A new offshore transport mechanism for shoreline‐released tracer induced by transient rip currents and stratification
A new offshore transport mechanism for shoreline‐released tracer induced by transient rip currents and stratification
复制标题
瞬态离岸流和分层引起的海岸线释放示踪剂的新型海上传输机制
DOI：
10.1002/2017gl072611
复制
发表时间：
2017
影响因子：
5.2
通讯作者：
F. Feddersen
中科院分区：
文献类型：
--
作者：
Nirnimesh Kumar;F. Feddersen
人们对早期幼虫和病原体从海岸线穿过内陆架的离岸运输知之甚少，但这对于了解幼虫的命运和污染海岸线水的稀释至关重要。通过瞬态离岸流（TRC）产生的海浪区域模型和海洋环流模型的新颖耦合，我们表明，喷射到分层内陆架上的瞬态离岸流会引发一条新的、以前未考虑的近海输送路径。对于南加州秋季典型的入射波和层化，该机制会俯冲海浪区起源示踪剂，并将其以 1.2 km/d 的速度传送到离岸至少 800 m，类似于海洋前缘的俯冲。这种机制需要 TRC 和分层。由于 TRC 无处不在，而且内架通常是分层的，因此这种机制可能在将早期幼虫、病原体或其他示踪剂输出到架子上方面发挥重要作用。
Offshore transport from the shoreline across the inner shelf of early‐stage larvae and pathogens is poorly understood yet is critical for understanding larval fate and dilution of polluted shoreline water. With a novel coupling of a transient rip current (TRC) generating surf zone model and an ocean circulation model, we show that transient rip currents ejected onto a stratified inner shelf induce a new, previously unconsidered offshore transport pathway. For incident waves and stratification typical for Southern California in the fall, this mechanism subducts surf zone‐origin tracers and transports them at least 800 m offshore at 1.2 km/d analogous to subduction at ocean fronts. This mechanism requires both TRCs and stratification. As TRCs are ubiquitous and the inner shelf is often stratified, this mechanism may have an important role in exporting early‐stage larvae, pathogens, or other tracers onto the shelf.