Zobrazeno 1 - 10
of 3 390
pro vyhledávání: '"Y. Sawa"'
Autor:
Z. Wu, A. Vermeulen, Y. Sawa, U. Karstens, W. Peters, R. de Kok, X. Lan, Y. Nagai, A. Ogi, O. Tarasova
Publikováno v:
Atmospheric Chemistry and Physics, Vol 24, Pp 1249-1264 (2024)
The World Meteorological Organization (WMO) Global Atmosphere Watch (GAW) coordinates high-quality atmospheric greenhouse gas observations globally and provides these observations through the WMO World Data Centre for Greenhouse Gases (WDCGG) support
Externí odkaz:
https://doaj.org/article/13e3020487044e359b4369e41aa2f4b4
Autor:
Y. Niwa, Y. Sawa, H. Nara, T. Machida, H. Matsueda, T. Umezawa, A. Ito, S.-I. Nakaoka, H. Tanimoto, Y. Tohjima
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 9455-9473 (2021)
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 fraction data of carbon dioxide (CO2
Externí odkaz:
https://doaj.org/article/1f806382ce3041528a5845ba29a99d9a
Autor:
M. Ouchi, Y. Matsumi, T. Nakayama, K. Shimizu, T. Sawada, T. Machida, H. Matsueda, Y. Sawa, I. Morino, O. Uchino, T. Tanaka, R. Imasu
Publikováno v:
Atmospheric Measurement Techniques, Vol 12, Pp 5639-5653 (2019)
A novel, practical observation system for measuring tropospheric carbon dioxide (CO2) concentrations using a non-dispersive infrared analyzer carried by a small helium-filled balloon (CO2 sonde) has been developed for the first time. Vertical profile
Externí odkaz:
https://doaj.org/article/5c2b743a69cc48478f6c1c25230943f0
Autor:
Y. Inai, R. Fujita, T. Machida, H. Matsueda, Y. Sawa, K. Tsuboi, K. Katsumata, S. Morimoto, S. Aoki, T. Nakazawa
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 7073-7103 (2019)
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 of air masses originating in the
Externí odkaz:
https://doaj.org/article/a1460068769d4df1930a7002795ed0af
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 14851-14866 (2018)
Measurement of atmospheric carbon dioxide (CO2) is indispensable for top-down estimation of surface CO2 sources/sinks by an atmospheric transport model. Despite the growing importance of Asia in the global carbon budget, the region has only been s
Externí odkaz:
https://doaj.org/article/ddfa36deca114062900619f8153beb65
Publikováno v:
Nuclear Materials and Energy, Vol 16, Iss , Pp 133-136 (2018)
Composites of F82H and Fe added with W or Cu wires were sintered by spark plasma sintering in order to improve the thermal conductivity of F82H and pure Fe. W and Cu wires were two-dimensionally distributed on the plane perpendicular to pressure dire
Externí odkaz:
https://doaj.org/article/3d1ec5c502cd44e98cac2139f08ca76a
Autor:
N. Saitoh, S. Kimoto, R. Sugimura, R. Imasu, K. Shiomi, A. Kuze, Y. Niwa, T. Machida, Y. Sawa, H. Matsueda
Publikováno v:
Atmospheric Measurement Techniques, Vol 10, Pp 3877-3892 (2017)
CO2 observations in the free troposphere can be useful for constraining CO2 source and sink estimates at the surface since they represent CO2 concentrations away from point source emissions. The thermal infrared (TIR) band of the Thermal and Near
Externí odkaz:
https://doaj.org/article/6c7ceec3fa2c48c1aaadd31ee08c25e2
Autor:
Y. Niwa, Y. Fujii, Y. Sawa, Y. Iida, A. Ito, M. Satoh, R. Imasu, K. Tsuboi, H. Matsueda, N. Saigusa
Publikováno v:
Geoscientific Model Development, Vol 10, Pp 2201-2219 (2017)
A four-dimensional variational method (4D-Var) is a popular technique for source/sink inversions of atmospheric constituents, but it is not without problems. Using an icosahedral grid transport model and the 4D-Var method, a new atmospheric greenh
Externí odkaz:
https://doaj.org/article/621d714449e947d19ec523f8be60dbb7
Autor:
Y. Niwa, H. Tomita, M. Satoh, R. Imasu, Y. Sawa, K. Tsuboi, H. Matsueda, T. Machida, M. Sasakawa, B. Belan, N. Saigusa
Publikováno v:
Geoscientific Model Development, Vol 10, Iss 3, Pp 1157-1174 (2017)
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 forward and adjoint transport models
Externí odkaz:
https://doaj.org/article/40bec31cb5f447a3a6fd63a099273f14
Autor:
M. Inoue, I. Morino, O. Uchino, T. Nakatsuru, Y. Yoshida, T. Yokota, D. Wunch, P. O. Wennberg, C. M. Roehl, D. W. T. Griffith, V. A. Velazco, N. M. Deutscher, T. Warneke, J. Notholt, J. Robinson, V. Sherlock, F. Hase, T. Blumenstock, M. Rettinger, R. Sussmann, E. Kyrö, R. Kivi, K. Shiomi, S. Kawakami, M. De Mazière, S. G. Arnold, D. G. Feist, E. A. Barrow, J. Barney, M. Dubey, M. Schneider, L. T. Iraci, J. R. Podolske, P. W. Hillyard, T. Machida, Y. Sawa, K. Tsuboi, H. Matsueda, C. Sweeney, P. P. Tans, A. E. Andrews, S. C. Biraud, Y. Fukuyama, J. V. Pittman, E. A. Kort, T. Tanaka
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 8, Pp 3491-3512 (2016)
We describe a method for removing systematic biases of column-averaged dry air mole fractions of CO2 (XCO2) and CH4 (XCH4) derived from short-wavelength infrared (SWIR) spectra of the Greenhouse gases Observing SATellite (GOSAT). We conduct correlati
Externí odkaz:
https://doaj.org/article/30552d3ce0b04c219d41fa05ab7b9a32