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    Academic Journals

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• 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...

• 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...

• Development of a balloon-borne instrument for CO.sub.2 vertical profile observations in the troposphere.

  Authors:Mai Ouchi, Yutaka Matsumi, Tomoki Nakayama, Kensaku Shimizu, Takehiko Sawada, Toshinobu Machida, et al.From:Atmospheric Measurement Techniques (Vol. 12, Issue 10) Peer-Reviewed

  Oct. 24, 2019284 words Technical report, Br...

  A novel, practical observation system for measuring tropospheric carbon dioxide (CO.sub.2) concentrations using a non-dispersive infrared analyzer carried by a small helium-filled balloon (CO.sub.2 sonde) has been...

• Bias corrections of GOSAT SWIR XCO.sub.2 and XCH.sub.4 with TCCON data and their evaluation using aircraft measurement data

  Authors:Makoto Inoue, Isamu Morino, Osamu Uchino, Takahiro Nakatsuru, Yukio Yoshida, Tatsuya Yokota, et al.From:Atmospheric Measurement Techniques (Vol. 9, Issue 8) Peer-Reviewed

  Aug. 1, 2016203 words Brief article We describe a method for removing systematic biases of column-averaged dry air mole fractions of CO.sub.2 (XCO.sub.2) and CH.sub.4 (XCH.sub.4) derived from short-wavelength infrared (SWIR) spectra of the Greenhouse...

• Algorithm update of the GOSAT/TANSO-FTS thermal infrared CO.sub.2 product (version 1) and validation of the UTLS CO.sub.2 data using CONTRAIL measurements

  Authors:Naoko Saitoh, Shuhei Kimoto, Ryo Sugimura, Ryoichi Imasu, Shuji Kawakami, Kei Shiomi, et al.From:Atmospheric Measurement Techniques (Vol. 9, Issue 5) Peer-Reviewed

  May 13, 2016363 words Brief article The Thermal and Near Infrared Sensor for Carbon Observation (TANSO)-Fourier Transform Spectrometer (FTS) on board the Greenhouse Gases Observing Satellite (GOSAT) has been observing...

• Seasonal characteristics of trace gas transport into the extratropical upper troposphere and lower stratosphere

  Authors:Yoichi Inai, Ryo Fujita, Toshinobu Machida, Hidekazu Matsueda, Yousuke Sawa, Kazuhiro Tsuboi, et al.From:Atmospheric Chemistry and Physics (Vol. 19, Issue 10) Peer-Reviewed

  May 27, 2019237 words Author abstract, Bri...

  To investigate the seasonal characteristics of trace gas distributions in the extratropical upper troposphere and lower stratosphere (ExUTLS) as well as stratosphere-troposphere exchange processes, origin fractions...