Effect of coastal-trapped waves on the synoptic variations of the Yellow Sea Warm Current during winter

Ding, Yang; Bao, Xianwen; Yao, Zhigang; Song, Dehai; Song, Jun Yeob; Jia, Gao; Li, Junyi

doi:10.1016/j.csr.2018.08.003

Cited by 35 publications

(40 citation statements)

References 53 publications

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“…During propagation of the Kelvin wave, a strong eastward (westward) SSH gradient forms in the Yellow Sea, generating a strong northward (southward) current in the deep central Yellow Sea (Figure a). The northward current bursts observed in the deep central Yellow Sea (Ding et al, ; Hsueh, ; Lin et al, ; Teague & Jacobs, ) are actually associated with propagation of the free Kelvin wave.…”

Section: Discussionmentioning

confidence: 99%

“…The SSH and current responses to synoptic winter wind in the BYES have been recognized to be energetic based on data from several coastal tide gauge stations (Chen & Su, ; Ding et al, ; Hsueh & Romea, ; Yin et al, ) and some in situ current observations (Hsueh, ; Huang et al, ; Lin et al, ; Li et al, ; Teague & Jacobs, ; Yin et al, ). However, the basin‐scale SSH and current variations have not yet been fully revealed, possibly due to the limited spatial and temporal coverage of the observed data and the lack of an effective method to decompose the overall variations into several leading modes.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…The SSH and current responses to synoptic winter wind in the BYES have been recognized to be energetic based on data from several coastal tide gauge stations (Chen & Su, 1987;Ding et al, 2018;Hsueh & Romea, 1983;Yin et al, 2014) and some in situ current observations (Hsueh, 1988;Huang et al, 2016;Li et al, 2019;Teague & Jacobs, 2000;Yin et al, 2014). However, the basin-scale SSH and…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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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 is relevant at mid-to-high latitudes where storm-induced coastal dynamics is dominant. However, this can be different in the inter-tropical band where sea level presents large fluctuations at seasonal and interannual scales (Komar and Enfield 1987, Feng et al 2003, Ding et al 2009, Pattiaratchi and Eliot 2009, Komar et al 2011, and intraseasonal scales (Polo et al 2008, Echevin et al 2014, Ezer 2016, Ding et al 2018, Kim et al 2018. While the seasonal and interannual scales are related to the tropical climate modes, the intraseasonal variability is characterized by the poleward propagation of coastal disturbances triggered by coastally-trapped Kelvin and Rossby waves.…”

Section: Introductionmentioning

confidence: 99%

Beach adaptation to intraseasonal sea level changes

Ondoa

Almar

Jouanno

et al. 2020

Environ. Res. Commun.

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Coastal areas such as beaches with steep upper slope and flat low-tide terrace, are expected to be increasingly affected by sea level changes. Related impacts due to the paramount rise in sea level have been intensively investigated, but there is still little evidence of the impact of shorter timescales variations on the coast, particularly those induced by trapped coastal waves. Using the latest advances in video bathymetric estimation, daily observations over 3.5 years (February 2013 to June 2016) on Grand Popo Beach (West Africa) reveal that intraseasonal sea level variations impact the beach profile. The intraseasonal sea level variations are dominated by the propagation of wind forced coastal trapped waves with periods ranging 15-95 days. It is shown that the beach goes through a transient state with a deformation of the profile: an intraseasonal sea level rise leads to a 2 m erosion of the upper beach and a widening of the flat terrace at the lower beach. Although the underlying mechanism must be tested through beach profile modelling, this study highlights the active adaptation of the beach profile to variations in sea level.

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Drivers of marine heatwaves in the East China Sea and the South Yellow Sea in three consecutive summers during 2016-2018

Gao

Marin

Feng

et al. 2020

Preprint

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In 3 consecutive years from 2016 to 2018, extreme ocean warming events, or marine heatwaves (MHWs), occurred during boreal summers in the East China Sea (ECS) and South Yellow Sea (SYS), which is unprecedented in the past four decades based on the satellite record. In this study, we used a high-resolution hydrodynamic model based on Finite Volume Community Ocean Model (FVCOM) to simulate the evolution of these warming events. An upper ocean temperature budget (0-20 m) analysis based on the model results shows that the shortwave radiation and the ocean advection anomalies jointly contributed to the anomalous warming in the three successive summers (June-August) in the SYS and the north part of the ECS. In addition, the reduction of surface wind speeds during the 2016 and 2017 summers further weakened the vertical mixing, thereby enhancing the anomalous warming in the north part of the ECS adjacent to the SYS. During the three summers, the increases of shortwave radiation were closely related to the East Asian Summer Monsoon (EASM) variability, which reduced the cloud cover in the ECS and SYS, whereas the advection anomalies were mostly associated with regional wind anomalies. In summer 2018, upper ocean heat was transported into the central trough of the SYS, accumulated in an anticyclonic eddy generated by the anomalous wind stress curls. Therefore, despite the primary driver of the MHWs is the EASM variation, regional processes are critical to driving the spatial pattern of the MHW intensity in the ECS and SYS.Plain Language Summary Marine heatwaves, known as periods of extreme warming at the sea surface, can last for days to months and cause damages to the marine environment and marine life. In the East China Sea and the South Yellow Sea, the frequent occurrences of harmful algae blooms are often associated with marine heatwaves. Satellite data reveal that marine heatwaves occurred in the East China Sea and the South Yellow Sea during the three boreal summers from 2016 to 2018, which is unprecedented in the past four decades. Using a numerical model of the ocean, we examined the marine heatwaves during these three successive summers. We show that the increased solar radiation, ocean current anomalies, and reduced vertical mixing were three critical factors for the warming events in the three summers. This study helps the fisheries and aquaculture industries in the East China Sea and the South Yellow Sea to better manage the environmental risks under a warming climate by predictions of marine heatwaves.

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Effect of coastal-trapped waves on the synoptic variations of the Yellow Sea Warm Current during winter

Cited by 35 publications

References 53 publications

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

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

Beach adaptation to intraseasonal sea level changes

Drivers of marine heatwaves in the East China Sea and the South Yellow Sea in three consecutive summers during 2016-2018

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