【摘要】 通过分析深海潜标系统的实际观测海流数据对2013年赤道印度洋上层Wyrtki急流(WJ)的变异进行了研究,发现WJ在2013年呈现明显异常变化,主要表现为春季WJ强度略强于同年秋季WJ。再分析资料的分析结果也同样验证此结论,而这与气候态WJ的演化特征相反。在气候平均态下,印度洋春季WJ强度远弱于秋季WJ强度。进一步数据分析与数值模式结果表明,2013年春季WJ异常加强与赤道印度洋海表风场变化密切相关,而春季海表风场的变化主要归因于2013年春季异常增强的季节内振荡(ISO)事件,发生在2013-05的ISO对流位相是导致春季印度洋海表西风异常的直接原因。本研究揭示了中小时间尺度海气相互作用可以影响更长时间尺度海洋环流系统的年际变化。更多还原

【Abstract】 In-situ measurements of the upper ocean currents reveal remarkable abnormal behavior of Wyrtki Jet in boreal spring in tropical Indian Ocean in 2013.The Wyrtki Jet in boreal spring was unusually stronger than its counterpart in fall,clearly against previous understanding,and this phenomenon is also demonstrated by reanalysis data.Further analysis and numerical experiments show that the anomalously enhanced Wyrtki Jet is related to the surface wind anomaly in equatorial Indian Ocean,which is resulted from the strong intra-seasonal oscillation(ISO)event in that season.This study show that mesoscale air-sea interaction can influence relatively large scale ocean current on interannual timescale.更多还原