Impact of Kuroshio on the dissolved oxygen in the East China Sea region

Zuo, Jiane; Song, Jinming; Yuan, Huamao; Li, Xuegang; Li, Ning; Duan, Liqin

doi:10.1007/s00343-019-7389-5

Cited by 17 publications

(10 citation statements)

References 41 publications

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“…Hypoxia, usually with acidification of the seawaters (Wei et al, 2017b(Wei et al, , 2020, generally occurs in the coastal seas neighboring the 30 m isobath over the shelf. It strengthens from the late spring to summer (Zuo et al, 2019) and peaks in August (Zhu et al, 2011(Zhu et al, , 2017. There are also observations showing that the hypoxia can occasionally last longer to the midautumn (Wang et al, 2012;Chen C. C. et al, 2020).…”

Section: Impacts Of Circulation On Hypoxia Off the Changjiang Estuarymentioning

confidence: 92%

“…The buoyant plume from Changjiang exports huge amounts of dissolved inorganic nitrogen (∼5,896 Gg N/yr), phosphate (∼381 Gg P/yr) (Gao et al, 2008(Gao et al, , 2012Tong et al, 2017;Liu et al, 2018) and sediments (∼250 million tons/year) (Yang et al, 2006(Yang et al, , 2015 into the ECS. As shown in Figure 6, the nutrients from Changjiang discharge, together with those intruding into the ECS through the Taiwan Strait (Huang et al, 2019) and from the Kuroshio (Chen et al, 1995;Chen, 1996;Lui et al, 2015;Qian et al, 2017;Zhang et al, 2019c;Zuo et al, 2019), played critical roles in stimulating the phytoplankton bloom (Li et al, 2014a;Yu et al, 2018), eutrophication and hypoxia in the coastal water. Chen et al (2017) proposed that hypoxia usually occurs in the bottom waters in the eutrophication area with the concentration of surface chlorophyll-a exceeds 3.0 mg L −1 .…”

Section: Impacts Of Circulation On Hypoxia Off the Changjiang Estuarymentioning

confidence: 99%

“…Kuroshio intrusion mainly regulates the hypoxia by increasing the residence time of the bottom coastal waters (from ∼11 to ∼40 days) in summer (Zhang et al, 2019c). However, the intrusion also alleviates the hypoxia through carrying shelf waters with a higher concentration of dissolved oxygen (Luo et al, 2018;Zuo et al, 2019). It is also found that the incoming Kuroshio waters is deoxygenating and acidifying (Lui et al, 2015).…”

Section: Impacts Of Circulation On Hypoxia Off the Changjiang Estuarymentioning

confidence: 99%

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Advances on Coastal and Estuarine Circulations Around the Changjiang Estuary in the Recent Decades (2000–2020)

Liu

Gan

et al. 2021

Front. Mar. Sci.

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Advances on the circulation in the Changjiang Estuary and adjacent East China Sea (ECS) and Yellow Sea (YS) coastal waters in the recent decades (2000–2020) are synthesized in this review. The circulation over the complicated bathymetry in the region is locally driven by winds, tides, as well as riverine discharge, and is remotely influenced by shelf currents between the 50 and 100-m isobaths through the cross-shelf exchanges. The interchange of the momentum and the freshwater pathway inside the Changjiang Estuary are jointly determined by tides and seasonally varying discharge and winds over the shelf. The buoyant waters are trapped inside the bulge that forms and expands over the shelf to the west of the 30-m isobath in the vicinity of Hangzhou Bay and the Changjiang Estuary. These buoyant waters are exported offshore by the shelf current, tidal mixing, and variations of wind patterns, forming the Changjiang River plume, which shows notable seasonality due to the reversal of both winds and shelf currents in the ECS and YS. Extensive spatial irregularities in the form of freshwater patches are present along its pathway to the Tsushima Strait in summer and to the Taiwan Strait in winter, respectively. Tides and the bathymetry irregularity have recently been found to play critical roles in determining the cross-shelf exchanges of water mass and momentum along the pathway of the ECS coastal current, and along this pathway, a year-round upslope intrusion of shelf waters appears in both summer and winter. Tides also play an important role in altering the expansion of the Changjiang River plume, cross-shelf extrusion of waters, and variation in the Yellow Sea Coastal Current over the shallow Subei Shoal.

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Section: Impacts Of Circulation On Hypoxia Off the Changjiang Estuarymentioning

confidence: 92%

Section: Impacts Of Circulation On Hypoxia Off the Changjiang Estuarymentioning

confidence: 99%

Section: Impacts Of Circulation On Hypoxia Off the Changjiang Estuarymentioning

confidence: 99%

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Advances on Coastal and Estuarine Circulations Around the Changjiang Estuary in the Recent Decades (2000–2020)

Liu

Gan

et al. 2021

Front. Mar. Sci.

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“…The East China Sea (ECS) is a marginal sea in the western Pacific Ocean that has a vast shallow continental shelf (Figure 1). The Yangtze River carries a large volume of terrestrial material into the ECS, and the southeastern ECS is strongly affected by the warm Kuroshio current [11,12]. The ECS circulation is influenced by the East Asian monsoon: Northerly winds prevail in winter, while southerly winds prevail in summer [13].…”

Section: Introductionmentioning

confidence: 99%

Unusual Fish Assemblages Associated with Environmental Changes in the East China Sea in February and March 2017

Ding

Zhang

et al. 2021

Remote Sensing

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Two large fish assemblages were recorded in the overwintering fishing grounds of the East China Sea in February and March 2017. In this study, available time series of satellite-derived sea surface temperature, wind, chlorophyll a, and reanalysis data were used to explore the relationships between the observed large fish aggregations and environmental factors. The bottom waters of the fishing grounds were abnormally warm in winter 2017, and then experienced significant cooling due to the eastward movement of the Yellow Sea Cold Current, which was driven by the increased northwesterly wind from January to mid-March 2017. Fishing areas in the affected region, including No. 1891, which was abnormally warm, and No. 1592, which had a strong thermal front and high chlorophyll a concentration, might have provided suitable environments for the warm-temperature fish, resulting in the observed large fish assemblages. The abnormal temperature changes between winter and early spring 2017 may have been associated with changes in local ocean circulation.

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“…However, hypoxic area has been expanded in recent decades (Chen et al, 2017;Ning et al, 2011;Zhu et al, 2011), which can be mostly related to the eutrophication (Wang et al, 2016). A low DO zone off the estuary can be found from spring (Zuo et al, 2019) until decay of stratification in autumn (Wang et al, 2012). The formation and maintenance of seasonal hypoxia has been related to various physical, biogeochemical and biological processes (Ning et al, 2011).…”

Section: Introduction 45mentioning

confidence: 99%

Wind-driven stratification patterns and dissolved oxygen depletion in the area off the Changjiang (Yangtze) Estuary

Liblik

Fan

2019

Preprint

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Abstract. The area off the Changjiang Estuary is under strong impact of fresh water and anthropogenic nutrient load from the Changjiang River. The seasonal hypoxia in the area has variable location and range, but the decadal trend reveals expansion and intensification of the dissolved oxygen (DO) depletion. Two oceanographic cruises, conducted in summer 2015 and 2017, revealed very different stratification and DO conditions in the area. Strongly inclined oxycline well correlated with the thermocline in both years. Southerly wind caused reversal of the Chinese Coastal Current and as a result, spreading of the CDW (Changjiang Diluted Water) caused pronounced hypoxic zone in the area east and northeast of the river mouth in 2017. Hypoxic layer started right below the CDW layer at 5&#8211;8&#8201;m depth and extended down to bottom. Strong DO depletion was also observed in the shallow coastal slope in the southern part of the study area. High DO utilization there closely coincided with the interaction zone of the upwelling and fresher surface water. The stratification and hypoxia pattern observed in the area in 2017 is prevailing phenomena during summers if considering the long-term wind statistics. Northeasterly winds supported southward transport of the CDW before the survey in 2015. Consequently, low DO was found in the southern part of the study area while subsurface layer in the northern part was ventilated. Weaker than long-term average summer monsoon is required for the existence of such pattern. Importance of the wind forcing was confirmed by remotely sensed sea surface salinity fields and by circulation simulation. We suggest wind forcing, together with river run-off are likely main contributors of determining the synoptic, seasonal and inter-annual time scale variations of the extent and location of low DO areas off the Changjiang Estuary.

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Impact of Kuroshio on the dissolved oxygen in the East China Sea region

Cited by 17 publications

References 41 publications

Advances on Coastal and Estuarine Circulations Around the Changjiang Estuary in the Recent Decades (2000–2020)

Advances on Coastal and Estuarine Circulations Around the Changjiang Estuary in the Recent Decades (2000–2020)

Unusual Fish Assemblages Associated with Environmental Changes in the East China Sea in February and March 2017

Wind-driven stratification patterns and dissolved oxygen depletion in the area off the Changjiang (Yangtze) Estuary

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