The different relationship of Pacific interior subtropical cells and two types of ENSO
The different relationship of Pacific interior subtropical cells and two types of ENSO
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DOI：
10.1007/s10872-018-0478-9
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发表时间：
2018-05
影响因子：
2.3
通讯作者：
Junqiao Feng;D. Hu;F. Jin;Fan Jia;Qingye Wang;S. Guan
中科院分区：
文献类型：
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作者：
Junqiao Feng;D. Hu;F. Jin;Fan Jia;Qingye Wang;S. Guan
利用1980-2017年GODAS再分析海洋资料，研究了太平洋内部副热带-热带环流（STC）及其与两类厄尔尼诺-南方涛动（ENSO）的关系。结果表明，经9°S和9°N进入赤道区的STC内部输送与东太平洋ENSO有密切的关系，而与中太平洋ENSO的关系较弱。这表明，热带太平洋气候的影响是反映在它与西太平洋温跃层深度或SSHA的关系。在EP厄尔尼诺期间，9°S和9°N的异常内部STC在-25到-8的滞后月内向赤道地区会聚，导致赤道太平洋热含量的积累;在-8到10的滞后月内，它们向极地发散，导致赤道热含量的释放。极向内部STC距平峰值出现在9°N，出现时间为零滞后，而9°S的STC距平峰值出现在4-5个月后。但在EP拉尼娜成熟阶段，9°N和9°S的STCs在补给期间也没有出现时滞。而在CP El Niño期间，仅在成熟期和衰减期的-2 ~10个滞后月内出现明显的异常内部STC辐散，并在9°N和9°S对称。
The Pacific interior subtropical−tropical cells (STCs) and their relation to the two types of El Niño-Southern Oscillation (ENSO) are investigated by using GODAS reanalysis ocean data for the period of 1980–2017. The results show that the interior STC transport into the equatorial region across 9°S and 9°N has a close relationship with the eastern Pacific (EP) ENSO, while it is much weaker with the central Pacific (CP) ENSO. It is suggested that the effect of interior STCs on the tropical Pacific climate is reflected in its relation with the western Pacific thermocline depth or SSHA. During the EP El Niño, the anomalous interior STCs at 9°S and 9°N converge to the equatorial region from the lag months of − 25 to − 8, leading to an accumulation of heat content in the equatorial Pacific; from the lag months of − 8 to 10, they diverge poleward, inducing a discharge of equatorial heat content. The peak poleward interior STC anomaly first appears at 9°N at a zero-lag time, while that at 9°S is observed 4–5 months later. But there is also no appearance of a time lag between the interior STCs at 9°N and 9°S in recharging the period during the EP La Niña mature phase. However, during CP El Niño, only the conspicuous anomalous interior STC divergence appears during the mature and decay phases for the lag months of − 2 to 10, with being symmetric at 9°N and 9°S.