Statistical characteristics and thermohaline properties of mesoscale eddies in the Bay of Bengal

Wei Cui; Chaojie Zhou; Jie Zhang; Jungang Yang

doi:10.1007/s13131-021-1723-4

Volume 40 Issue 4

Jun. 2021

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Wei Cui, Chaojie Zhou, Jie Zhang, Jungang Yang. Statistical characteristics and thermohaline properties of mesoscale eddies in the Bay of Bengal[J]. Acta Oceanologica Sinica, 2021, 40(4): 10-22. doi: 10.1007/s13131-021-1723-4

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Wei Cui, Chaojie Zhou, Jie Zhang, Jungang Yang. Statistical characteristics and thermohaline properties of mesoscale eddies in the Bay of Bengal[J]. Acta Oceanologica Sinica, 2021, 40(4): 10-22. doi: 10.1007/s13131-021-1723-4

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Statistical characteristics and thermohaline properties of mesoscale eddies in the Bay of Bengal

doi: 10.1007/s13131-021-1723-4

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Hainan Insititute of Zhejiang University, Sanya 572000, China

Funds: The National Key Research and Development Program of China under contract No. 2016YFC1401800; the Basic Scientific Fund for National Public Research Institutes of China under contract No. 2020Q07; the National Natural Science Foundation of China under contract No. 41576176; the Dragon 4 Project under contract No. 32292; the National Programme on Global Change and Air-Sea Interaction under contract Nos GASI-02-PAC-YGST2-04, GASI-02-IND-YGST2-04 and GASI-02-SCS-YGST2-04.

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Corresponding author: E-mail: hitzcj@163.com
Received Date: 2020-05-08
Accepted Date: 2020-06-22

Available Online: 2021-05-06

Publish Date: 2021-06-03

Abstract

Abstract

The statistical characteristics and vertical thermohaline properties of mesoscale eddies in the Bay of Bengal are studied from the view of satellite altimetry data and Argo profiles. Eddy propagation preferences in different lifetimes, eddy evolution process, and geographical distribution of eddy kinetic properties are analyzed in this area. Eddies exist principally in the western Bay of Bengal, and most of them propagate westward. There is a clear southward (equatorward) preference for eddies with long lifetimes, especially for cyclones. Moreover, the eddies in different areas of the bay show different north-southward preferences. Evolution of eddy kinetic properties with lifetime shows that eddies have the significant three-stage feature: the growth period in the former one-fifth lifetime, the stable period in the middle two-fifth to four-fifth lifetime, and the dying period in the last one-fifth lifetime. Large-amplitude and high-intensity eddies occur only in the relatively confined regions of highly unstable currents, such as the East Indian Coastal Current and eastern Sri Lanka. Based on Argo profile data and climatology data, the eddy synthesis method was used to construct three-dimensional temperature and salt structures of eddies in this area. The mean temperature anomaly is negative/positive to the cyclonic/anticyclonic eddies in the upper 300×10⁴ Pa, and below this depth, the anomaly becomes weak. The salinity structures of positive anomalies inside cyclonic eddies and negative anomalies inside anticyclonic eddies in the Bay of Bengal are not consistent with other regions. Due to the special characteristics of the water mass in the bay, especially under the control of the low-salinity Bay of Bengal water at the surface and the Indian equatorial water in the deep ocean, the salinity of seawater shows a monotonic increase with depth. For regional varieties of temperature and salinity structures, as the eddies move westward, the temperature anomaly induced by the eddies increases, the effecting depth of the eddies deepens, and the salinity structures are more affected by inflows. In the north-south direction, the salinity structures of the eddies are associated with the local water masses, which comprise low-salinity water in the northern bay due to the inflow of freshwater from rivers and salty water in the southern bay due to the invasion of Arabian Sea high-salinity water from the north Indian Ocean.
- mesoscale eddy,
- Bay of Bengal,
- thermohaline structures,
- satellite altimetry,
- Argo data

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References(50)

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