Interannual fluctuations of the Mindanao Current inferred from sea level
Interannual fluctuations of the Mindanao Current inferred from sea level
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DOI：
10.1029/jc093ic06p06744
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发表时间：
1988-06
影响因子：
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通讯作者：
R. Lukas
中科院分区：
文献类型：
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作者：
R. Lukas
最近对厄尔尼诺-南方涛动（ENSO）的一些假设意味着棉兰老洋流的波动可能参与了这一现象的早期阶段。本文首先回顾了对这种向南流动的西边界流的相对贫乏的认识，然后将菲律宾棉兰老岛和帕劳的马拉卡勒岛之间的海平面差异用作棉兰老海流波动的指标。差分序列涵盖1974年至1985年期间，包括1976年和1982-1983年的厄尔尼诺/南方涛动事件。此外，有些反常的（但非厄尔尼诺/南方涛动）1980年也包括在记录中。海平面差异的主要信号是一年两次的振荡。估计输运变化至少为16 Sv，约为平均输运的50%。在两次ENSO事件发生前的一年，棉兰老海流相对较弱，而在ENSO事件发生的一年，海流则强于平均水平。然而，最强的波动发生在1979-1980年的非ENSO期间，棉兰老海流的波动与ENSO信号的强度之间没有明显的关系。
Some recent hypotheses for the El Nino-Southern Oscillation (ENSO) imply that fluctuations of the Mindanao Current may be involved in the early stages of the phenomenon. In this paper, first the relatively sparse knowledge of this southward flowing western boundary current is reviewed, and then the difference in sea level between the islands of Mindanao in the Philippines and Malakal in Palau is used as an index of Mindanao Current fluctuations. The difference series spans the period 1974 through 1985, encompassing the 1976 and 1982–1983 ENSO events. In addition, the somewhat anomalous (but non-ENSO) 1980 year is included in the record. The dominant signal in the sea level difference is a biannual oscillation. Estimated transport changes are at least 16 Sv, or about 50% of the mean transport. In the year prior to the two ENSO events, the Mindanao Current is relatively weak, while during the ENSO year the current is stronger than average. However, the strongest fluctuations occur in the non-ENSO period 1979–1980, and there is no apparent relationship between the fluctuations of the Mindanao Current and the strength of the ENSO signal.