Interannual variability of the Indonesian Throughflow: The salinity effect
Interannual variability of the Indonesian Throughflow: The salinity effect
复制标题
印度尼西亚流量的年际变化：盐度效应
DOI：
10.1002/2015jc011495
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发表时间：
2016-04-01
影响因子：
3.6
通讯作者：
Sprintall, Janet
中科院分区：
文献类型：
--
作者：
Hu, Shijian;Sprintall, Janet
印度尼西亚的对流（ITF）地区具有很强的混合和经验显着的淡水输入，但在印度尼西亚海域的盐度变化的作用仍然不清楚。本研究的目的是了解盐度变化如何影响ITF输送年际时间尺度。ITF运输使用观测和同化数据集计算，并使用直接ITF运输估计进行验证。我们发现ITF运输的盐构组分占总ITF变异的（36 +/- 7）%，而热构组分占（63 +/- 6）%。因此，虽然不占主导地位，但这一结果意味着，在印度尼西亚海域的盐度变化是显着的重要性，在确定ITF运输的年际变化。相关分析表明，总ITF输送的年际变化主要受厄尔尼诺-南方涛动（ENSO）的影响，而不是印度洋偶极子。在ENSO循环下，步行者环流的纵向变化，导致在印度尼西亚海域的降水波动，调节盐度，并随后影响ITF运输的年际变化。这一结果信号的重要性，降水和随后的盐度影响，在确定的年际变化的ITF运输。风强迫和海洋行星波的作用也重新使用这个新计算的ITF运输系列。ENSO相关的风强迫被发现调制ITF运输通过Rossby波通过波导在印度尼西亚海域，这是与以前的研究。
The Indonesian Throughflow (ITF) region possesses strong mixing and experiences significant freshwater input, but the role of salinity variability in the Indonesian Seas remains unclear. The goal of this study is to understand how salinity variability influences the ITF transport on interannual time scales. The ITF transport is calculated using observations and assimilation data sets and verified using direct ITF transport estimates. We find that the halosteric component of the ITF transport contributes (36 +/- 7)% of the total ITF variability, in contrast to (63 +/- 6)% by the thermosteric component. Thus, while not dominant, this result nonetheless implies that the salinity variability in the Indonesian Seas is of remarkable importance in determining the interannual variability of ITF transport. Correlation analysis indicates that the interannual variability of the total ITF transport is mainly influenced by the El Nino-Southern Oscillation (ENSO) rather than the Indian Ocean Dipole. Under the ENSO cycle, the Walker Circulation shifts longitudinally resulting in fluctuations in precipitation over the Indonesian Seas that modulates salinity and subsequently influences the interannual variability of ITF transport. This result signals the importance of precipitation and the subsequent salinity effect in determining the interannual variability of the ITF transport. The role of wind forcing and oceanic planetary waves is also revisited using this newly calculated ITF transport series. ENSO-related wind forcing is found to modulate the ITF transport via Rossby waves through the wave guide in the Indonesian Seas, which is in agreement with previous studies.