Episodic surface intrusions in the <scp>Y</scp>ellow <scp>S</scp>ea during relaxation of northerly winds

Hu, Zi‐Min; Wang, Dong-Ping; He, Xianqiang; Li, Mingting; Wei, Jiangong; Pan, Delu; Bai, Yan

doi:10.1002/2017jc012830

Cited by 24 publications

(22 citation statements)

References 48 publications

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“…The basin-scale synoptic variation of YSWC is associated with a counterclockwise rotary wave response to the strong northerly wind bursts. The rotary wave had been indicated in the results of Hsueh et al (1986) and Hu et al (2017). Strong northerly wind burst pushes water in the Bohai Sea move southward and forms a northward SSH drop.…”

Section: Discussionmentioning

confidence: 90%

The synoptic variation of Yellow Sea Warm Current in winter and its mechanisms

Huang

Xing

et al. 2019

HFF

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Purpose This paper aims to investigate the basin-scale features and mechanisms of the synoptic variation of Yellow Sea Warm Current (YSWC) in winter. Design/methodology/approach Both in situ current observation and numerical model (MITgcm) were conducted to investigate the synoptic variation of YSWC. The model was well validated and the simulated results were analyzed. Findings The YSWC shows a much stronger synoptic variation than its mean in winter with strong variation mainly in the deep central YS. The synoptic variation of YSWC is associated a counterclockwise rotary wave as a response to the strong northerly wind bursts. Strong northerly wind generates a large sea surface height (SSH) drop in the Bohai Sea and northern YS. Then, the SSH rotates in a counterclockwise manner. About 18 h later, strong eastward SSH gradient is formed, generating a northward current through geostrophic balance. Originality/value The mechanisms analysis shows that the synoptic variation of YSWC is intrinsically linked to SSH as a response to the synoptic varying winter monsoon. This study provides an insight into the spatial and temporal evolution of the oceanic response to strong northerly wind in winter.

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Section: Discussionmentioning

confidence: 90%

The synoptic variation of Yellow Sea Warm Current in winter and its mechanisms

Huang

Xing

et al. 2019

HFF

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“…The spring‐neap tidal variation is normally a factor that affects the current intensity, but this variation is too weak in the Bohai Sea to change the seasonal water circulation (Wang et al, ), let alone the entirely different winter pattern in this study (Figure a). The local winds are therefore assumed to be a major force in driving currents and waves, setting up ΔMSL and even changing the regional circulation, especially in winter (Hu et al, ; Wang et al, ; Zhang et al, ; Zhao & Shi, ). Furthermore, the episodic wind reversal before and during the winter PAM cruise was likely the major reason for the atypical water intruding into the Bohai Sea (Figure a).…”

Section: Discussionmentioning

confidence: 99%

“…This monthly or seasonal pattern has been verified by moorings and models and widely used in estimating the long‐term sediment transport through the Bohai Strait (e.g., Bi et al, ; Bian et al, ). However, recent studies illustrates that the path and strength of the YSWC are sensitive to the synoptic events, such as typhoons, winter storms, and episodic wind relaxations (Ding et al, ; Hu et al, ; Wu et al, ). As the major flow into the Bohai Sea, whether such changes in the YSWC affect the sediment exchange through the Bohai Strait remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Novel, Repeated Surveys Reveal New Insights on Sediment Flux Through a Narrow Strait, Bohai, China

Wang

et al. 2019

JGR Oceans

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Straits are both a choke point and passage through which material and energy are exchanged between two adjoining water bodies. Understanding the mechanisms that drive these exchanges therefore is vital to quantifying the water and sediment budgets in regional and global oceans. Here we present a study in which a novel, phase‐averaging method was employed to better estimate the net‐suspended sediment fluxes through the entire Bohai Strait, the only passage for the massive Yellow River‐delivered sediment to leave the enclosed Bohai Sea for the open Yellow Sea. In winter, the transport through the strait was nearly barotropic in waters well mixed by the energetic winter monsoons. The transport became primarily baroclinic (opposite directions between upper and lower layers) in spring due to stratification, especially in the southern part of the strait. Intermittent but frequent southerly winds in northerly dominated winters were responsible for a net westward sediment transport into the Bohai Sea, a finding contrary to a status quo view. Hence, previous studies in which these intermittent southerly wind busts were not included are believed to have overestimated the sediments export from the Bohai Sea.

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“…In winter, the Yellow Sea Warm Current (YSWC) has been widely studied because of its prominent hydrographic and upwind features (Hsueh, ; Huang et al, ; Lin & Yang, ; Tak et al, ). The YSWC significantly influences frontal circulation and the heat and water exchange in the Yellow Sea (Lie et al, , ; Pang et al, ), and its synoptic variation has been studied with numerical models in recent years (Ding et al, ; Hu et al, ; Li et al, ). These studies showed that after a strong northerly wind burst, a strong northward YSWC forms in the Yellow Sea trough and is associated with large‐scale SSH variations.…”

Section: Discussionmentioning

confidence: 99%

Sea Surface Height and Current Responses to Synoptic Winter Wind in the Bohai, Yellow, and East China Seas: Two Leading Coastal Trapped Waves

Huang

2019

JGR Oceans

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This study investigates the sea surface height (SSH) and current responses to synoptic winter wind in the Bohai, Yellow, and East China Seas (BYES) using a numerical model. The basin‐scale responses are primarily interpreted as two leading coastal trapped waves (CTWs) identified through the complex empirical orthogonal function analysis of SSH. One CTW is a Kelvin wave (KW) explaining 76% of the total SSH variance; the other is a wind‐forced lowest shelf wave (SW1) explaining 17% of the total SSH variance. The KW dominates the current in the Bohai and Yellow Seas (BYS), and the SW1 dominates the current in the western East China Sea (ECS). The KW is a free relaxation response to large wind‐driven SSH variations and propagates cyclonically in the BYES around one SSH node. The SW1 propagates cyclonically in the semienclosed BYS around two nodes and southward along the western ECS with two nodes on the shelf. The wavelength and e‐folding scale of amplitude vary spatially, producing regionally distinct features and mechanisms. In the semienclosed BYS, the associated geostrophic current is along the cophase line of SSH, and its magnitude is proportional to both wave amplitude and wavenumber. In the western ECS, the associated geostrophic current is perpendicular to the cophase line of SSH, and its magnitude is proportional to the wave amplitude and inversely proportional to the e‐folding scale of amplitude. This study reveals not only the basin‐scale SSH and current variations in the BYES but also new features of CTWs in a semienclosed embayment.

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Episodic surface intrusions in the Yellow Sea during relaxation of northerly winds

Cited by 24 publications

References 48 publications

The synoptic variation of Yellow Sea Warm Current in winter and its mechanisms

The synoptic variation of Yellow Sea Warm Current in winter and its mechanisms

Novel, Repeated Surveys Reveal New Insights on Sediment Flux Through a Narrow Strait, Bohai, China

Sea Surface Height and Current Responses to Synoptic Winter Wind in the Bohai, Yellow, and East China Seas: Two Leading Coastal Trapped Waves

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