Detecting fluctuations of the Kuroshio axis south of Japan using TOPEX/POSEIDON altimeter data

1996 ◽  
Vol 52 (1) ◽  
pp. 69-92 ◽  
Author(s):  
Shiro Imawaki ◽  
Mayumi Gotoh ◽  
Hiroyuki Yoritaka ◽  
Noriya Yoshioka ◽  
Atsunobu Misumi
Keyword(s):  
Altimeter Data ◽  
South Of Japan ◽  
The Kuroshio ◽  
Kuroshio Axis

scholarly journals Variability of Kuroshio Surface Axis Northeast of Taiwan Island Derived from Satellite Altimeter Data

2020 ◽  
Vol 12 (7) ◽  
pp. 1059
Author(s):  
Zhanpeng Zhuang ◽  
Quanan Zheng ◽  
Xi Zhang ◽  
Guangbing Yang ◽  
Xinhua Zhao ◽  
...  
Keyword(s):  
Altimeter Data ◽  
Spatial And Temporal Variability ◽  
Satellite Altimeter ◽  
Straight Path ◽  
Typical Period ◽  
Taiwan Island ◽  
The Impact ◽  
The Kuroshio ◽  
Satellite Altimeter Data ◽  
Kuroshio Axis

The spatial and temporal variability of the Kuroshio surface axis northeast of Taiwan Island is investigated using 24 years of surface geostrophic currents derived from satellite altimeter data from 1993 to 2016. The Kuroshio surface axis is derived by an extraction method with three selected parameters, including the length of the subsidiary line, the intervals between two adjacent points, and the distance between the two adjacent subsidiary lines. The empirical mode decomposition analysis on the 24-year Kuroshio axes reveals that the mean periods of intra-seasonal and inter-annual variability, which are the two dominant components, are about 3.2 months and 1.3 years, respectively. The self-organizing map analysis reveals that the variation of Kuroshio axis northeast of Taiwan Island has four best matching unit (BMU) patterns: straight-path (BMUS), meandering-path (BMUM) and two transition stages (BMUT1 and BMUT2). The straight-path pattern shows strong seasonality: more likely occurring in summer. The meandering-path pattern is less frequent than straight-path pattern. During a typical period from November 26, 2012 to January 27, 2013, which is chosen as an independent example, the analysis on the satellite altimeter and sea surface temperature data shows that the patterns of the Kuroshio axis change successively in order of BMUT1→BMUM→BMUT2→BMUS, i.e., the Kuroshio axis migrates from the meandering-path to the straight-path pattern. During the typical period the warm water intrusion and a mesoscale eddy occur at the second stage corresponding to BMUM and migrate northwestward gradually at the last two stages corresponding to BMUT2 and BMUS. The transient order appears only during this typical period but it is not common for the whole study period. The monthly mean relatively vorticity is calculated and analyzed to evaluate the impact of the eddies on the Kuroshio surface axis variability, the results show that the anticyclonic (cyclonic) eddies can promote the Kuroshio surface axis to present the meandering-path (straight-path) pattern because of the potential vorticity conservation. The impacts of the anticyclonic eddies and the cyclonic eddies on the variability of the Kuroshio surface axis are opposite. The long-term day-to-day detection contributes to improving understanding the variability of Kuroshio surface axis northeast of Taiwan Island.

Estimating the Kuroshio Axis South of Japan Using Combination of Satellite Altimetry and Drifting Buoys

2004 ◽  
Vol 60 (2) ◽  
pp. 375-382 ◽  
Author(s):  
Daisuke Ambe ◽  
Shiro Imawaki ◽  
Hiroshi Uchida ◽  
Kaoru Ichikawa
Keyword(s):  
Satellite Altimetry ◽  
South Of Japan ◽  
The Kuroshio ◽  
Kuroshio Axis ◽  
Drifting Buoys

Short-range prediction experiments of the Kuroshio path variabilities south of Japan

2006 ◽  
Vol 56 (5-6) ◽  
pp. 607-623 ◽  
Author(s):  
Norihisa Usui ◽  
Hiroyuki Tsujino ◽  
Yosuke Fujii ◽  
Masafumi Kamachi
Keyword(s):  
Short Range ◽  
Kuroshio Path ◽  
South Of Japan ◽  
The Kuroshio

Surface circulation in Sagami Bay: the response to variations of the Kuroshio axis

1989 ◽  
Vol 45 (5) ◽  
pp. 310-320 ◽  
Author(s):  
Shizuo Iwata ◽  
Masaji Matsuyama
Keyword(s):  
Sagami Bay ◽  
Surface Circulation ◽  
The Kuroshio ◽  
Kuroshio Axis

scholarly journals Satellite altimeter monitoring the Kuroshio Transport south of Japan

2001 ◽  
Vol 28 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Shiro Imawaki ◽  
Hiroshi Uchida ◽  
Hiroshi Ichikawa ◽  
Masao Fukasawa ◽  
Shin-ichiro Umatani ◽  
...  
Keyword(s):  
Satellite Altimeter ◽  
South Of Japan ◽  
The Kuroshio ◽  
Kuroshio Transport

Shifts of the Kuroshio axis over the last 20 000 years

1998 ◽  
Vol 43 (12) ◽  
pp. 1053-1056 ◽  
Author(s):  
Jian Zhimin ◽  
Y. Saito ◽  
Wang Pinxian ◽  
Li Baohua ◽  
Chen Ronghua
Keyword(s):  
The Kuroshio ◽  
Kuroshio Axis

Application of Sensitivity Analysis Using an Adjoint Model for Short-Range Forecasts of the Kuroshio Path South of Japan

2004 ◽  
Vol 60 (2) ◽  
pp. 293-301 ◽  
Author(s):  
Yoichi Ishikawa ◽  
Toshiyuki Awaji ◽  
Nobumasa Komori ◽  
Takahiro Toyoda
Keyword(s):  
Sensitivity Analysis ◽  
Short Range ◽  
Adjoint Model ◽  
Kuroshio Path ◽  
South Of Japan ◽  
The Kuroshio ◽  
Range Forecasts
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