Zobrazeno 1 - 10
of 222
pro vyhledávání: '"Shuji, Aoki"'
Autor:
Taku Umezawa, Satoshi Sugawara, Kenji Kawamura, Ikumi Oyabu, Stephen J. Andrews, Takuya Saito, Shuji Aoki, Takakiyo Nakazawa
Publikováno v:
Atmospheric Chemistry and Physics. 22:6899-6917
Systematic measurements of atmospheric methane (CH4) mole fractions at the northern high latitudes only began in the early 1980s. Although CH4 measurements from Greenland ice cores consistently covered the period before ∼ 1900, no reliable observat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d9a1819678198b29e7bdb318f44e29f
https://doi.org/10.5194/acp-22-6899-2022
https://doi.org/10.5194/acp-22-6899-2022
Autor:
Shigeyuki Ishidoya, Hiroshi Uchida, Daisuke Sasano, Naohiro Kosugi, Shoichi Taguchi, Masao Ishii, Shinji Morimoto, Yasunori Tohjima, Shigeto Nishino, Shohei Murayama, Shuji Aoki, Kentaro Ishijima, Ryo Fujita, Daisuke Goto, Takakiyo Nakazawa
Publikováno v:
Tellus: Series B, Chemical and Physical Meteorology, Vol 68, Iss 0, Pp 1-13 (2016)
Simultaneous observations of atmospheric potential oxygen (APO=O2+1.1×CO2) and air–sea O2 flux, derived from dissolved oxygen in surface seawater, were carried out onboard the research vessel MIRAI in the northern North Pacific and the Arctic Ocea
Externí odkaz:
https://doaj.org/article/e7e0f689e9ca43bcac3fd8da493160c9
Autor:
Ikumi Oyabu, Kenji Kawamura, Tsutomu Uchida, Shuji Fujita, Kyotaro Kitamura, Motohiro Hirabayashi, Shuji Aoki, Shinji Morimoto, Takakiyo Nakazawa, Jeffrey P. Severinghaus, Jacob D. Morgan
Publikováno v:
The Cryosphere. 15:5529-5555
The variations of δO2/N2 and δAr/N2 in the Dome Fuji ice core were measured from 112 m (bubbly ice) to 2001 m (clathrate hydrate ice). Our method, combined with the low storage temperature of the samples (−50 ∘C), successfully excludes post-cor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfb58677182fc433d0abf2a3a1856692
https://doi.org/10.5194/tc-15-5529-2021
https://doi.org/10.5194/tc-15-5529-2021
Autor:
Ikumi, Oyabu, Kenji, Kawamura, Christo, Buizert, Frédéric, Parrenin, Anais, Orsi, Kyotaro, Kitamura, Shuji, Aoki, Takakiyo, Nakazawa
The 13th Symposium on Polar Science/Ordinary sessions [OM] Polar meteorology and glaciology, Wed. 16 Nov.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=jairo_______::b66218c248715d6b44b36316dda54832
http://id.nii.ac.jp/1291/00016999/
http://id.nii.ac.jp/1291/00016999/
Publikováno v:
Tellus: Series B, Chemical and Physical Meteorology, Vol 69, Iss 1 (2017)
Oxygen in the atmosphere undergoes variations and changes in response to biospheric activities, ocean–atmosphere exchange and fossil fuel combustion. Continuous in situ measurements of atmospheric δ(O2/N2) and CO2 mole fraction were started at Ny-
Externí odkaz:
https://doaj.org/article/04678b2cced64eb5bdaa807ddfae9ac2
Publikováno v:
Tellus: Series B, Chemical and Physical Meteorology, Vol 69, Iss 1 (2017)
We have conducted systematic observations of the CH4 mole fraction and its carbon isotope ratio (δ13C) at Ny-Ålesund, Svalbard (78°55′N, 11°56′E) using air samples collected weekly since 1991 and 1996, respectively. The CH4 mole fraction show
Externí odkaz:
https://doaj.org/article/0e48eb32a8ef4c4d841a7e1c9bdcf6f6
Autor:
Taku Umezawa, Daisuke Goto, Shuji Aoki, Kentaro Ishijima, Prabir K. Patra, Satoshi Sugawara, Shinji Morimoto, Takakiyo Nakazawa
Publikováno v:
Tellus: Series B, Chemical and Physical Meteorology, Vol 66, Iss 0, Pp 1-18 (2014)
We present observations of CH4 concentrations from the lower to upper troposphere (LT and UT) over Japan during 1988–2010 based on aircraft measurements from the Tohoku University (TU). The analysis is aided by simulation results using an atmospher
Externí odkaz:
https://doaj.org/article/0d7f38406c0642ef9ba49b4f95cb0f05
Autor:
Nobuko Saigusa, Shinji Morimoto, Akihiko Ito, Ryo Fujita, Greet Janssens-Maenhout, Shingo Watanabe, Jagat Singh Heet Bisht, Shuji Aoki, Josep G. Canadell, Taku Umezawa, Naveen Chandra, Naoko Saitoh, Prabir K. Patra, Masayuki Takigawa
Publikováno v:
Journal of the Meteorological Society of Japan. Ser. II. 99:309-337
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35007d329cc1aec524d90731a6f5da8c
https://doi.org/10.2151/jmsj.2021-015
https://doi.org/10.2151/jmsj.2021-015
Autor:
Shigeyuki Ishidoya, Shohei Murayama, Chikako Takamura, Hiroaki Kondo, Nobuko Saigusa, Daisuke Goto, Shinji Morimoto, Nobuyuki Aoki, Shuji Aoki, Takakiyo Nakazawa
Publikováno v:
Tellus: Series B, Chemical and Physical Meteorology, Vol 65, Iss 0, Pp 1-10 (2013)
Detailed observations of O2:CO2 exchange ratios were conducted in a cool temperate deciduous forest located in central Japan. The exchange ratios of soil respiration and net assimilation were found to be 1.11±0.01 and 1.02±0.03 from soil chamber an
Externí odkaz:
https://doaj.org/article/ce5e63ac74b646b0bde91a4ca59c2031
Publikováno v:
Antarctic Record, Vol 57, Iss 1, Pp 17-27 (2013)
With the aim of carrying out detailed monitoring of temporal variations in the atmospheric O_2/N_2 ratio at Ny-Alesund, Svalbard, we have developed a new highprecision continuous measurement system, with a precision of better than ±4.0 per meg, usin
Externí odkaz:
https://doaj.org/article/029f74a2d8574b36831df86991f078d1