利用Argo浮标定位信息估算分析赤道太平洋中层流场状况

Evaluation and analysis of Mid-Depth currents of the equatorial pacific using ARGO float position information

本文利用Argo浮标的定位信息,经过较为严格的质量控制与误差估算,得到2003～2005年赤道太平洋区域中层流场信息,并对其进行较为详细的诊断与分析,得到以下几个结论:(1)棉兰老涡、赤道逆流和南赤道流在中层流场中多数时间清晰可辨,北赤道流较弱,有时不易分辨。(2)棉兰老涡、赤道逆流和南赤道流都存在明显的季节变化。一般在2、3月间最弱,8、9月间最强。(3)棉兰老涡、赤道逆流和南赤道流存在较明显的年际变化。(4)赤道逆流通常表现为两支,分别位于东赤道太平洋和西赤道太平洋,东太平洋支主轴位置大约在7～8°N附近,西太平洋支主轴位置大约在3°N附近。

The paper evaluated and analyzed the mid-depth currents of equatorial Pacific using the Array for Real-time Geostrophic Oceanography （ARGO） float position information, which has been carried out a rigorous quality control scheme and error evaluation. We evaluated and analyzed the mid-depth currents form 2003 to 2005 to draw the following conclusions： （1）Mindalao eddy, Noah Equatorial Counter Current （NECC）and South Equatorial Current （SEC） in mid-depth currents can be identified clearly in most time, but North Equatorial Current （NEC） was week, sometime can not be identified. （2） Mindalao eddy, NECC and SEC were provided with obvious seasonal variation. Commonly, they were the weakest in February and March and the strongest in August and September in a year. （3） Mindalao eddy, NECC and SEC were provided with obvious annual variation. （4） NECC can be divided into two embranchments. One located in the eastern of equatorial Pacific, which principal axis was lied at about 7 - 8°N, another located in the western of equatorial Pacific, which principal axis was lied at about 3°N.