Changes of North Pacific Intermediate Water properties in the subtropical gyre

2007 ◽  
Vol 34 (2) ◽  
Author(s):  
Shinya Kouketsu ◽  
Ikuo Kaneko ◽  
Takeshi Kawano ◽  
Hiroshi Uchida ◽  
Toshimasa Doi ◽  
...  
Keyword(s):  
North Pacific ◽  
Subtropical Gyre ◽  
Intermediate Water ◽  
North Pacific Intermediate Water ◽  
Water Properties

Changes in water properties around North Pacific intermediate water between the 1980s, 1990s and 2000s

2010 ◽  
Vol 57 (13-14) ◽  
pp. 1177-1187 ◽  
Author(s):  
Shinya Kouketsu ◽  
Masao Fukasawa ◽  
Daisuke Sasano ◽  
Yuichiro Kumamoto ◽  
Takeshi Kawano ◽  
...  
Keyword(s):  
North Pacific ◽  
Intermediate Water ◽  
North Pacific Intermediate Water ◽  
Water Properties

scholarly journals Multidecadal-Scale Freshening at the Salinity Minimum in the Western Part of North Pacific: Importance of Wind-Driven Cross-Gyre Transport of Subarctic Water to the Subtropical Gyre

2015 ◽  
Vol 45 (4) ◽  
pp. 988-1008 ◽  
Author(s):  
Takuya Nakanowatari ◽  
Humio Mitsudera ◽  
Tatsuo Motoi ◽  
Ichiro Ishikawa ◽  
Kay I. Ohshima ◽  
...  
Keyword(s):  
Ocean Circulation ◽  
North Pacific ◽  
Model Simulation ◽  
Kuroshio Extension ◽  
Marked Change ◽  
Coupled Model ◽  
Subtropical Gyre ◽  
Intermediate Water ◽  
North Pacific Intermediate Water ◽  
The North

AbstractUsing oceanographic observations and an eddy-resolving ice–ocean coupled model simulation from 1955 to 2004, the effects of the wind-driven ocean circulation change that occurred in the late 1970s during multidecadal-scale freshening of the North Pacific Intermediate Water (NPIW) at salinity minimum density (~26.8 σθ) were investigated. An analysis of the observations revealed that salinity decreased significantly at the density range of 26.6–26.8 σθ in the western subtropical gyre, including the mixed water region (MWR). The temporal variability of the salinity is dominated by the marked change in the late 1970s. With results similar to the observations, the model, selectively forced by the interannual variability of the wind-driven ocean circulation, simulated significant freshening of the intermediate layer over the subtropical gyre. The significant freshening is related to the increase in southward transport of the Oyashio associated with the intensification of the Aleutian low. Accompanying these changes, the intrusion of fresh and low potential vorticity water, originating in the Okhotsk Sea, to the MWR increased, and the freshening signal propagated farther southward in the western subtropical gyre during the subsequent 6 yr, crossing the Kuroshio Extension. These results indicate that the multidecadal-scale freshening of the NPIW is partly caused by intensification of the wind-driven cross-gyre transport of the subarctic water to the subtropical gyre.

Chlorofluorocarbons in the western North Pacific in 1993 and formation of North Pacific intermediate water

1996 ◽  
Vol 52 (4) ◽  
pp. 475-490 ◽  
Author(s):  
Takayuki Tokieda ◽  
Shuichi Watanabe ◽  
Shizuo Tsunogai
Keyword(s):  
North Pacific ◽  
Western North Pacific ◽  
Intermediate Water ◽  
North Pacific Intermediate Water

Hydrographic structure and transport of the Oyashio south of Hokkaido and the formation of North Pacific Intermediate Water

2001 ◽  
Vol 106 (C4) ◽  
pp. 6931-6942 ◽  
Author(s):  
Ichiro Yasuda ◽  
Yutaka Hiroe ◽  
Kosei Komatsu ◽  
Kiyoshi Kawasaki ◽  
Terrence M. Joyce ◽  
...  
Keyword(s):  
North Pacific ◽  
Intermediate Water ◽  
North Pacific Intermediate Water ◽  
Hydrographic Structure

scholarly journals The Bacterial Community in the Western Region of North Pacific Intermediate Water

2019 ◽  
Vol 8 (34) ◽  
Author(s):  
Maki Teramoto ◽  
Ayumi Komatsu ◽  
Kouhei Ohnishi
Keyword(s):  
Bacterial Community ◽  
North Pacific ◽  
Water Mass ◽  
Western Region ◽  
Intermediate Water ◽  
North Pacific Intermediate Water ◽  
Bacterial Composition ◽  
The Western Region

The bacterial composition in North Pacific Intermediate Water (NPIW) was investigated in three different years and compared with that in other seawaters around Japan. The results indicated that bacterial composition was surprisingly stable at the same point in a mesopelagic water mass throughout the years and supported previous physicochemical observations that NPIW is distributed to Kumejima, Japan.

A modelling perspective of North Pacific Intermediate water in the future

2020 ◽  
Author(s):  
Xun Gong ◽  
Lars Ackermann ◽  
Gerrit Lohmann
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
Carbon Sink ◽  
North Pacific Ocean ◽  
Intermediate Water ◽  
North Pacific Intermediate Water ◽  
The North ◽  
The Future ◽  
Near Future ◽  
The North Pacific

<p>North Pacific Intermediate water (NPIW) is a dominant water mass controlling ~400-1200m depth North Pacific Ocean, characterized by its low salinities and relatively lower temperatures. In the modern climate, the interplay between NPIW-related physical and biogeochemical processes among seasons determines annual-mean budget and efficiency of carbon sink into the North Pacific Ocean. Thus, to understand the NPIW physics is key to project roles of the North Pacific Ocean in changing Earth climate and carbon systems in the future. In this study, we provide a modelling view of the NPIW history since Yr 1850 (historical experiment) and its projection to near future (IPCC-defined RCP 4.2 and 8.5 experiments until Yr 2100), using new-generation Alfred Wegener Institute Earth System Model (AWI-ESM). Our results suggest an important role of regional hydroclimate feedback over the NW Pacific and Sea of Okhotsk in determining the NPIW from recent past to near future.</p>

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