Observations of anticyclonic eddies in the western subarctic North Pacific

被引:6
作者
Dobashi, Ryo [1 ]
Ueno, Hiromichi [1 ]
Okada, Yuki [1 ]
Tanaka, Takahiro [2 ]
Nishioka, Jun [3 ]
Hirawake, Toru [1 ]
Ooki, Atushi [1 ]
Itoh, Sachihiko [4 ]
Hasegawa, Daisuke [2 ]
Sasai, Yoshikazu [5 ]
Sasaki, Hideharu [6 ]
Yasuda, Ichiro [4 ]
机构
[1] Hokkaido Univ, Grad Sch Fisheries Sci, Fac Fisheries Sci, 3-1-1 Minato Cho, Hakodate, Hokkaido 0418611, Japan
[2] Japan Fisheries Res & Educ Agcy, Fisheries Resources Inst, 3-27-5 Shinhama Cho, Shiogama 9850001, Japan
[3] Hokkaido Univ, Inst Low Temp Sci, Kita Ku, Kita 19,Nishi 8, Sapporo, Hokkaido 0600819, Japan
[4] Univ Tokyo, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan
[5] JAMSTEC, Res Inst Global Change, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan
[6] JAMSTEC, Applicat Lab, Kanazawa Ku, 3173-25 Showa Machi, Yokohama, Kanagawa 2360001, Japan
关键词
Western subarctic North Pacific; Mesoscale eddy; Primary production; Microstructure observation; Iron availability; ALASKAN STREAM; MIXED-LAYER; CHLOROPHYLL-A; IRON; GULF; WATER; EDDY; SATELLITE; TRANSPORT; SEAWATER;
D O I
10.1007/s10872-020-00586-y
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
We conducted a ship observation of two anticyclonic mesoscale eddies (Eddies A and B) between June and July 2016 in the offshore region of the western subarctic North Pacific to clarify the impact of anticyclonic eddies on biological production. Analysis of satellite data reveals that Eddy A formed south of the Alaskan Peninsula on May 2011 while Eddy B formed in the observation area on November 2015. Iron concentration was low both inside and outside Eddies A and B, and there were no large differences between chlorophyll a (chl-a) concentration inside and outside eddies. Satellite-derived chl-a concentration inside Eddy A had been high compared with that in the surrounding area when the eddy was located along the Aleutian Islands and just after it detached from the islands, suggesting that iron originating from the coastal region was consumed during the two-year journey from the coastal region to the observation area. Field measurements also reveal that vertical diffusivity was low both inside and outside Eddies A and B, which could be another factor underlying low iron both inside and outside Eddies A and B and small differences between chl-a concentration inside and outside the eddies.
引用
收藏
页码:229 / 242
页数:14
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