首页 | 本学科首页   官方微博 | 高级检索  
     检索      

南太平洋南极中层水的中尺度特征
引用本文:冯颖,陈显尧,王勤,袁业立.南太平洋南极中层水的中尺度特征[J].海洋学报(英文版),2015,34(11):92-101.
作者姓名:冯颖  陈显尧  王勤  袁业立
作者单位:海洋与地球学院, 厦门大学, 厦门, 361005, 中国,海洋环境学院, 中国海洋大学, 青岛, 266100, 中国,浙江省海洋监测和预测中心, 杭州, 310007, 中国,海洋环境和数值模拟实验室, 国家海洋局第一海洋研究所, 266061, 中国
基金项目:The National Natural Science Foundation of China under contract No. 41176029; the Basic Scientific Fund for National Public Research Institute of China under contract No. GY02-2012G25.
摘    要:The Argo float observations are used to investigate the mesoscale characteristics of the Antarctic Intermediate Water(AAIW) in the South Pacific in this paper. It is shown that a subsurface mesoscale phenomenon is probably touched by an Argo float during the float's ascent-descent cycles and is identified by the horizontal salinity gradient between the vertical temperature-salinity profiles. This shows that the transportation of the AAIW may be accompanied with the rich mesoscale characteristics. To derive the spatial length, time, and propagation characteristics of the mesoscale variability of the AAIW, the gridded temperature-salinity dataset ENACT/ENSEMBLE Version 3 constructed on the in-situ observations in the South Pacific since 2005 is used. The Empirical Mode Decomposition method is applied to decompose the isopycnal-averaged salinity anomaly from26.8 σθ–27.4 σθ, where the AAIW mainly resides, into the basin scale and two mesoscale modes. It is found that the first mesoscale mode with the length scale on the order of 1 000 km explains nearly 50% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speeds are slower in the mid-latitude(around 1cm/s) and faster in the low latitude(around 6 cm/s), but with an increasing in the latitude band on 25°–30°S. The second mesoscale mode is of the length scale on the order of 500 km, explaining about 30% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speed keeps nearly unchanged(around 0.5cm/s). These results presented the stronger turbulent motion of the subsurface ocean on the spatial scale, and also described the significant role of Argo program for the better understanding of the deep ocean.

关 键 词:中尺度特征  次表层海洋  南极中层水  ARGO漂流浮标
收稿时间:2015/3/19 0:00:00
修稿时间:6/2/2015 12:00:00 AM

Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific
FENG Ying,CHEN Xianyao,WANG Qin and YUAN Yeli.Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific[J].Acta Oceanologica Sinica,2015,34(11):92-101.
Authors:FENG Ying  CHEN Xianyao  WANG Qin and YUAN Yeli
Institution:1.College of Ocean and Earth Sciences, Xiamen University, Xiamen 361002, China2.Key Laboratory of Physcial Oceanography, Ocean University of China, Qingdao 266100, China3.Marine Monitoring and Forecasting Center of Zhejiang, Hangzhou 310007, China4.Key Laboratory of Marine Science and Numerical Modeling, the First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Abstract:The Argo float observations are used to investigate the mesoscale characteristics of the Antarctic Intermediate Water (AAIW) in the South Pacific in this paper. It is shown that a subsurface mesoscale phenomenon is probably touched by an Argo float during the float's ascent-descent cycles and is identified by the horizontal salinity gradient between the vertical temperature-salinity profiles. This shows that the transportation of the AAIW may be accompanied with the rich mesoscale characteristics. To derive the spatial length, time, and propagation characteristics of the mesoscale variability of the AAIW, the gridded temperature-salinity dataset ENACT/ENSEMBLE Version 3 constructed on the in-situ observations in the South Pacific since 2005 is used. The Empirical Mode Decomposition method is applied to decompose the isopycnal-averaged salinity anomaly from 26.8 σθ-27.4 σθ, where the AAIW mainly resides, into the basin scale and two mesoscale modes. It is found that the first mesoscale mode with the length scale on the order of 1 000 km explains nearly 50% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speeds are slower in the mid-latitude (around 1 cm/s) and faster in the low latitude (around 6 cm/s), but with an increasing in the latitude band on 25°-30°S. The second mesoscale mode is of the length scale on the order of 500 km, explaining about 30% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speed keeps nearly unchanged (around 0.5 cm/s). These results presented the stronger turbulent motion of the subsurface ocean on the spatial scale, and also described the significant role of Argo program for the better understanding of the deep ocean.
Keywords:mesoscale characteristics  subsurface ocean  Antarctic Intermediate Water (AAIW)  Argo
本文献已被 CNKI 万方数据 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
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号