The relationship between Arabian Sea upwelling and Indian Monsoon revisited in a high resolution ocean simulation
The relationship between Arabian Sea upwelling and Indian Monsoon revisited in a high resolution ocean simulation
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DOI：
10.1007/s00382-017-3599-8
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发表时间：
2017
期刊：
影响因子：
4.6
通讯作者：
X. Yi;B. Hünicke;N. Tim;E. Zorita
中科院分区：
文献类型：
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作者：
X. Yi;B. Hünicke;N. Tim;E. Zorita
基于沉积物记录、海面温度和风的研究表明，阿拉伯海西海岸的上升流受到印度夏季风的强烈影响。我们在过去61年由大气再分析驱动的涡旋解析全球海洋模拟风暴中直接研究了这种关系。凭借其非常高的空间分辨率(10公里)，STORM使我们能够识别上升流系统的特征。我们分析了1950-2010年间上升流与气象和海洋变量之间的协变性。分析表明，沿海上升流与沿岸风应力(r = 0.73)和海面温度(r = −0.83)具有很高的年际相关性。然而，上升流与季风之间的相关性很小。我们发现了一种不同于驱动季风的大气环流模式，它是上升流变率的主要调制器。尽管如此，与阿拉伯海上升流或季风有关的温度异常模式在空间上非常相似，尽管这些联系的物理机制不同。此外，在我们模拟的阿拉伯海上升流中没有发现任何长期趋势。
Studies based on sediment records, sea-surface temperature and wind suggest that upwelling along the western coast of Arabian Sea is strongly affected by the Indian summer Monsoon. We examine this relationship directly in an eddy-resolving global ocean simulation STORM driven by atmospheric reanalysis over the last 61 years. With its very high spatial resolution (10 km), STORM allows us to identify characteristics of the upwelling system. We analyse the co-variability between upwelling and meteorological and oceanic variables from 1950 to 2010. The analysis reveals high interannual correlations between coastal upwelling and along-shore wind-stress (r = 0.73) as well as with sea-surface temperature (r = −0.83). However, the correlation between the upwelling and the Monsoon is small. We find an atmospheric circulation pattern different from the one that drives the Monsoon as the main modulator of the upwelling variability. In spite of this, the patterns of temperature anomalies that are either linked to Arabian Sea upwelling or to the Monsoon are spatially quite similar, although the physical mechanisms of these links are different. In addition, no long-term trend is detected in our modelled upwelling in the Arabian Sea.