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Observed deep energetic eddies by seamount wake.

Chen G, Wang D, Dong C, Zu T, Xue H, Shu Y, Chu X, Qi Y, Chen H - Sci Rep (2015)

Bottom Line: It remarkably deepens isotherm at deep layers by the amplitude of ~120 m and induces a maximal velocity amplitude about 0.18 m/s, which is far larger than the median velocity (0.02 m/s).The deep eddy is generated in a wake when a steering flow in the upper layer passes a seamount, induced by a surface cyclonic eddy.Deep eddies significantly increase the velocity intensity and enhance the mixing in the deep ocean, also have potential implication for deep-sea sediments transport.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China.

ABSTRACT
Despite numerous surface eddies are observed in the ocean, deep eddies (a type of eddies which have no footprints at the sea surface) are much less reported in the literature due to the scarcity of their observation. In this letter, from recently collected current and temperature data by mooring arrays, a deep energetic and baroclinic eddy is detected in the northwestern South China Sea (SCS) with its intensity, size, polarity and structure being characterized. It remarkably deepens isotherm at deep layers by the amplitude of ~120 m and induces a maximal velocity amplitude about 0.18 m/s, which is far larger than the median velocity (0.02 m/s). The deep eddy is generated in a wake when a steering flow in the upper layer passes a seamount, induced by a surface cyclonic eddy. More observations suggest that the deep eddy should not be an episode in the area. Deep eddies significantly increase the velocity intensity and enhance the mixing in the deep ocean, also have potential implication for deep-sea sediments transport.

No MeSH data available.


Related in: MedlinePlus

Evolution of the simulated deep eddy.Evolution of the simulated deep eddy shown in Fig. 4 at 600 m and 900 m. Color shows the bathymetry, and white means the land. Maps are generated using MATLAB.
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f5: Evolution of the simulated deep eddy.Evolution of the simulated deep eddy shown in Fig. 4 at 600 m and 900 m. Color shows the bathymetry, and white means the land. Maps are generated using MATLAB.

Mentions: The model outputs are used to further understand the deep eddy evolution. Because the northward branch flow of the surface eddy passes the seamount on its left side (Day 0 in Fig. 5), the anticyclonic deep eddy rather than a cyclonic eddy is generated to the north of the seamount. The deep eddy becomes stronger and extends northwestward (Days 6 and 12), and then propagates westward due to β effect when the surface eddy leaves and surface current becomes weak (Days 12, 18 and 24). Due to the restriction of topography, the deep eddy finally prorogates southwestward along the isobaths (Days 24 and 30).


Observed deep energetic eddies by seamount wake.

Chen G, Wang D, Dong C, Zu T, Xue H, Shu Y, Chu X, Qi Y, Chen H - Sci Rep (2015)

Evolution of the simulated deep eddy.Evolution of the simulated deep eddy shown in Fig. 4 at 600 m and 900 m. Color shows the bathymetry, and white means the land. Maps are generated using MATLAB.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663540&req=5

f5: Evolution of the simulated deep eddy.Evolution of the simulated deep eddy shown in Fig. 4 at 600 m and 900 m. Color shows the bathymetry, and white means the land. Maps are generated using MATLAB.
Mentions: The model outputs are used to further understand the deep eddy evolution. Because the northward branch flow of the surface eddy passes the seamount on its left side (Day 0 in Fig. 5), the anticyclonic deep eddy rather than a cyclonic eddy is generated to the north of the seamount. The deep eddy becomes stronger and extends northwestward (Days 6 and 12), and then propagates westward due to β effect when the surface eddy leaves and surface current becomes weak (Days 12, 18 and 24). Due to the restriction of topography, the deep eddy finally prorogates southwestward along the isobaths (Days 24 and 30).

Bottom Line: It remarkably deepens isotherm at deep layers by the amplitude of ~120 m and induces a maximal velocity amplitude about 0.18 m/s, which is far larger than the median velocity (0.02 m/s).The deep eddy is generated in a wake when a steering flow in the upper layer passes a seamount, induced by a surface cyclonic eddy.Deep eddies significantly increase the velocity intensity and enhance the mixing in the deep ocean, also have potential implication for deep-sea sediments transport.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China.

ABSTRACT
Despite numerous surface eddies are observed in the ocean, deep eddies (a type of eddies which have no footprints at the sea surface) are much less reported in the literature due to the scarcity of their observation. In this letter, from recently collected current and temperature data by mooring arrays, a deep energetic and baroclinic eddy is detected in the northwestern South China Sea (SCS) with its intensity, size, polarity and structure being characterized. It remarkably deepens isotherm at deep layers by the amplitude of ~120 m and induces a maximal velocity amplitude about 0.18 m/s, which is far larger than the median velocity (0.02 m/s). The deep eddy is generated in a wake when a steering flow in the upper layer passes a seamount, induced by a surface cyclonic eddy. More observations suggest that the deep eddy should not be an episode in the area. Deep eddies significantly increase the velocity intensity and enhance the mixing in the deep ocean, also have potential implication for deep-sea sediments transport.

No MeSH data available.


Related in: MedlinePlus