Classifications and Characteristics of Marine Heatwaves in the Northern South China Sea

Wang, Yinxia; Zeng, Jing; Zheng, Wei; Li, Shan; Tian, Song; Yang, Fan; Chen, Qidong; He, Yinghui

doi:10.3389/fmars.2022.826810

Cited by 7 publications

(10 citation statements)

References 39 publications

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“…The cross‐slope mesoscale perturbations in the upper layer could trigger topographical Rossby waves and drive the strong intraseasonal variability in the deep layer (Shu, Xiu, et al., 2016; Shu, Xue, et al., 2016; Shu et al., 2022; Wang et al., 2019, 2021). In addition, active cross‐slope water exchange induced by the mesoscale eddy in the northern SCS continental shelf edge is a main oceanic way that cools the water on the shelf, eventually resulting in the decay of marine heat waves (Wang et al., 2022). The mesoscale eddies have also been confirmed to generate cross‐slope volume transport between the continent and the deep‐sea basin (e.g., Chen et al., 2012; Wang et al., 2013; Yang et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Cross‐Slope Heat and Salt Transport Induced by Slope Intrusion Eddy's Horizontal Asymmetry in the Northern South China Sea

Qiu

et al. 2022

JGR Oceans

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Material transport caused by mesoscale eddies has been revealed much in the open ocean; however, it is still unclear how much eddy‐induced mass transport in the slope region of the northern South China Sea (SCS). Using the LASG/IAP Climate System Ocean Model (LICOM) from 2007 to 2017, we identified 47 anticyclonic eddies and 97 cyclonic eddies that intruded onto the continental slope, termed slope intrusion eddies. The slope intrusion eddies are more horizontally asymmetric and energetic than those without entering the slope. These eddies induced cross‐slope heat and salt transport of O (1012) W and O (104) kg s−1 owing to their horizontal asymmetry in both Xisha Islands and Dongsha Islands, where are the intrusion zones of mesoscale eddies. Based on the potential vorticity budget, we found that the horizontal asymmetry of velocity was caused by the asymmetry of potential vorticity, which was mainly generated by eddy‐current nonlinear effect in the Dongsha Islands and topographic beta effect in the Xisha Islands, respectively. This study may promote our understanding on the mesoscale dynamics and oceanic energy redistribution in the continental shelf zone of marginal sea.

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Section: Introductionmentioning

confidence: 99%

Cross‐Slope Heat and Salt Transport Induced by Slope Intrusion Eddy's Horizontal Asymmetry in the Northern South China Sea

Qiu

et al. 2022

JGR Oceans

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“…The Xisha area, outlined by the black box, exhibited a relatively low frequency of SSMHWs, with an average relative value of 0.96 and an annual frequency of approximately 1.56 Counts/Year (Figure 3A). The frequency of SSMHWs near the South China Sea Throughflow significantly exceeded that in the surrounding regions, with the highest incidence observed to the east of Hainan Island (Wang et al, 2022). The average relative duration of SSMHWs was 1.04, with an average duration of approximately 22.98 Days/Count (Figure 3B).…”

Section: Spatial Distribution and Temporal Variation Of Ssmhwmentioning

confidence: 96%

“…In recent years, coral reef degradation caused by temperature anomalies in the Xisha area has been increasing (Zuo et al, 2023). Previous studies indicated that SMHWs are more prevalent in the northern SCS, particularly east of Hainan Island and the continental shelf waters, compared to the weaker SMHWs in the Xisha area (Tan et al, 2022;Wang et al, 2022). However, SSMHWs in areas where SMHWs are weak may not be equally weak (Hu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The spatiotemporal characteristics and driving mechanisms of subsurface marine heatwaves in the Xisha Region

Gao,

Liu,

Zhai

et al. 2024

Front. Mar. Sci.

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Under the background of global climate change, Subsurface Marine Heatwaves (SSMHWs) have become a ‘hot-spot’ research due to their significant impacts on marine ecosystems. Temperature data from the ECCO2 for the years 1992 to 2021 is used to research the spatiotemporal characteristics of SSMHWs in the upper 500 m over the Xisha region (110°E to 113°E, 15°N to 18°N). This study indicates that SSMHWs of high intensity occur in the Xisha area, with the vertical maximum intensity at approximately 100 m. These events exhibit significant seasonal variations, with the highest intensity occurring in May. The intensity of SSMHW in the analysis region varies interannually. SSMHWs have intensified at a rate of 1.53°C·Days/Year and tend to shift to deeper water over the past three decades. A block-based method for SSMHW identification is proposed, in order to take the vertical extent of the event in consideration. By analyzing the eight most intense events based on spatial cumulative intensity, it suggested that warm mesoscale eddies may play an important role on the spatial distribution of the SSMHWs. Statistical analysis shows that the intensity and coverage of the warm mesoscale eddy in the Xisha zone may influence the intensity and evolution of the SSMHWs. Additionally, only 18.27% of SSMHW events occur with apparent surface marine heatwave signals. These findings are vital for uncovering SSMHW dynamics in the Xisha area, and are important for future monitoring, early warnings and marine conservation.

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“…Furthermore, numerical ocean models have been employed for MHW forecasting in this region [18]. Seasonal variation of MHW has been shown to be important in marginal sea [19,20,21,22]. Meanwhile, seasonal variation of SST is significant in the ECS [20].…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation of Marine Heat Wave in the East China Sea

Li,

He,

Zhao

et al. 2024

J. Phys.: Conf. Ser.

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The satellite-based daily sea surface temperature was used to study the Marine Heat Wave (MHW) in the East China Sea. The seasonal variation of MHW is significant. In winter, the 200 m isobath on the shelf is identified as a section with high-frequency MHW. The duration of MHW is relatively long on the slope and deep basin, and mean intensity of MHW is obviously high in the central Taiwan Strait. In summer, the frequency of MHW is relatively high near the coast of the China Mainland. Meanwhile, the shelf section of the 200 m isobath is also high in frequency. Otherwise, the duration of MHW on the shelf is short. In the northern shelf, the mean intensity of MHW is obviously higher. The total days and maximum intensity of MHW are also discussed, aiming at giving near-fully description of MHW in the East China Sea.

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Classifications and Characteristics of Marine Heatwaves in the Northern South China Sea

Cited by 7 publications

References 39 publications

Cross‐Slope Heat and Salt Transport Induced by Slope Intrusion Eddy's Horizontal Asymmetry in the Northern South China Sea

Cross‐Slope Heat and Salt Transport Induced by Slope Intrusion Eddy's Horizontal Asymmetry in the Northern South China Sea

The spatiotemporal characteristics and driving mechanisms of subsurface marine heatwaves in the Xisha Region

Seasonal variation of Marine Heat Wave in the East China Sea

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