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An irregularly shaped warm eddy observed by Chinese underwater gliders
Qiu Chunhua4; Mao Huabin1; Wang Yanhui2; Yu Jiancheng3; Su Danyi; Lian Shumin1
AbstractMesoscale eddies are important for transporting oceanic energy and matter. We investigated the three-dimensional structure of an irregularly shaped warm eddy using three Chinese underwater gliders and satellite data during May 2015 in the northern South China Sea. The warm eddy lasted for 2 months, remained quasi-steady, and had a mean radius of similar to 70 km from May 10 to May 31. The heat contents observed along the two glider tracks differed markedly, by 2 x 10(9) J/m(2), which reflected an imbalance in the geostrophic and tangential velocity distributions of the eddy. The geostrophic/tangential velocity decreased/increased with depth within the warm eddy. The maximum tangential velocities calculated using the datasets from the two gliders were 0.8 and 0.25 m/s, respectively, confirming that the shape of the warm eddy was horizontally asymmetrical. Large errors can arise when the heat, energy, and matter transport for an irregularly shaped eddy are estimated using a regular circular model. We suggest that more intersecting glider tracks should be used to retrieve the three-dimensional eddy structure, and that those tracks should be better designed. The irregular shape of the warm eddy was likely induced by oceanic currents such as the wind-induced Ekman current. Further study is needed to elucidate the eddy-current interactions and the mechanisms thereof.
KeywordIrregular shape Warm eddy Chinese underwater glider Oceanic current Eddy-current interaction
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Document Type期刊论文
Affiliation1.Sun Yat Sen Univ, Sch Marine Sci, Ctr Coastal Ocean Sci & Technol, Guangzhou 510275, Guangdong, Peoples R China
2.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
3.Tianjin Univ, Sch Mech Engn, Tianjin 300072, Peoples R China
4.Chinese Acad Sci, Shenyang Inst Automat, State Key Lab Robot, Shenyang 110016, Liaoning, Peoples R China
5.Sun Yat Sen Univ, Sch Marine Sci, Guangdong Prov Key Lab Marine Resources & Coastal, Guangzhou 510275, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Qiu Chunhua,Mao Huabin,Wang Yanhui,et al. An irregularly shaped warm eddy observed by Chinese underwater gliders[J]. JOURNAL OF OCEANOGRAPHY,2019,75(2):139, 148.
APA Qiu Chunhua,Mao Huabin,Wang Yanhui,Yu Jiancheng,Su Danyi,&Lian Shumin.(2019).An irregularly shaped warm eddy observed by Chinese underwater gliders.JOURNAL OF OCEANOGRAPHY,75(2),139.
MLA Qiu Chunhua,et al."An irregularly shaped warm eddy observed by Chinese underwater gliders".JOURNAL OF OCEANOGRAPHY 75.2(2019):139.
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