Interannual variations of Kuroshio transport in the East China Sea and its relation to the Pacific Decadal Oscillation and mesoscale eddies

2014 ◽  
Vol 119 (6) ◽  
pp. 3595-3616 ◽  
Author(s):  
Endro Soeyanto ◽  
Xinyu Guo ◽  
Jun Ono ◽  
Yasumasa Miyazawa
Keyword(s):  
East China Sea ◽  
Pacific Decadal Oscillation ◽  
Mesoscale Eddies ◽  
East China ◽  
Interannual Variations ◽  
The East China Sea ◽  
China Sea ◽  
The Pacific ◽  
Kuroshio Transport

Coccolithophore responses to the Pacific Decadal Oscillation in the East China Sea region of the Northwest Pacific from ad 1901 to 2013

2019 ◽  
Vol 34 (4-5) ◽  
pp. 333-341 ◽  
Author(s):  
Shu Yang ◽  
Mingli Yuan ◽  
Qian Yang ◽  
Jiansheng Huang ◽  
Mengran Sun ◽  
...  
Keyword(s):  
East China Sea ◽  
Pacific Decadal Oscillation ◽  
East China ◽  
Northwest Pacific ◽  
The East China Sea ◽  
China Sea ◽  
The Pacific

The Cumacean Dimorphostylis elegans Gamô, 1960 (Crustacea), D. bathyelegans n. sp. and D. brevicarpus n. sp. from Japan

Zootaxa ◽  
2011 ◽  
Vol 2994 (1) ◽  
pp. 45 ◽  
Author(s):  
TADASHI AKIYAMA
Keyword(s):  
East China Sea ◽  
Ventral Surface ◽  
East China ◽  
Southern Coast ◽  
The East China Sea ◽  
China Sea ◽  
The Third ◽  
The Pacific ◽  
Nansei Islands ◽  
Honshu Island

Dimorphostylis elegans Gamô, 1960 and two related new species, D. bathyelegans n. sp. and D. brevicarpus n. sp. are described. Dimorphostylis elegans were collected from the Pacific coasts of Honshu and Shikoku Islands, and the East China Sea, Japan, 74–443 m. As a result, D. latifrons Harada, 1960 from the Izu Peninsula, Japan is declared a junior synonym of D. elegans. Morphological variation of the carapace is discussed. Dimorphostylis bathyelegans, from southern coast of the Honshu Island and the East China Sea, is very similar to D. elegans, but is distinguished from the latter by the long telson and the third peduncle article of antenna 1 with more short setae. Depth of the habitat ranges from 495–918 m, which is the deepest known species in the genus. Dimorphostylis brevicarpus was collected from Kyushu and Nansei Islands, East China Sea, on sandy bottoms, 165–236 m deep. This species also resembles D. elegans, but is distinguished from the latter by (1) short carpus of pereopods 3–5, (2) anterior end of dorsolateral carina with 2 or 3 teeth, and (3) maxilliped 1 with a group of sharp spines on the ventral surface of basis, and (4) carapace covered with numerous small pits, with a tiny seta in each.

scholarly journals Variations of surface ozone at Ieodo Ocean Research Station in the East China Sea and influence of Asian outflows

2015 ◽  
Vol 15 (12) ◽  
pp. 16747-16774
Author(s):  
J. Han ◽  
B. Shin ◽  
M. Lee ◽  
G. Hwang ◽  
J. Kim ◽  
...  
Keyword(s):  
East China Sea ◽  
Surface Ozone ◽  
East China ◽  
Research Station ◽  
The East China Sea ◽  
Ozone Level ◽  
China Sea ◽  
Ozone Concentrations ◽  
The Pacific ◽  
Summer Minimum

Abstract. Ieodo Ocean Research Station (IORS), a research tower (~ 40 m a.s.l.) for atmospheric and oceanographic observations, is located in the East China Sea (32.07° N, 125.10° E). The IORS is almost equidistant from South Korea, China, and Japan and, therefore, it is an ideal place to observe Asian outflows without local emission effects. The average ozone concentrations were 51.8 ± 15.9 ppbv during June 2003–December 2010. The seasonal variation of ozone was distinct, with a summer minimum (37.8 ppbv) and a spring maximum (61.1 ppbv), and was largely affected by seasonal wind pattern over East Asia. The fractional contribution of ozone at IORS could be attributed to six well distinguished air masses that were classified by the cluster analysis of backward trajectories. Marine air from the Pacific Ocean represents a relatively clean background air with a lowest ozone level of 32.2 ppbv in summer. In spring and winter the influence of Chinese outflows was dominant with higher ozone concentrations of 61.6 and 49.3 ppbv, respectively. This study confirms that the influence of Chinese outflows was the main factor determining O3 levels at IORS, of which extent was apt to be changed by meteorological state, particularly at a long-term scale.

Interannual variability of typhoon-induced northeast Asian marginal seas-mean sea level

2021 ◽  
Author(s):  
MyeongHee Han ◽  
SungHyun Nam
Keyword(s):  
Sea Level ◽  
East China Sea ◽  
East China ◽  
Interannual Variations ◽  
The East China Sea ◽  
Mean Sea Level ◽  
China Sea ◽  
Marginal Seas ◽  
Pass Through ◽  
Northeast Asian

<p><span>As connected through relatively narrow and shallow straits, inflow and outflow volume transports of the northeast Asian marginal seas (NEAMS) are strongly forced to yield significant convergence or divergence and resulting rise or drop in spatially-averaged sea level. Here, we examined interannual variations of August NEAMS-mean sea level observed from satellite altimetry from 1993 to 2019. Typhoon activity was found to be a primary factor controlling the interannual variations of NEAMS-mean sea level in August. Relatively high August sea level over the NEAMS is derived in years when more typhoons pass through the East China Sea (Period H) due to typhoon-induced Ekman transports. The resultant NEAMS-mean sea level is a few cm higher than that during the years of less or no typhoon activity in the East China Sea (Period L). This study highlights the importance of typhoon (hurricane) activity on interannual variations of regional sea level in the mid-latitude and semi-enclosed marginal seas.</span></p>

scholarly journals Loggerhead turtle (Caretta caretta) movement off the coast of Taiwan: characterization of a hotspot in the East China Sea and investigation of mesoscale eddies

2011 ◽  
Vol 68 (4) ◽  
pp. 707-718 ◽  
Author(s):  
Donald R. Kobayashi ◽  
I-Jiunn Cheng ◽  
Denise M. Parker ◽  
Jeffrey J. Polovina ◽  
Naoki Kamezaki ◽  
...  
Keyword(s):  
East China Sea ◽  
Statistical Error ◽  
Mesoscale Eddies ◽  
Loggerhead Turtle ◽  
Caretta Caretta ◽  
East China ◽  
The East China Sea ◽  
Remotely Sensed Data ◽  
China Sea

Abstract Kobayashi, D. R., Cheng, I-J., Parker, D. M., Polovina, J. J., Kamezaki, N., and Balazs, G. H. 2011. Loggerhead turtle (Caretta caretta) movement off the coast of Taiwan: characterization of a hotspot in the East China Sea and investigation of mesoscale eddies. – ICES Journal of Marine Science, 68: 707–718. Satellite tags were attached to 34 non-reproductive loggerhead turtles (Caretta caretta) caught as bycatch in the Taiwanese coastal poundnet fishery from 2002 to 2008. Transmission durations ranged from 6 to 503 d (median 172 d), with 5860 d tracked in total. Horizontal track data were processed using the Bayesian state-space modelling to extract the most likely daily positions, taking into account ARGOS data quality and other forms of statistical error. A region of high occupancy in the East China Sea, covering 433 549 km2 of coastal and pelagic area next to Taiwan, China, Japan, and South Korea, was characterized from the tracking data. Various attributes of this hotspot are described using satellite tracks and remotely sensed data. The tracks were merged with oceanographic data, emphasizing a new global dataset characterizing mesoscale eddies from satellite altimetry data. A proximity-probability approach coupled with odds ratio testing was used to infer orientation to eddy features. Comparisons against random points, simulated particle tracks, and drifter buoys were used to demonstrate turtle differential responses to eddies inside and outside the hotspot, depending on eddy features (i.e. cyclonic vs. anticyclonic, edges vs. centres). Turtles inside the hotspot utilize fewer strong cyclonic eddy edges than those outside.

scholarly journals Observational Analysis of Sudden Tropical Cyclone Track Changes in the Vicinity of the East China Sea

2011 ◽  
Vol 68 (12) ◽  
pp. 3012-3031 ◽  
Author(s):  
Liguang Wu ◽  
Huijun Zong ◽  
Jia Liang
Keyword(s):  
East China Sea ◽  
Low Frequency ◽  
Satellite Orbit ◽  
Underlying Mechanism ◽  
East China ◽  
Synoptic Scale ◽  
The East China Sea ◽  
Observational Analysis ◽  
China Sea ◽  
The Pacific

Abstract An observational analysis of observed sudden typhoon track changes is conducted with a focus on the underlying mechanism and the possible role of slowly varying low-frequency flows. Four typhoons that took a generally northwestward track prior to sharply turning northeastward in the vicinity of the East China Sea are investigated. It is found that the sudden track changes occurred near the center of the Madden–Julian oscillation (MJO)-scale cyclonic circulation or at the bifurcation point of the steering flows at 700 hPa, and they were all associated with a well-developed quasi-biweekly oscillation (QBW)-scale gyre. Calculation of vorticity advection suggests that the peripheral ridging resulting from the interaction between the typhoons and the flows on the MJO and QBW scales can compress the typhoon circulation, leading to an area of high winds to the east or south of the typhoon center. The enhanced synoptic-scale winds shifted the typhoons northward and placed them in a northeastward orbit under the steering of the flows associated with the Pacific subtropical high. The sudden track change can be likened to the maneuvering of satellite orbit change in that the enhanced synoptic-scale winds act as a booster rocket to shift the typhoons northward to the southwesterly steering flows.

scholarly journals Interannual variations in distribution and abundance of Japanese jack mackerel Trachurus japonicus larvae in the East China Sea

2016 ◽  
Vol 73 (4) ◽  
pp. 1170-1185 ◽  
Author(s):  
Chiyuki Sassa ◽  
Motomitsu Takahashi ◽  
Yoshinobu Konishi ◽  
Youichi Tsukamoto
Keyword(s):  
East China Sea ◽  
East China ◽  
Late Winter ◽  
Larval Abundance ◽  
Interannual Variations ◽  
Jack Mackerel ◽  
The East China Sea ◽  
Trachurus Japonicus ◽  
China Sea ◽  
Japanese Jack Mackerel

Abstract We examined the interannual variations in distribution and abundance of Japanese jack mackerel Trachurus japonicus larvae <5 mm standard length (SL), based on sampling surveys over a broad area of the shelf break region of the East China Sea (ECS) during late winter and spring for 12 years from 2001 to 2012. Larval abundances in late winter were higher than those in spring. In late winter, ratios (expressed as %) of larval abundance in the southern ECS south of 28°N to the whole study area were highest during the study period, with values ranging from 80.0 to 95.8%. In spring, the ratios in the southern ECS were still high (34.3–88.8%), although the values increased slightly in the northern and central ECS. There was no significant interannual variation in the centre of distribution of the larvae, suggesting that the formation of spawning grounds would be related to topographic rather than hydrographic conditions. Habitat temperature of larvae in the central and southern ECS was ∼3–5°C higher than that in the northern ECS throughout the study period, indicating that larval growth and survival processes may differ between the two areas. In the southern ECS, larval abundances fluctuated largely from year-to-year, and the interannual variations were closely correlated with water temperature and chlorophyll a concentration. However, larval abundance did not correlate with an index of recruited juveniles (∼50–75 mm SL) in the ECS, suggesting that mortality during the late larval and early juvenile stages is responsible for recruitment success or failure.

scholarly journals Variations of surface ozone at Ieodo Ocean Research Station in the East China Sea and the influence of Asian outflows

2015 ◽  
Vol 15 (21) ◽  
pp. 12611-12621 ◽  
Author(s):  
J. Han ◽  
B. Shin ◽  
M. Lee ◽  
G. Hwang ◽  
J. Kim ◽  
...  
Keyword(s):  
East China Sea ◽  
Surface Ozone ◽  
East China ◽  
Research Station ◽  
The East China Sea ◽  
Ozone Level ◽  
Air Masses ◽  
China Sea ◽  
The Pacific ◽  
Marine Air

Abstract. Ieodo Ocean Research Station (IORS), a research tower (~ 40 m a.s.l.) for atmospheric and oceanographic observations, is located in the East China Sea (32.07° N, 125.10° E). The IORS is almost equidistant from South Korea, China, and Japan and, therefore, it is an ideal place to observe Asian outflows without local emission effects. The seasonal variation of ozone was distinct, with a minimum in August (37 ppbv) and two peaks in April and October (62 ppbv), and was largely affected by the seasonal wind pattern over east Asia. At IORS, six types of air masses were distinguished with different levels of O3 concentrations by the cluster analysis of backward trajectories. Marine air masses from the Pacific Ocean represent a relatively clean background air with a lowest ozone level of 32 ppbv, which was most frequently observed in summer (July–August). In spring (March–April) and winter (December–February), the influence of Chinese outflows was dominant with higher ozone concentrations of 62 and 49 ppbv, respectively. This study confirms that the influence of Chinese outflows was the main factor determining O3 levels at IORS and its extent was dependent on meteorological state, particularly at a long-term scale.

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