【摘要】 利用1950—2000年马里兰大学全球海洋同化分析资料分析了太平洋海温年代际变化的垂直结构和传播特征,结果表明,太平洋上层海温存在显著的年代际变化,其最强区为北太平洋中部偏西地区100 m层次,热带东太平洋50 m层次,热带西太平洋150 m层次,热带西南太平洋190 m层次,日本东南沿海443.5 m以上层次;年代际变化的垂直结构与温度层结有关,年代际变化的显著层都对应于温度随深度变化的极大值处;源自北太平洋中部海表的信号向深层延伸,并由窗口地区向西南潜沉,热带西南太平洋的信号越过赤道向东北挺进,在传播过程中,两处信号的走向都是沿着温度随深度变化的极大值即20℃等温线处,并于副热带20℃等温线转折处汇合;北太平洋40°N附近的年代际变化起源于海表,并向深层传播,而低纬度的信号多起源于150~250 m处的系统加深,故其海表和深层的位相往往不一致。更多还原

【Abstract】 Vertical structure and propagation character of the interdecadal variation of Pacific sea temperatures are investigated using Maryland Ocean Data Assimilation analysis datasets.The results show that there are significant interdecadal variations of sea temperatures in the upper level of Pacific ocean.The five key regions are the 100m level of western central North Pacific,the 50m level of eastern tropic Pacific,the 150m level of western tropic Pacific,the 190m level of southwest tropic Pacific and the upper 443.5m off the SE coast of Japan,respectively.The vertical structure of Pacific interdecadal variability is related with the stratification of temperature.The level with remarkable variability is located in the level with the maximum variance.The interdecadal signal from Pacific windows region propagate western southward along subduction route,and one from the southwest tropical Pacific crosses the equator and pushs forward along the 20℃ isopleth to the northeast,both merge at the turning point of subtropic 20℃ isopleth.The interdecadal signal of the north Pacific at 40°N usually originated from the surface ocean propagates to deeper levels,but the interdecadal signal of the tropical Pacific is most originated from the strengthening of systems between 150m and 250m,so that the phases of signal between surface and lower levels are always not the same.更多还原