西太平洋暖池热盐结构温度场的时空变化

发布时间：2018-06-27 21:55

本文选题：西太平洋暖池 + 热盐结构　；参考：《海洋通报》2017年01期

【摘要】：基于1950-2011年间热带太平洋月平均温盐度资料,以28°C等温线作为暖池的定义标准,分别计算了暖池区(20°N-15°S,120°E-140°W)各网格点混合层、障碍层和深层的平均温度,从而构成了暖池热盐结构的温度场。据此,运用EOF分析法研究了暖池混合层、障碍层和深层温度距平场的时空变化特征,并探讨了纬向风、纬向流和海面净热通量等要素对这3层温度场主要模态的影响。结果表明,第一模态揭示了暖池中东部3层温度都具有显著的年际变化和长期变化趋势,并在1985年前后经历了一次气候跃变,而第二模态则基本反映了暖池西部3层温度皆存在着明显的年际变化和长期变化趋势,并在1995年前后经历了一次气候跃变。暖池混合层(包括障碍层)温度场前两个模态的年际振荡主要是由纬向风和南赤道流(SEC)共同引起的,而暖池深层温度场前两个模态的年际振荡则是由SEC和赤道潜流(EUC)共同调制的。
[Abstract]:Based on the monthly mean temperature and salinity data of the tropical Pacific during 1950-2011, the mean temperatures of the mixed layer, barrier layer and deep layer of each grid point in warm pool region (20 掳N-15 掳Schion 120 掳E-140 掳W) are calculated using 28 掳C isotherm as the definition standard of warm pool, respectively. Thus, the temperature field of the hot salt structure in the warm pool is formed. Based on this, EOF analysis is used to study the temporal and spatial variation characteristics of temperature anomalies in the mixed layer, barrier layer and deep layer of the warm pool, and the effects of the factors such as zonal wind, zonal current and net heat flux on the main modes of the temperature field in these three layers are discussed. The results show that the first mode reveals that the temperature of the three layers in the central and eastern part of the warm pool has a significant interannual and long-term variation trend, and has experienced a climatic jump around 1985. The second mode basically reflects the obvious interannual and long-term variation of the temperature in the three layers in the western part of the warm pool and a climatic jump around 1995. The annual oscillation of the first two modes of the temperature field in the mixed layer of the warm pool (including the barrier layer) is mainly caused by the zonal wind and the Southern Equator current (SEC). The interannual oscillation of the first two modes of the deep temperature field in the warm pool is modulated by the SEC and the equatorial submersible current (EUC).
【作者单位】：国家海洋环境预报中心国家海洋局海洋灾害预报技术研究重点实验室;中国科学院海洋研究所中国科学院海洋环流与波动重点实验室;青岛海洋科学与技术国家实验室海洋动力过程与气候功能实验室;
【基金】：国家重点基础研究发展计划(2012CB417402)
【分类号】：P731

【参考文献】