjima, Daisuke Goto, Kentaro Ishijima, Yosuke Niwa, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 2) Peer-Reviewed

  Feb. 1, 2021414 words Article Systematic measurements of the atmospheric Ar/N.sub.2 ratio have been made at ground-based stations in Japan and Antarctica since 2012. Clear seasonal cycles of the Ar/N.sub.2 ratio with summertime maxima were found at...