| 冬季黑潮延伸体海表温度对阿留申低压活动的双周期响应 |
| |
| 引用本文： | 余沛龙,张立凤,刘虎,刘星,朱娟.冬季黑潮延伸体海表温度对阿留申低压活动的双周期响应[J].海洋学报(英文版),2017,36(9):1-9. |
| |
| 作者姓名： | 余沛龙 张立凤 刘虎 刘星 朱娟 |
| |
| 作者单位： | 解放军理工大学气象海洋学院, 南京, 211101,解放军理工大学气象海洋学院, 南京, 211101,中国人民解放军 61741 部队, 北京, 100025,海洋环境专项办公室, 北京, 100081,海洋环境专项办公室, 北京, 100081 |
| |
| 基金项目： | The National Basic Research Program (973 Program) of China under contract No. 2013CB956203; the National Natural Science Foundation of China under contract No. 41375063; the Junior Fellowships for CAST Advanced Innovation Think-tank Program under contract No. DXB-ZKQN-2016-019. |
| |
| 摘 要： | Based on our previous work, the winter sea surface temperature(SST) in the Kuroshio Extension(KE) region showed significant variability over the past century with periods of ~6 a between 1930 and 1950 and ~10 a between1980 and 2009. How the activity of the Aleutian Low(AL) induces this dual-period variability over the two different timespans is further investigated here. For the ~6 a periodicity during 1930–1950, negative wind stress curl(WSC)anomalies in the central subtropical Pacific associated with an intensified AL generate positive sea surface height(SSH) anomalies. When these wind-induced SSH anomalies propagate westwards to the east of Taiwan, China two years later, positive velocity anomalies appear around the Kuroshio to the east of Taiwan and then the mean advection via this current of velocity anomalies leads to a strengthened KE jet and thus an increase in the KE SST one year later. For the ~10 a periodicity during 1980–2009, a negative North Pacific Oscillation-like dipole takes2–3 a to develop into a significant positive North Pacific Oscillation-like dipole, and this process corresponds to the northward shift of the AL. Negative WSC anomalies associated with this AL activity in the central North Pacific are able to induce the positive SSH anomalies. These oceanic signals then propagate westward into the KE region after 2–3 a, favoring a northward shift of the KE jet, thus leading to the warming of the KE SST. The feedbacks of the KE SST anomaly on the AL forcing are both negative for these two periodicities. These results suggest that the dual-period KE SST variability can be generated by the two-way KE-SST-AL coupling.
|
| 关 键 词： | 海表温度(SST) 黑潮延伸体(KE) 阿留申低压(AL)活动 双周期变率 |
| 收稿时间： | 2016/10/12 0:00:00 |
A dual-period response of the Kuroshio Extension SST to Aleutian Low activity in the winter season |
| |
| YU Peilong,ZHANG Lifeng,LIU Hu,LIU Xing and ZHU Juan.A dual-period response of the Kuroshio Extension SST to Aleutian Low activity in the winter season[J].Acta Oceanologica Sinica,2017,36(9):1-9. |
| |
| Authors: | YU Peilong ZHANG Lifeng LIU Hu LIU Xing and ZHU Juan |
| |
| Institution: | 1.College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China2.No. 61741 Troops of PLA, Beijing 100025, China3.Maritime Environment Project Office, Beijing 100081, China |
| |
| Abstract: | Based on our previous work, the winter sea surface temperature (SST) in the Kuroshio Extension (KE) region showed significant variability over the past century with periods of ~6 a between 1930 and 1950 and ~10 a between 1980 and 2009. How the activity of the Aleutian Low (AL) induces this dual-period variability over the two different timespans is further investigated here. For the ~6 a periodicity during 1930-1950, negative wind stress curl (WSC) anomalies in the central subtropical Pacific associated with an intensified AL generate positive sea surface height (SSH) anomalies. When these wind-induced SSH anomalies propagate westwards to the east of Taiwan, China two years later, positive velocity anomalies appear around the Kuroshio to the east of Taiwan and then the mean advection via this current of velocity anomalies leads to a strengthened KE jet and thus an increase in the KE SST one year later. For the ~10 a periodicity during 1980-2009, a negative North Pacific Oscillation-like dipole takes 2-3 a to develop into a significant positive North Pacific Oscillation-like dipole, and this process corresponds to the northward shift of the AL. Negative WSC anomalies associated with this AL activity in the central North Pacific are able to induce the positive SSH anomalies. These oceanic signals then propagate westward into the KE region after 2-3 a, favoring a northward shift of the KE jet, thus leading to the warming of the KE SST. The feedbacks of the KE SST anomaly on the AL forcing are both negative for these two periodicities. These results suggest that the dual-period KE SST variability can be generated by the two-way KE-SST-AL coupling. |
| |
| Keywords: | sea surface temperature Kuroshio Extension Aleutian Low activity dual-period variability |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
|
