Observational energy transfers of a spiral cold filament within an anticyclonic eddy

Qiu, Chunhua; Yang, Zihao; Feng, Ming; Yang, Jun; Rippeth, Tom P.; Shang, Xiaodong; Sun, Zhenyu; Jing, Chunsheng; Wang, Dongxiao

doi:10.1016/j.pocean.2023.103187

Cited by 5 publications

(1 citation statement)

References 71 publications

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“…In addition to transporting cold water from the seabed to the sea surface to reduce the sea surface temperature (SST), the upwelling also transports nutrients from the seabed to the sea surface, causing phytoplankton blooms under photosynthesis (Hu et al, 2021;Shaw et al, 1996;Wang et al, 2010). The ocean currents transport cold water through cold advection, which not only causes cold water phenomena but can also transport phytoplankton over a long distance (Li et al, 2017;Qiu et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

Cold Water Phenomenon in Autumn in the Sea Area of the Xisha Islands

Sun,

Li,

Zhai

et al. 2024

JGR Oceans

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Using satellite observation and reanalysis data, we studied the cold water phenomenon in the sea area of the Xisha Islands in autumn from 2003 to 2022. The cold water phenomenon refers to a colder water body relative to its surrounding area, which can partially offset the impact of global warming, thereby contributing to the protection and restoration of marine ecosystems. The cold water with a central position close to the Xisha Islands is distributed in a nearly circular area, and exhibits seasonal and interannual variations. It usually occurs at the end of September, with its intensity rapidly increasing and reaching its peak on October 1, then gradually weakening, and finally disappearing by November 6. The maximum intensity of the cold water phenomenon can reach 1.6°C. This phenomenon notably observed in October 2006, 2009, 2013 and 2022, with intensities reaching 0.9°C, 1.1°C, 1.1°C, and 0.4°C, respectively. The dynamic mechanism of its formation can be described as follows: in autumn of some years, the northeast monsoon occurs in the northern part of the South China Sea (SCS), while the southwest monsoon still prevails in the southern part of the SCS, which causes the generation of strong positive wind stress curl (WSC) near the Xisha sea area. The positive WSC causes cyclonic circulation and further causes upwelling through Ekman pumping, which transports low‐temperature water from the seabed to the sea surface and thus leads to the occurrence of the cold water phenomenon in the Xisha sea area.

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Section: Introductionmentioning

confidence: 99%

Cold Water Phenomenon in Autumn in the Sea Area of the Xisha Islands

Sun,

Li,

Zhai

et al. 2024

JGR Oceans

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Submesoscale processes and their seasonality generated by freshwater discharge at the Yangtze estuary

Wang,

Dong,

Xuan

et al. 2024

Estuarine, Coastal and Shelf Science

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Effects of Symmetric Instability on Potential Vorticity Budget in the Kuroshio Extension Region via a Parameterization Scheme

Ma,

Dong,

Dong

et al. 2024

JGR Oceans

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As one kind of submesoscale instabilities, symmetric instability (SI) with spatiotemporal scales of O (100) m–O (1) km and O (1) hour exerts significant effects on vertical material transports and forward energy cascade in the ocean. The potential vorticity (PV) is an important conservative parameter controlling quasi‐geostrophic flows, whose budget can be modulated by SI. However, due to the small spatial scale of SI which is hardly resolved by most current observations and regional models, how SI affects the PV budget and how big the effect is remain unclear. In this work, the effect of SI on the PV budget in the surface mixed layer (SML) of the Kuroshio Extension region is quantitatively analyzed based on high‐resolution simulations by applying an existing SI parameterization scheme. Compared with the case without SI effects, negative PV is found to be eliminated in the SML in the SI‐parameterized case. The negative‐PV likelihood in the SI‐parameterized case is decreased by up to 12% due to SI. Analysis of the PV budget indicates that SI contributes to the PV budget mainly by modulating the friction term. The friction term tends to generate negative PV but its magnitude is decreased by 35% due to SI. Apart from the frictional term, both advection and non‐adiabatic terms are also found to be modulated by SI. This work sheds light on the contribution of SI in the PV budget in the ocean mixed layer and suggests a significant role of SI in quasi‐geostrophic PV dynamics.

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Observational energy transfers of a spiral cold filament within an anticyclonic eddy

Cited by 5 publications

References 71 publications

Cold Water Phenomenon in Autumn in the Sea Area of the Xisha Islands

Cold Water Phenomenon in Autumn in the Sea Area of the Xisha Islands

Submesoscale processes and their seasonality generated by freshwater discharge at the Yangtze estuary

Effects of Symmetric Instability on Potential Vorticity Budget in the Kuroshio Extension Region via a Parameterization Scheme

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