Eddy-induced transport through the Luzon Strait critically affects the physical and biological properties of the South China Sea (SCS). The eddy-induced volume, heat and salt transport are comprehensively evaluated based on the South China Sea Physical Oceanic Dataset (SCSPOD) observations. To avoid the bias involved in extreme eddy events, 76 shedding anticyclonic eddies, 46 shedding cyclonic eddies, 29 locally formed anticyclonic eddies and 40 locally formed cyclonic eddies from 1993 to 2018 are taken into account and merged into composites. The total annual intrusions of volume, heat and salt contributed by all four types of eddies are 0.77 Sv, 8.78 × 10^?4 PW and 7.88 × 104 kg·s^?1, respectively. The statistical analysis shows that annual eddy-induced intrusion accounts for 11.3%–38.9% of the upper-layer Luzon Strait transport, which highlights the non-negligible role of eddies in water exchange through the Luzon Strait.

有多少热量和盐分由中尺度涡输运到南中国海？

中文摘要：涡旋引起的通过吕宋海峡的输运过程，对南中国海的物理和生物特性起到了关键作用。基于南海物理海洋数据集（SCSPOD）的观测结果，涡旋引起的体积、热量和盐分输运得到了全面的评估。为了避免极端涡旋事件引起的偏差，本研究将 1993 年至 2018 年的 76 个脱落反气旋涡、46 个脱落气旋涡、29 个局地形成的反气旋涡和 40 个局地形成的气旋涡纳入研究范围，并作合成分析。这四种类型的涡旋所贡献的水体体积、热量和盐分的年输运量分别为0.77Sv、8.78×10^-4PW和7.88×10⁴kg·s^-1。统计分析结果表明，每年由涡旋引起的水体输运量占吕宋海峡上层输运量的11.3%-38.9%，这一结果显示，涡旋在吕宋海峡水体交换过程中起到了不可忽视的作用。