Variation of turbidity and particle transport in the bottom layer of the East China Sea

Hoshika, Akira; Tanimoto, Terumi; Mishima, Yasuo; Iseki, Kazuo; Okamura, Kazumaro

doi:10.1016/s0967-0645(02)00462-9

Cited by 55 publications

(37 citation statements)

References 8 publications

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“…8) (Tanaka et al 1987, Tanaka 1992. The turbidity increases greatly below the seasonal pycnocline during spring to late summer (Milliman et al 1985, Tanaka et al 1987, Hoshika et al 2003 (Fig. 8), while it mixes vertically from surface to bottom in winter due to both tides and storms (Hoshika et al 2003).…”

Section: Distribution In the Shelf Regionmentioning

confidence: 89%

“…The sediments are resuspended by the strong tidal current near the bottom (up to ca. 0.4 to 0.6 m s -1 ), producing highly turbid waters (Tanaka et al 1987, Yanagi & Inoue 1994, Hoshika et al 2003. The highly turbid waters in the bottom layer are found between 30°and 32°N and between 124°and 126°E over the mud shelf region (Fig.…”

Section: Distribution In the Shelf Regionmentioning

confidence: 98%

“…This might be related to the seasonal change of turbidity in the water column. During autumn to winter, the turbidity tends to increase throughout the water column in the NECS shelf, due to the seasonal vertical mixing (Milliman et al 1985, Tanaka 1992, Hoshika et al 2003, and the dim light conditions would be formed in a wide area of the shelf region. On the other hand, during spring to summer, the water column is stratified and highly turbid waters are found mainly in the bottom layer in the area south of Cheju Island where the bottom sediments are mainly composed of mud or clay (Tanaka et al 1987) (Fig.…”

Section: Distribution In the Shelf Regionmentioning

confidence: 99%

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Spatio-temporal distribution and biomass of Benthosema pterotum (Pisces: Myctophidae) in the shelf region of the East China Sea

Sassa¹,

Tsukamoto²,

Yamamoto³

et al. 2010

Mar. Ecol. Prog. Ser.

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We examined the spatio-temporal distribution and biomass of Benthosema pterotum, a dominant mesopelagic-boundary myctophid in the shelf region of the East China Sea, based on data from seasonal bottom-trawl surveys. They are a major prey item for commercially important demersal fishes in this area. A total of 980 000 individuals with a wet weight of 554 kg were collected from 694 bottom-trawl net samples. Dense distributions (>10 5 ind. km -2) of B. pterotum were observed mainly in the area south of Cheju Island in all seasons, where a persistent cyclonic eddy occurs. The distribution pattern indicated the presence of an independent population completing their life cycle in the area south of Cheju Island. Daytime habitat depth of B. pterotum (mainly 40 to 90 m depth) was a markedly shallower depth than previous reports for adult fishes for the family Myctophidae. The mechanism of population maintenance of this mesopelagic species in such a shallow area was hypothesized to be related to the presence of highly turbid waters in the benthopelagic layer, which produces dim light conditions during the daytime. The biomass of B. pterotum in the area south of Cheju Island was estimated to range from 3900 to 38 400 t.KEY WORDS: Population maintenance · Mesopelagic-boundary myctophid · Benthosema pterotum · Biomass · Highly turbid waters · Continental shelf region · Mesopelagic species Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 407: [227][228][229][230][231][232][233][234][235][236][237][238][239][240][241] 2010 The biomass of myctophids was shown to influence the population dynamics of demersal fishes in the continental slope off northern Japan (Yamamura & Inada 2001).Benthosema pterotum is a typical mesopelagicboundary myctophid, widely distributed in the subtropical-tropical waters of the Indo-West Pacific, especially over or near the continental shelves (Gjøsaeter 1984, Valinassab et al. 2007, Yamada et al. 2007). They are small-sized, with a maximum body size of ca. 55 mm standard length (SL), and have a life cycle of 1 yr (Gjøsaeter 1984, Dalpadado 1988). An extremely large biomass of B. pterotum (ca. 100 million t) was estimated in the Arabian Sea, and attempts were made to evaluate its potential as a fisheries resource (Gjøsaeter 1984, Valinassab et al. 2007). This species is one of the most abundant myctophids in the East China Sea (ECS), one of the largest marginal seas of the western Pacific, including important fishing grounds for various pelagic and demersal fishes (Seikai National Fisheries Research Institute 2001, Yamada et al. 2007).In the ECS, Benthosema pterotum occur in the epipelagic layer during the larval stage (Ozawa 1986, C. Sassa unpubl. data). Transformation to the juvenile stage begins at ca. 12 to 13 mm SL, after which they start diel vertical migrations (Gjøsaeter 1984, Ozawa 1986. The juveniles and adults occur in the epipelagic layer at night, and descend to the benthopelagic layer of the continental shelf (< 200 m depth) dur...

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Section: Distribution In the Shelf Regionmentioning

confidence: 89%

Section: Distribution In the Shelf Regionmentioning

confidence: 98%

Section: Distribution In the Shelf Regionmentioning

confidence: 99%

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Spatio-temporal distribution and biomass of Benthosema pterotum (Pisces: Myctophidae) in the shelf region of the East China Sea

Sassa¹,

Tsukamoto²,

Yamamoto³

et al. 2010

Mar. Ecol. Prog. Ser.

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“…High turbid water is constantly seen near the bottom in a wide area of the shelf 20,23 . This bottom turbid layer is developed most strongly in summer to fall and coincides with seasonal changes in SPM load from the Changjiang 6 . Sediment trap experiments revealed that the vertical flux of SPM in the shelf was related to the Changjiang discharge, primary productivity and development of the bottom turbid layer, but the highest flux in the Okinawa Trough was observed in winter when the Changjiang discharge and the primary productivity is low 8 .…”

Section: Suspended Particulate Mattermentioning

confidence: 78%

A Possible Collaboration with China on Marine Ecosystem Research in the East China Sea

Takayanagi¹,

Nishiuchi²,

Yokouchi

et al. 2006

JARQ

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The East China Sea is a productive sea. Its annual total fishery production including the Yellow Sea is about 9.2 million tons, about 10% of the world's total fishery production. For a sustainable development and wise use of natural resources in the East China Sea, cooperative international programs on marine ecosystem research among surrounding countries, China, Korea, Taiwan and Japan, are necessary. In this review paper, published papers and reports on the East China Sea are summarized and possible collaborative researches with the surrounding countries, especially with China, are sought.

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“…It has been demonstrated that in modern times, offshore export of particles in the bottom nepheloid layer occurs primarily with downwelling and seaward bottom fl ow induced by the northeast winter monsoon, which is inhibited by a transverse circulation pattern in summer (Yang et al, 1992;Yanagi et al, 1996;Yuan et al, 2008). Although there is a bottom nepheloid layer in the shelf area in summer, it contributes less to the Okinawa Trough because of resistance of the Taiwan Warm Current and a "water barrier" engendered by Kuroshio subsurface-intermediate water (Yang et al, 1992;Hoshika et al, 2003;Iseki et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system

Zheng

Wan

et al. 2015

Chin. J. Ocean. Limnol.

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The Okinawa Trough is a natural laboratory for the study of air-sea interaction and paleoenvironmental change. It has been demonstrated that present offshore export of particles in the bottom nepheloid layer occur primarily with downwelling from the northeast winter monsoon, which is inhibited by a transverse circulation pattern in summer. This current system was very different during the Last Glacial Maximum owing to low sea level (-120 m) and exposure of a large shelf area. We collected sediment core Oki01 from the middle Okinawa Trough during 2012 using R/V Kexue No . 1 to elucidate the timing and cause of the current system transition in the East China Sea. Clay mineral, dry density, and elemental (Ti, Ca) composition of core Oki01 was analyzed. The results indicate that clay minerals derived mainly from the Huanghe (Yellow) and the Changjiang (Yangtze) Rivers during 16.0-11.6 ka, and the modern current system in the East China Sea formed beginning in the early Holocene. Therefore, mixing of East China Sea continental shelf, Changjiang River and partially Taiwan Island sediment are the major contributors. The decrease of log(Ti/Ca) and alternating provenance since the early Holocene indicate less sediment from the East China in summer because of resistance of the modern current system, i.e., a "water barrier" and upwelling. Conversely, sediment delivery persists in winter and log(Ti/Ca) indicates the winter monsoon signal since the early Holocene. Our evidence also suggests that sediment from Taiwan Island could be transported by the Kuroshio Current to the middle Okinawa Trough, where it mingles with winter monsooninduced export of sediment from the Changjiang River and East China Sea continental shelf. Although the present research advances understanding of the evolutionary history of paleoenvironmental change in the Okinawa Trough, more sediment cores should be retrieved over wide areas to construct a larger scenario.

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Variation of turbidity and particle transport in the bottom layer of the East China Sea

Cited by 55 publications

References 8 publications

Spatio-temporal distribution and biomass of Benthosema pterotum (Pisces: Myctophidae) in the shelf region of the East China Sea

Spatio-temporal distribution and biomass of Benthosema pterotum (Pisces: Myctophidae) in the shelf region of the East China Sea

A Possible Collaboration with China on Marine Ecosystem Research in the East China Sea

Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system

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