The Indonesian Throughflow response to Indo‐Pacific climate variability
The Indonesian Throughflow response to Indo‐Pacific climate variability
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DOI：
10.1002/2013jc009533
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发表时间：
2014-02
影响因子：
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通讯作者：
J. Sprintall;A. Révelard
中科院分区：
文献类型：
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作者：
J. Sprintall;A. Révelard
印度尼西亚通流（ITF）是热带纬度太平洋和印度洋盆地之间唯一开放的洋间交换通道。 ITF 运输变化的代理时间序列是使用遥感高度计数据开发的。重点是龙目岛、翁拜和帝汶的三个流出通道，它们共同将整个 ITF 输送到印度洋，并且可以直接测量速度来帮助验证输送算法的真实性。由此产生的 18 年代理时间序列显示出强烈的 ITF 年际变化。龙目海峡上层和帝汶航道整个深度都出现运输增加的显着趋势，这可能与 20 世纪 90 年代初以来太平洋信风增强有关。通过每个主要流出通道的总 ITF 传输的划分根据印度洋偶极子 (IOD) 或厄尔尼诺南方涛动 (ENSO) 的相位而变化。一般来说，太平洋 ENSO 变化在帝汶航道最强，很可能是受到从太平洋沿澳大利亚西北部陆架路径传播的行星波的影响。有点令人惊讶的是，同时发生的厄尔尼诺事件和正 IOD 事件始终显示出与纯粹为厄尔尼诺事件构建的合成结果相矛盾的结果。这在龙目岛和翁拜海峡尤其明显，而且在帝汶海峡深处也很明显。这表明，在同时发生的 ENSO 和 IOD 事件期间，印度洋动力学可能会胜过太平洋动力学，从而控制通过流出通道的运输。
The Indonesian Throughflow (ITF) is the only open pathway for interocean exchange between the Pacific and Indian Ocean basins at tropical latitudes. A proxy time series of ITF transport variability is developed using remotely sensed altimeter data. The focus is on the three outflow passages of Lombok, Ombai, and Timor that collectively transport the entire ITF into the Indian Ocean, and where direct velocity measurements are available to help ground-truth the transport algorithm. The resulting 18 year proxy time series shows strong interannual ITF variability. Significant trends of increased transport are found in the upper layer of Lombok Strait, and over the full depth in Timor Passage that are likely related to enhanced Pacific trade winds since the early 1990s. The partitioning of the total ITF transport through each of the major outflow passage varies according to the phase of the Indian Ocean Dipole (IOD) or El Nino-Southern Oscillation (ENSO). In general, Pacific ENSO variability is strongest in Timor Passage, most likely through the influence of planetary waves transmitted from the Pacific along the Northwest Australian shelf pathway. Somewhat surprisingly, concurrent El Nino and positive IOD episodes consistently show contradictory results from those composites constructed for purely El Nino episodes. This is particularly evident in Lombok and Ombai Straits, but also at depth in Timor Passage. This suggests that Indian Ocean dynamics likely win out over Pacific Ocean dynamics in gating the transport through the outflow passages during concurrent ENSO and IOD events.