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.

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 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.

scholarly journals Dissolved organic carbon dynamics in the East China Sea and the northwest Pacific Ocean

Ocean Science ◽  
2019 ◽  
Vol 15 (5) ◽  
pp. 1177-1190 ◽  
Author(s):  
Ling Ding ◽  
Tiantian Ge ◽  
Xuchen Wang
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
East China Sea ◽  
Water Samples ◽  
Water Masses ◽  
East China ◽  
Northwest Pacific ◽  
The East China Sea ◽  
China Sea ◽  
The Kuroshio

Abstract. Oceanic dissolved organic carbon (DOC) represents one of the largest carbon reservoirs on Earth, and its distribution and biogeochemical cycles play important roles in carbon cycling and other biogeochemical processes in the ocean. We report the distribution and concentrations of DOC for water samples collected from the shelf-edge and slope regions in the East China Sea (ECS) and the Kuroshio Extension (KE) in the northwestern North Pacific during two cruises in 2014–2015. The DOC concentrations were 45–88 µM in the ECS and 35–65 µM in the KE. In addition to biological processes that are estimated to account for 7 % and 8 %–20 % in shaping the DOC distribution in the ECS and KE regions, respectively, the DOC distribution is largely controlled by hydrodynamic mixing of different water masses. By comparing the DOC results with dissolved inorganic carbon (DIC) and dissolved inorganic radiocarbon (Δ14C-DIC) measured from the same water samples, we further demonstrate that the intrusion of the Kuroshio Current could dilute the DOC concentrations at stations in the outer shelf and slope regions of the ECS. The concentrations of DOC in the KE were significantly lower in surface waters than in the ECS, and a relatively low and stable DOC level (∼40 µM) was found in deep water (below 1500 m) at all stations. Based on the previously reported DIC and Δ14C-DIC values for the stations, the observed spatial variations of DOC in the upper 700 m among the stations in the KE were mainly influenced by mixing of the two water masses carried by the Kuroshio and Oyashio, the two dominant western boundary currents in the region. The hydrodynamic processes are thus important factors in the distribution and dynamics of DOC in the KE region.

Sign in / Sign up

Export Citation Format

Share Document