毎週木曜午前 10:00 より東京大学柏キャンパス総合研究棟 210 号室にて開催
担当 山田 kodai(at)aori.u-tokyo.ac.jp
2018 年度前期 発表者予定 (敬称略)
04/26 M1
05/03 休み
05/10 柳本
(大気海洋研究所 海洋地球システム研究系 助教)
05/17 孫
(大気海洋研究所 海洋地球システム研究系 M2)
05/17 徐
(大気海洋研究所 海洋地球システム研究系 研究生)
05/24 休み
05/31 宮本
(大気海洋研究所 海洋地球システム研究系 D3)
06/07 李
(大気海洋研究所 海洋地球システム研究系 研究員)
06/12 Fang
(アラスカ大学)
06/14 桂
(大気海洋研究所 気候システム研究系 研究員)
06/21 木村
(大気海洋研究所 海洋地球システム研究系 M1)
06/28 矢部
(大気海洋研究所 海洋地球システム研究系 D1)
07/05 翟
(大気海洋研究所 海洋地球システム研究系 M1)
07/12 安藤
(大気海洋研究所 気候システム研究系 M1)
07/19 小林
(大気海洋研究所 気候システム研究系 研究員)
07/26 山田
(大気海洋研究所 気候システム研究系 D1)
過去の発表概要はこちら
内容:
卒業研究の内容紹介
紹介論文:
・
Hautala, S. L. (2018):
The abyssal and deep circulation of the Northeast
Pacific Basin,
Prog. Oceanogr., 160, 68--82.
紹介論文:
・
Takahashi, D. et al. (2018):
Wind- and density-driven circulation in a bay on the Sanriku ria coast, Japan: study of Shizugawa Bay facing the Pacific Ocean,
J. Oceanogr., 74, 81--100.
内容:
北極海の自動漂流観測システムを用いた研究
内容:
Cyclonic eddies in the Deep Western Boundary Current around Greenland
内容:
Extensive measurements were carried out to investigate the detailed
structures of turbulence, hydrography, chlorophyll-a using a glider,
SeaExplorer manufactured by Alseamar, equipped with two shear probes,
two fast response thermistors, CTD, dissolved oxygen sensor,
fluorometer. The fine measurement of 65 casts lasted for 7 days during
20-27, June 2017.
The full path of glider shows Kuroshio interact with various waters with
different salinity and temperature. For example, low salinity and low
temperature water intruded at subsurface during 23-24, June. Around 600
m during 26-27, June we also found salinity minimum which was assumed
with North Pacific Intermediate Water. Distinct chlorophyll-a patch
above 0.5is also interesting feature in our focused area. High
dissipation rates above 10^-8 Wkg^-1 were observed through entire water
column with limited depth which glider measures. This seems to be
influenced by surface wind stress with approach of low pressure and
rough bottom topography.
While, calculated vertical nutrient flux is not quite high supporting
biological productivity as we expected. Contribution of double diffusion
which intensify the vertical diffusivity could be considered as
development of chlorophyll-a patch at subsurface. Previous research
already introduced the possibility of enhanced mixing from double
diffusion (Nagai et al., 2015, Inoue et al., 2007) and Hamilton et al.,
(1989) showed underestimation of vertical nutrient flux without using
vertical eddy diffusivity for salt in case of salt finger. Interacted
with low salinity water which was occurred during our mission show
another evidence for supporting this hypothesis.
参考論文:
・
Katsura (2018):
Properties, Formation, and Dissipation of the North Pacific Eastern Subtropical Mode Water and Its Impact on Interannual Spiciness Anomalies,
Prog. Oceanogr., 162, 120--131.
紹介論文:
・
Tanaka et al. (2015):
Observation of current and mixing around the shelf break in Pribilof Canyon in the Bering Sea,
J. Oceanogr., 71, 1--17.
紹介論文:
・
Nakano et al. (2018):
Identifcation of the fronts from the Kuroshio Extension to the Subarctic Current using absolute dynamic topographies
in satellite altimetry products,
J. Oceanogr., , 1--28.
紹介論文:
・
Kunze (2017):
The Internal-Wave-Driven Meridional Overturning Circulation,
J. Phys. Oceanogr., 47, 2673--2689.
紹介論文:
・
Menviel et al. (2018):
Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO2 rise,
Nat. Commun., 9.
紹介論文:
・
Chen et al. (2016):
Interannual and interdecadal variability of the North Equatorial Countercurrent in the Western Pacific,
J. Geophys. Res., Oceans, 121, 7743--7758.