Thermal and haline fronts in the Yellow/East China Seas: Surface and subsurface seasonality comparison

Park, Sunghyea; Chu, Peter C.

doi:10.1007/s10872-006-0081-3

Cited by 59 publications

(44 citation statements)

References 41 publications

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“…The distribution pattern of SST and SSS in winter is generally similar to that in autumn, increasing in an eastwardly direction. In general, the observed seasonal distributions of SST and SSS corresponded well to the seasonal circulation pattern in the ECS (Lee and Chao, 2003), and they were consistent with those reported in the previous studies (Chen et al, 2006;Park and Chu, 2006). During the wet season (May to October), when the Changjiang is in flood, the mixing of freshwater and shelf seawater forms the Changjiang diluted water (CDW), which is characterized by low salinity and high nutrient content (Gong et al, 1996).…”

Section: Seasonal Variations Of Surface Water Temperature Salinity Asupporting

confidence: 89%

Seasonality of CO<sub>2</sub> in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system

et al. 2013

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Abstract. Model studies suggested that human-induced increase in nutrient load may have stimulated primary production and thus enhanced the CO2 uptake capacity in the coastal ocean. In this study, we investigated the seasonal variations of the surface water's partial pressure of CO2 (pCO2sw) in the highly human-impacted Changjiang–East China Sea system between 2008 and 2011. The seasonality of pCO2sw has large spatial variations, with the largest extreme of 170 ± 75 μatm on the inner shelf near the Changjiang Estuary (from 271 ± 55 μatm in summer to 441 ± 51 μatm in autumn) and the weakest extreme of 53 ± 20 μatm on the outer shelf (from 328 ± 9 μatm in winter to 381 ± 18 μatm in summer). During the summer period, stronger stratification and biological production driven by the eutrophic Changjiang plume results in a very low dissolved inorganic carbon (DIC) in surface waters and a very high DIC in bottom waters of the inner shelf, with the latter returning high DIC to the surface water during the mixed period. Interestingly, a comparison with historical data shows that the average pCO2sw on the inner shelf near the Changjiang Estuary has decreased notably during summer, but has increased during autumn and winter from the 1990s to the 2000s. We suggest that this decadal change is associated with recently increased eutrophication. This would increase both the photosynthetic removal of DIC in surface waters and the respiratory release of DIC in bottom waters during summertime, thereby returning more DIC to the surface during the subsequent mixing seasons and/or episodic extreme weather events (e.g., typhoons). Our finding demonstrates that increasing anthropogenic nutrient delivery from a large river may enhance the sequestration capacity of CO2 in summer but may reduce it in autumn and winter. Consequently, the coastal ocean may not necessarily take up more atmospheric CO2 in response to increasing eutrophication, and the net effect largely depends on the relative timescale of air–sea gas exchange and offshore transport of the shelf water. Finally, the case we report for the Changjiang system may have general ramifications for other eutrophic coastal oceans.

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Section: Seasonal Variations Of Surface Water Temperature Salinity Asupporting

confidence: 89%

Seasonality of CO<sub>2</sub> in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system

et al. 2013

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“…However, the frontal structure and circulation are still poorly understood, mainly because of limited hydrographic and current measurements in the frontal zone. Climatological charts of temperature and salinity and sea surface temperature deduced from satellite imagery indicate clearly the persistence of the front during the winter monsoon [ Zheng and Klemas , ; Lie , ; Chen and Editorial Board , ; Ichikawa and Beardsley , ; Park and Chu , ; Huang et al ., ; Wang et al ., ]. The density front around the warm tongue is not so distinct as the temperature and salinity fronts, because in the frontal zone the temperature contribution to density is compensated by the salinity contribution [ Lie , ].…”

Section: Introductionmentioning

confidence: 99%

Frontal circulation and westward transversal current at the Yellow Sea entrance in winter

2013

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[1] During the wintertime monsoon, a tongue-shaped thermohaline front is established at the Yellow Sea (YS) entrance where the Cheju Warm Current (CWC) water, originating in the Kuroshio, and the YS cold water meet. The frontal circulation as well as the frontal structure has been investigated by analyzing comprehensive conductivity-temperaturedensity data, float tracks, current data, and wind data. The front develops by the westward advance of the CWC water, but it is bounded by the shallow Changjiang Banks (CB) that acts like a stopper in the deep part of the YS entrance. The northern part of the tongueshaped front displays a wave-like motion of 20 km in amplitude and 80 km in wavelength and isotherms, isohalines, and isopycnals are declined downward toward the north. The geostrophic current field indicates formation of a cyclonic circulation along the front which consists of a westward transversal current (TC) along 34 N and a southeastward outflow along the 50 m isobath of the CB. The westward trajectories of floats along the northern front support existence of the TC and a superposition of float tracks evidences cyclonic frontal circulation. The new observational findings of the TC and the cyclonic circulation do not match the classical paradigm of a northerly wind-driven circulation which consists of the northward inflow through the central trough and the southward outflow on the coastal sides. The cyclonic turning of the cold water around the warm tongue stands in contrast with the anticyclonic rounding of the warm CWC water around Jeju-do.

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“…And during the period from April to June, GM in the area of 124°-128°E is bigger. The double structure of Kuroshio Front was also indicated in the other researches such as Park and Chu's model results [22].…”

Section: Monthly Variationsmentioning

confidence: 58%

Analysis of sea surface temperature fronts in the Taiwan Strait and its adjacent area using an advanced edge detection method

Qing-ling

2010

Sci. China Earth Sci.

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A morphology-based edge detection method has been used to study sea surface temperature (SST) fronts in the Taiwan Strait and its adjacent area. The method is based on mathematical morphology with multi-dimensional and multi-structural elements. Using six years' SST data from September 2002 to August 2008, we distinguished the large SST front like Kuroshio Front as well as the smaller ones: namely Taiwan Bank Front, Zhe-Min Coastal Front and Zhang-Yun Ridge Front. The seasonal and monthly variations of these fronts were also studied. Generally, the SST fronts are stronger in winter but weaker in summer. And the fronts are at their active stage during the period from January to May but at their declining stage during the period from July to October.National Basic Research Program of China [2007CB411803, 2009CB421208]; National Natural Science Foundation of China [40576015, 40821063, 40810069004

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Thermal and haline fronts in the Yellow/East China Seas: Surface and subsurface seasonality comparison

Cited by 59 publications

References 41 publications

Seasonality of CO<sub>2</sub> in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system

Seasonality of CO<sub>2</sub> in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system

Frontal circulation and westward transversal current at the Yellow Sea entrance in winter

Analysis of sea surface temperature fronts in the Taiwan Strait and its adjacent area using an advanced edge detection method

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Thermal and haline fronts in the Yellow/East China Seas: Surface and subsurface seasonality comparison

Cited by 59 publications

References 41 publications

Seasonality of CO&lt;sub&gt;2&lt;/sub&gt; in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system

Seasonality of CO&lt;sub&gt;2&lt;/sub&gt; in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system

Frontal circulation and westward transversal current at the Yellow Sea entrance in winter

Analysis of sea surface temperature fronts in the Taiwan Strait and its adjacent area using an advanced edge detection method

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Seasonality of CO<sub>2</sub> in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system

Seasonality of CO<sub>2</sub> in coastal oceans altered by increasing anthropogenic nutrient delivery from large rivers: evidence from the Changjiang–East China Sea system