| Ding Ya'nan,Jing Chunsheng. 2020. Three-dimensional thermohaline anomaly structures of rings in the Kuroshio Extension region. Acta Oceanologica Sinica, 39(3):25－35 |
| Three-dimensional thermohaline anomaly structures of rings in the Kuroshio Extension region |
| 黑潮延伸体区域脱落涡旋的三维合成结构研究 |
| Received:March 23, 2019 |
| DOI：10.1007/s13131-020-1559-3 |
| Key words:Kuroshio Extension pinched-off ring thermohaline anomaly three-dimensional structure composite eddy |
| 中文关键词: 黑潮延伸体 脱落涡旋 温盐异常 三维结构 合成涡旋 |
| 基金项目:The National Key Research and Development Program of China under contract No. 2016YFC1402607; Scientific Research Foundation of Third Institude of Oceanography, Ministry of Nature Resources under contract Nos 2017012 and 2018001; Global Change and Air-Sea Interaction Program under contract Nos GASI-IPOVAI-02 and GASI-IPOVAI-03. |
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| Abstract: |
| Using AVISO satellite altimeter observations during 1993-2015 and a manual eddy detection method, a total of 276 anticyclonic rings and 242 cyclonic rings shed from the Kuroshio Extension (KE) were identified, and their three-dimensional (3D) anomaly structures were further reconstructd based on the Argo float data and the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) cruise and buoy data through an interpolation method. It is found that the cyclonic (anticyclonic) rings presented consistent negative (positive) anomalies of potential temperature; meanwhile the relevant maximum anomaly center became increasingly shallow for the cyclonic rings whereas it went deeper for the anticyclonic rings as the potential temperature anomaly decreased from the west to the east. The above deepening or shoaling trend is associated with the zonal change of the depth of the main thermocline. Moreover, the composite cold ring between 140° and 150°E was found to exhibit a double-core vertical structure due to the existence of mode water with low potential vorticity. Specifically, a relatively large negative (positive) salinity anomaly and a small positive (negative) one appeared for the composite cyclonic (anticyclonic) ring at the depth above and below 600 m, respectively. The underlying driving force for the temperature and salinity anomaly of the composite rings was also attempted, which varies depending on the intensity of the background current and the temperature and salinity fields in different areas of the KE region, and the rings' influences on the temperature and salinity could reach deeper than 1 000 m on average. |
| 中文摘要: |
| 基于1993-2015年AVISO卫星高度计融合数据，采用人工统计的方法识别出黑潮延伸体区域的脱落涡旋，数量分别为276个反气旋涡和242个气旋涡。并结合Argo浮标资料、日本国家海洋与技术研究中心（JAMSTEC）船测资料数据集，利用客观插值法合成了黑潮延伸体区域脱落涡旋的温盐异常三维结构。结果表明，脱落的气旋（反气旋）涡呈现明显的位势温度负（正）异常，自西向东气旋（反气旋）涡引起的位温异常极值深度逐渐变浅（深）、位温异常值减小。140°-150°E脱落的冷涡由于低位势涡度模态水的存在，有“双核”结构特征。脱落的气旋（反气旋）涡在小于600 m深度有相对强的负（正）盐度异常；大于600 m深度气旋（反气旋）涡有相对弱的正（负）盐度异常。黑潮延伸体各区域合成脱落涡旋的温、盐异常的影响程度并不完全相同，可能与各区域背景流强度和温盐场有关，并且脱落涡旋对温盐的平均影响深度可达1 000 m以上。 |
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