Zobrazeno 1 - 10
of 240
pro vyhledávání: '"Takakiyo Nakazawa"'
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
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:
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
Autor:
Shigeyuki Ishidoya, Shinji Morimoto, Shuji Aoki, Shoichi Taguchi, Daisuke Goto, Shohei Murayama, Takakiyo Nakazawa
Publikováno v:
Tellus: Series B, Chemical and Physical Meteorology, Vol 64, Iss 0, Pp 1-8 (2012)
Simultaneous measurements of the atmospheric O2/N2 ratio and CO2 concentration were made at Ny-Ålesund, Svalbard, and Syowa, Antarctica for the period 2001–2009. Based on these measurements, the observed atmospheric potential oxygen (APO) values w
Externí odkaz:
https://doaj.org/article/2366c907357f48cd9da6751d16cafba2
Autor:
Shigeyuki Ishidoya, Shuji Aoki, Daisuke Goto, Takakiyo Nakazawa, Shoichi Taguchi, Prabir K. Patra
Publikováno v:
Tellus: Series B, Chemical and Physical Meteorology, Vol 64, Iss 0, Pp 1-14 (2012)
Systematic measurements of the atmospheric O2/N2 ratio have been made using aircraft and ground-based stations in Japan since 1999. The observed seasonal cycles of the O2/N2 ratio and atmospheric potential oxygen (APO) vary almost in opposite phase t
Externí odkaz:
https://doaj.org/article/f714642b1f404c49a9ae974075e18c49
Autor:
Gen Hashida, Shin-ichiro Nakaoka, Hisashi Ono, Takakiyo Nakazawa, Hisayuki Yoshikawa, Shuji Aoki, Shinji Morimoto, Takashi Yamanouchi, Tsuneo Odate, Mitsuo Fukuchi
Publikováno v:
Antarctic Record, Vol 54, Iss special issue, Pp 438-448 (2010)
In order to elucidate the secular trends of oceanic CO_2 uptake in the Indian sector of the Southern Ocean, pCO_2, the partial pressure of CO_2 in the ocean surface layer, has been measured since 1987 on board the icebreaker Shirase. Meridional distr
Externí odkaz:
https://doaj.org/article/579c3e5e33ba4949883bceefb2672fc5
Autor:
Shigeyuki Ishidoya, Satoshi Sugawara, Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa, Hideyuki Honda, Takashi Yamanouchi
Publikováno v:
Antarctic Record, Vol 54, Iss special issue, Pp 426-437 (2010)
To investigate the gravitational separation of atmospheric components in the stratosphere, air samples collected using an aircraft during the Arctic Airborne Measurement Program 2002 (AAMP02) were analyzed for the O_2 N_2 ratios (δ(O_2 N_2)), δ^N o
Externí odkaz:
https://doaj.org/article/369ba80646074cea964a275e294c9efd