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首页> 外文期刊>Journal of Physical Oceanography >Coastline Direction, Interannual Flow, and the Strong El Nino Currents along Australia's Nearly Zonal Southern Coast
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Coastline Direction, Interannual Flow, and the Strong El Nino Currents along Australia's Nearly Zonal Southern Coast

机译：澳大利亚近乎南部地区南部海岸的海岸线方向，年际流量和强烈的厄尔尼诺现象

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The western equatorial Pacific Ocean El Nino signal leaks through the gappy western equatorial Pacific Ocean boundary to the western and southern coasts of Australia. Ocean Topography Experiment (TOPEX)/Poseidon sea level data and coastal tide gauge measurements show that off the northwest coast the low-frequency signal propagates westward as large-scale Rossby waves. However, along the nearly zonal southern coast, particle displacements are nearly zonal near the coast and experience no planetary vorticity change. As a consequence, the Rossby wave mechanism fails, and theory suggests that the signal should decay from the shelf edge with baroclinic Rossby radius-of-deformation scale. High-resolution along-track TOPEX/Poseidon sea level heights show that the interannual height signal does decay rapidly seaward of the shelf edge with this scale. The sharp fall in sea level and geostrophic balance imply strong (～10 cm s~(-1)) low-frequency currents seaward of the shelf edge. On the shelf, interannual Bow is in the same direction as the shelf-edge flow but is much weaker. The anomalous flows tend to be eastward during La Nina, when the western equatorial Pacific and Australian coastal sea levels are unusually high, and westward during El Nino when coastal sea levels tend to be anomalously low. The anomalous low-frequency flows can transport larvae large distances, enhancing the recruitment of Australian salmon to nursery grounds in the eastern part of the southern coast when the coastal sea level is higher than normal and decreasing recruitment when it is lower than normal.
机译：赤道西太平洋的厄尔尼诺信号通过松散的赤道西太平洋边界泄漏到澳大利亚的西海岸和南海岸。海洋地形实验（TOPEX）/波塞冬（Poseidon）海平面数据和沿海潮汐仪测量结果表明，在西北海岸附近，低频信号随着大比例的Rossby波向西传播。但是，在接近纬向的南部海岸，粒子位移接近海岸附近的纬向，并且没有行星涡度变化。结果，Rossby波动机制失效，理论认为信号应以斜压Rossby形变半径标度从架子边缘衰减。高分辨率沿航迹的TOPEX / Poseidon海平面高度表明，年际高度信号的确在该比例下迅速衰减了架子边缘的海向。海平面的急剧下降和地转平衡意味着架子边缘向海方向强烈的（〜10 cm s〜（-1））低频电流。在架子上，年际弯曲与架子边缘流动的方向相同，但弱得多。在拉尼娜期间，赤道西太平洋和澳大利亚沿海海平面异常偏高，异常流量倾向于向东；在厄尔尼诺现象期间，当沿海海平面异常偏低时，异常流量倾向于向西。异常的低频水流可将幼体远距离运输，当沿海海平面高于正常水平时，增强了澳大利亚鲑鱼向南部沿海东部的苗圃地的吸收，而当其低于正常水平时，则减少了其吸收。

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