Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China.
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China.
Sci Rep. 2016 Jul 20;6:29688. doi: 10.1038/srep29688.
In-situ measurement of the upper ocean velocity discloses significant abnormal behaviors of two Wyrtki Jets (WJs) respectively in boreal spring and fall, over the tropical Indian Ocean in 2013. The two WJs both occurred within upper 130 m depth and persisted more than one month. The exceptional spring jet in May was unusually stronger than its counterpart in fall, which is clearly against the previous understanding. Furthermore, the fall WJ in 2013 unexpectedly peaked in December, one month later than its climatology. Data analysis and numerical experiments illustrate that the anomalous changes in the equatorial zonal wind, associated with the strong intra-seasonal oscillation events, are most likely the primary reason for such anomalous WJs activities.
对上层海洋速度的现场测量揭示了 2013 年热带印度洋中两个 Wyrtki 射流（WJ）分别在春季和秋季的显著异常行为。这两个 WJ 都发生在上层 130 米深度内，并持续了一个多月。5 月异常强劲的春季射流明显强于秋季射流，这与以往的认识明显相悖。此外，2013 年秋季的 WJ 出人意料地在 12 月达到峰值，比其气候学时间晚了一个月。数据分析和数值实验表明，与强季节内震荡事件相关的赤道纬向风的异常变化很可能是这种异常 WJ 活动的主要原因。
