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基于2004年1月至2010年12月期间的网格化Argo剖面资料,分析了西太平洋暖池的三维结构以及暖池体积的变化特征,并探讨了进出暖池的经、纬向流量变化及暖池暖水可能的维持机制.结果表明,西太平洋暖池最深可达120 m,且由表层向下,面积逐渐缩小并向南倾斜(到100 m,主体几乎全部位于赤道以南).依水团结构计算,暖池体积约为1.86×1015m3.暖池体积的年变化呈明显的双峰结构,最大值分别出现在6月和10月;暖池体积的年际变化与ENSO事件相联系,其在ENSO年具有非常明显的体积变异.从多年平均的角度分析,纬向上进入暖池的暖水流量约52 Sv,主要集中在暖池上层,且以东边界流入为主,而流出暖水约49 Sv,主要集中在暖池中下层,且以西边界损耗为主.经向上流进暖池的暖水约28 Sv,主要以南、北边界的上层为主,而从南、北边界流出暖池的暖水(总量约23 Sv)在数值和各层次上不相上下.暖水进出暖池的季节和年际变化特征显示,暖池在纬向上以暖水损耗为主,而经向上则以获取暖水为主.暖池体积与进出暖池的暖水净流量在季节时间尺度上存在较强的相关性,不过二者在年际尺度上相关系数较低.然而,在年际时间尺度上,暖池在经向上的暖平流受到ENSO事件的影响要强于纬向,在2007年和2010年两次强La Nia事件中,经向各边界进出暖池的暖水净流量异于正常年份,从而影响暖池暖水的供应,使得暖池体积在ENSO事件中发生变异.虽然绝对地转流在赤道上是不成立的,而暖池的上层又是跨赤道的,但我们的分析结果仍然可以帮助人们对于西太平洋暖池暖水的流入和流出情况获得一定的认知.
Based on the data of gridded Argo from January 2004 to December 2010, the three-dimensional structure of the western Pacific warm pool and the characteristics of the volume of the warm pool were analyzed. The changes of the flow in the warm pool and the latitude of the warm pool were also discussed. The results show that the deepest reaches of the western Pacific warm pool can reach up to 120 m, and the surface area of the pool is gradually reduced and tilted to the south (to 100 m, with almost all of the main body located south of the equator). Water volume structure calculation, the volume of the warm pool is about 1.86 × 1015m3. The annual variation of the volume of the warm pool shows a clear double peak structure, the maximum appears in June and October respectively. The interannual variation of the volume of the warm pool is related to the ENSO event , Which has very obvious volume variation in ENSO years.According to the analysis of multi-year average, the warm water flux entering the warm pool in the latitudinal direction is about 52 Sv, mainly concentrated in the upper part of the warm pool and mainly flowing in the east boundary, The water is about 49 Sv, mainly concentrated in the middle and lower parts of the warm pool, with the westerly boundary loss as the dominant part. The warm water flowing into the warm pool upwards is about 28 Sv, dominated by the upper layers of the south and north borders, The warm water flowing out of the warm pool (a total of about 23 Sv) is not comparable in magnitude and in all levels The seasonal and interannual variations of warm water entering and exiting the warm pool show that the warm pool is dominated by warm water loss in the latitudinal direction and the warm water is mainly taken in the upward direction.The volume of the warm pool and the warm water entering and exiting the warm pool However, on the interannual time scale, the warm advection warp in the meridional direction is more affected by the ENSO event than in the warm season In the latitudinal direction, during the two strong La Nia events in 2007 and 2010, the net flow of warm water entering and exiting the warm pool at each boundary is different from normal years, thus affecting the supply of warm pool warm water, making the warm pool volume at Although variations in ENSO events are not true at the equator, and the upper reaches of the warm pools are also trans-equatorial, our results can still help to explain the inflow and outflow of warm water in the western Pacific warm pool Get some understanding.