Terrigenous transportation to the Okinawa Trough and the influence of typhoons on suspended sediment concentration

Bian, Changwei; Jiang, Wensheng; Song, Dehai

doi:10.1016/j.csr.2010.03.008

Cited by 84 publications

(38 citation statements)

References 18 publications

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“…Similar to the late stage in Unit 2, most detrital sediments derived from these rivers were deposited on the East China Sea shelf, especially in the Huanghe and the Changjiang deltas (Dou et al, 2012;Hori et al, 2002;Hu et al, 2014;Li et al, 2002;Liu et al, 2004Liu et al, , 2007b. This should be correlated to the highest sea level, and then the longest distance from the modern river mouths to the study area as well as blocking effects from the newly formed Tsushima Warm Current and Yellow Sea Warm Current (e.g., Bian et al, 2010;Liu et al, 2004Liu et al, , 2007bXu et al, 2014a). Therefore, Unit 1 sediments are characterized by the lowest values of detrital elements (Ti, Nb, and Th) and linear sedimentation rate as well as the finest sediment grain sizes (Fig.…”

Section: Paleoenvironmental Significance Of Detrital Sediment Provenamentioning

confidence: 97%

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

Lim

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Paleoenvironmental Significance Of Detrital Sediment Provenamentioning

confidence: 97%

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

Lim

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Interdisciplinary studies in sedimentology, geochemistry/biogeochemistry, mineralogy and physical oceanology concur that sediments in the Okinawa Trough are mainly terrigenous; however, dispute persists concerning the sediment origin and transport mechanisms Hsu et al, 2004;Lee et al, 2004;Kao et al, 2005;Yuan et al, 2008;Bian et al, 2010;Dou et al, 2010). Some scholars believe that a large volume of sediments from eastern Taiwan Island could be transported by the KC to the southern Okinawa Trough, even dispersing further north into the middle and northern part of the trough (Hsu et al, 2004;Lee et al, 2004;Dou et al, 2012).…”

Section: Clay Mineral and Provenance Implicationmentioning

confidence: 95%

“…In summer, low pressure above the central Eurasian continent favors southeasterly winds around 5 m/s that carry warm and moist air from the Pacifi c Ocean toward Taiwan Island and mainland China (Bian et al, 2010;Zheng et al, 2014a). In winter, a reversed pressure gradient favors northwesterly winds around 12 m/s, bringing cool and dry air from the Eurasian continent toward the Pacifi c (Bian et al, 2010;Zheng et al, 2014a). Seasonal variation of the monsoon system strongly infl uences hydrographic conditions and the KC in the Okinawa Trough (Lee and Chao, 2003;Diekmann et al, 2008;Yuan et al, 2008;Yuan and Hsueh, 2010).…”

Section: Oceanographic Settingmentioning

confidence: 97%

“…The climate in the study area is infl uenced by the East Asian monsoon system, which modulates local temperature, humidity, and atmospheric circulation (Lee and Chao, 2003). In summer, low pressure above the central Eurasian continent favors southeasterly winds around 5 m/s that carry warm and moist air from the Pacifi c Ocean toward Taiwan Island and mainland China (Bian et al, 2010;Zheng et al, 2014a). In winter, a reversed pressure gradient favors northwesterly winds around 12 m/s, bringing cool and dry air from the Eurasian continent toward the Pacifi c (Bian et al, 2010;Zheng et al, 2014a).…”

Section: Oceanographic Settingmentioning

confidence: 98%

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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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“…A previous study [11] has suggested the existence of five optically distinct water classes found in the coastal area of Hong Kong (Figure 1). Different studies [4,12,13] have reported the role of chlorophylla (Chl-a) and suspended solids (SS) in aquatic ecosystem health, tourism, shipping, and fisheries, which can be enhanced if estimations of Chl-a and SS are obtained with high accuracy. Additionally, accuracy becomes more important for complex water bodies, such as the South China Sea, which experiences a high volume of pollutants and storm water runoff from the Pearl River Delta.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Empirical and Machine Learning Algorithms for Estimation of Coastal Water Quality Parameters

Nazeer

Bilal

Alsahli

et al. 2017

IJGI

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Abstract:Coastal waters are one of the most vulnerable resources that require effective monitoring programs. One of the key factors for effective coastal monitoring is the use of remote sensing technologies that significantly capture the spatiotemporal variability of coastal waters. Optical properties of coastal waters are strongly linked to components, such as colored dissolved organic matter (CDOM), chlorophyll-a (Chl-a), and suspended solids (SS) concentrations, which are essential for the survival of a coastal ecosystem and usually independent of each other. Thus, developing effective remote sensing models to estimate these important water components based on optical properties of coastal waters is mandatory for a successful coastal monitoring program. This study attempted to evaluate the performance of empirical predictive models (EPM) and neural networks (NN)-based algorithms to estimate Chl-a and SS concentrations, in the coastal area of Hong Kong. Remotely-sensed data over a 13-year period was used to develop regional and local models to estimate Chl-a and SS over the entire Hong Kong waters and for each water class within the study area, respectively. The accuracy of regional models derived from EPM and NN in estimating Chl-a and SS was 83%, 93%, 78%, and 97%, respectively, whereas the accuracy of local models in estimating Chl-a and SS ranged from 60-94% and 81-94%, respectively. Both the regional and local NN models exhibited a higher performance than those models derived from empirical analysis. Thus, this study suggests using machine learning methods (i.e., NN) for the more accurate and efficient routine monitoring of coastal water quality parameters (i.e., Chl-a and SS concentrations) over the complex coastal area of Hong Kong and other similar coastal environments.

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Terrigenous transportation to the Okinawa Trough and the influence of typhoons on suspended sediment concentration

Cited by 84 publications

References 18 publications

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

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

Evaluation of Empirical and Machine Learning Algorithms for Estimation of Coastal Water Quality Parameters

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