摘要
6条澳大利亚塔斯马尼亚至南极罗斯海抛弃式温盐深观测断面及卫星海表温度数据被用来分析西南太平洋海洋锋面的分布特征。分析表明季节变化对锋面位置并无显著影响,但锋面垂向结构则会有所差异。亚南极锋(Subantarctic Front,SAF)和极锋(Polar Front,PF)在西南太平洋海域存在较普遍的双分支特征,在SAF双分支中,S-SAF温度梯度一般大于2.0℃·(100 km)^-1,N-SAF温度梯度一般大于1.0℃·(100 km)^-1。本文判断的西南太平洋锋面位置与Orsi等[1]在1995年总结的位置分布基本一致,但各锋面位置均略向北偏移。受东南印度洋中脊海底地形的影响,SAF和PF在经过塔斯马尼亚以南海域后明显向东南偏移,并在170°E^175°E海域到达最南处。根据卫星海表温度梯度判定的PF位置比次表层中2℃海水等温线的北边界更靠近极地,在145°E断面,这种间距超过5个纬度,而在175°E断面,这种间距约1个纬度。因亚热带锋(Subtropical Front,STF)、SAF和PF对海表温度有一定的影响,利用卫星海表温度梯度判断的锋面位置具有较高的可信度。
Six expendable conductivity–temperature–depth sections from Tasmania,Australia to the Ross Sea,Antarctica,and satellite sea surface temperature(SST)data were used to study the distribution of fronts of the Southwest Pacific Ocean.The analysis showed that seasonal variation had no significant influence on the front locations,but that the frontal vertical structure differed.The Subantarctic Front(SAF)and Polar Front(PF)generally had double branches in the Southwest Pacific.For the double branches of the SAF,the temperature gradient of the South-SAF was generally greater than 2.0℃·(100km)^-1,whereas the gradient of the North-SAF was generally greater than 1.0℃·(100km)^-1.The front locations identified based on in-field data in this paper were basically consistent with the frontal pattern summarized by Orsi et al.in 1995,but the locations were shifted slightly northward.Because of the topographic influence of the Southeast Indian Ridge,the SAF and PF were obviously shifted to the southeast after passing south of Tasmania,Australia,and reached their southernmost points between 170°E and 175°E.The PF location identified based on the SST gradient was farther south relative to the northern boundary of the 2℃ isotherm in the subsurface layer;in the 145°E section,the spacing was more than 5 degrees of latitude,whereas in the 155°E section,the spacing was about 1 degree of latitude.Because the Subtropical Front(STF),SAF,and PF had certain influences on the surface temperature,the corresponding frontal locations identified based on the satellite SST gradient were reliable.
作者
杨威
李丙瑞
高立宝
李锐祥
刘长建
马磊
Yang Wei;Li Bingrui;Gao Libao;Li Ruixiang;Liu Changjian;Ma Lei(South China Sea Marine Survey and Technology Center,State Oceanic Administration,Guangzhou 510300,China;Key Laboratory of Marine Environment Survey Technology and Application,Ministry of Natural Resources,Guangzhou 510300,China;Key Laboratory for Polar Science,Ministry of Natural Resources,Polar Research Institute of China,Shanghai 200136,China;First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China)
出处
《极地研究》
CAS
CSCD
北大核心
2020年第4期469-482,共14页
Chinese Journal of Polar Research
基金
自然资源部极地科学重点实验室开放研究基金项目(KP201701)
束星北青年学者基金项目(2018S02)
工信部高技术船舶项目(MC-201919-C11)
国家自然科学基金项目(41876231)
南极重点海域对气候变化的响应与反馈(RFSOCC2020-2025)
国家重点研发计划项目(2018YFA0605701)资助。
关键词
西南太平洋
海洋锋面
XCTD
卫星海表温度
Southwest Pacific
ocean fronts
expendable conductivity-temperature-depth
satellite sea surface temperature
