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Interannual spring Wyrtki jet variability and its regional impacts

机译：年际春季Wyrtki射流变异及其区域影响

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The role of spring Wyrtki jets in modulating the equatorial Indian Ocean and the regional climate is an unexplored problem. The source of interannual variability in the spring Wyrtki jets is explored in this study. The relationship between intraseasonal and interannual variability from 1958 to 2008 and its relation with Indian Summer Monsoon is further addressed. Analysis reveals that the interannual variability in spring Wyrtki jets is controlled significantly by their intraseasonal variations. These are mostly defined by a single intraseasonal event of duration 20 days or more which either strengthens or weakens the seasonal mean jet depending on its phase. The strong spring jets are driven by such intraseasonal westerly wind bursts lasting for 20-days or more, whereas the weak jets are driven by weaker intraseasonal westerlies. During the years of strong jets, the conventional westward phase propagation of Wyrtki jets is absent and instead there is an eastward phase propagation indicating the possible role of Madden Julian Oscillation (MJO) in strengthening the spring Wyrtki jets. These strong intraseasonal westerly wind bursts with eastward phase propagation during strong years are observed mainly in late spring and have implications on June precipitation over the Indian and adjoining land mass. Anomalously strong eastward jets accumulate warm water in the eastern equatorial Indian Ocean (MO), leading to anomalous positive upper ocean heat content and supporting more local convection in the east. This induces subsidence over the Indian landmass and alters monsoon rainfall by modulating monsoon Hadley circulation. In case of weak current years such warm anomalies are absent over the eastern EIO. Variations in the jet strength are found to have strong impact on sea level anomalies, heat content, salinity and sea surface temperature over the equatorial and north Indian Ocean making it a potentially important player in the north Indian Ocean climate variability. (C) 2017 Elsevier B.V. All rights reserved.
机译：春季Wyrtki喷气机在调节赤道印度洋和区域气候中的作用是一个尚未探索的问题。这项研究探讨了春季Wyrtki喷气机年际变化的根源。 1958年至2008年的季节内和年际变化之间的关系及其与印度夏季风的关系得到了进一步的解决。分析表明，春季Wyrtki喷气机的年际变化受其季节内变化的显着控制。这些主要由持续时间为20天或更长时间的单个季节内事件定义，该事件根据季节的不同而增强或减弱季节性平均喷射。强烈的春季喷气机是由这种持续20天或更长时间的季节内西风爆发驱动的，而弱喷气机是由较弱的季节内西风驱动的。在强喷气机的岁月中，不存在Wyrtki喷气机的常规西向传播，相反，存在向东传播，这表明Madden Julian摆动（MJO）在增强春季Wyrtki喷气机中可能发挥了作用。这些强烈的季节内西风向爆发，在强年期间向东传播，主要在春季末期观测到，并影响了印度及附近陆地的六月降水。异常强的东风急流在赤道东印度洋（MO）上积聚热水，导致异常的正洋热量升高，并支持东部更多的局部对流。这会引起印度陆地上的沉降，并通过调节季风Hadley环流来改变季风降雨。在当前年份较弱的情况下，东部EIO不会出现这种温暖的异常现象。发现射流强度的变化对赤道和北印度洋的海平面异常，热量含量，盐度和海面温度有很大影响，使其成为北印度洋气候变化的潜在重要参与者。 （C）2017 Elsevier B.V.保留所有权利。

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