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Statistical characteristics and thermohaline properties of mesoscale eddies in the Bay of Bengal
Acta Oceanologica Sinica ( IF 1.4 ) Pub Date : 2021-06-08 , DOI: 10.1007/s13131-021-1723-4
Wei Cui , Chaojie Zhou , Jie Zhang , Jungang Yang

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.



中文翻译:

孟加拉湾中尺度涡旋的统计特征和温盐特性

从卫星测高数据和Argo剖面研究孟加拉湾中尺度涡旋的统计特征和垂直温盐特性。该领域分析了不同生命周期中的涡流传播偏好、涡流演化过程和涡流动力学特性的地理分布。涡流主要存在于孟加拉湾西部,大部分向西传播。对于寿命长的涡流,尤其是旋风,有明显的向南(赤道)偏好。此外,海湾不同区域的涡流表现出不同的南北偏好。涡动力学性质随寿命的演化表明,涡具有显着的三阶段特征:前五分之一寿命的增长期,中间五分之二至五分之四的稳定期,以及最后五分之一生命的垂死期。大振幅和高强度涡流只发生在高度不稳定的海流相对局限的区域,如东印度海岸海流和斯里兰卡东部。以Argo剖面资料和气候资料为基础,利用涡流合成方法构建了该区涡流的三维温度和盐度结构。300×10 上层气旋/反气旋涡旋平均温度异常为负/正 以Argo剖面资料和气候资料为基础,利用涡流合成方法构建了该区涡流的三维温度和盐度结构。300×10 上层气旋/反气旋涡旋平均温度异常为负/正 以Argo剖面资料和气候资料为基础,利用涡流合成方法构建了该区涡流的三维温度和盐度结构。300×10 上层气旋/反气旋涡旋平均温度异常为负/正4Pa,低于这个深度,异常变弱。孟加拉湾气旋涡内正异常和反气旋涡内负异常的盐度结构与其他地区不一致。由于海湾内水团的特殊性,特别是在表层孟加拉湾低盐度海水和深海印度赤道水的控制下,海水的盐度随着深度呈单调增加趋势。对于温盐结构的区域性变化,随着涡流向西移动,涡流诱发的温度异常增大,涡流影响深度加深,盐度结构受来流影响较大。在南北方向,涡流的盐度结构与当地的水团有关,

更新日期:2021-06-08
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