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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >The source of the Leeuwin Current seasonality
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The source of the Leeuwin Current seasonality

机译：Leeuwin当前季节性的来源

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The seasonal circulation around the southwestern boundary of Australia is documented using sea level anomalies from satellite altimetry. Results extrapolated to the coast agree closely with tide gauge observations indicating that seasonal altimeter fields are realistic. Monthly sea level maps identify an annual propagating wave along a waveguide extending along the shelf edge, from the Gulf of Carpentaria to southern Tasmania. The annual sea level pulse does not originate from the Pacific Ocean, as annual Pacific sea level variations are completely out of phase with signals south of the Indonesian archipelago. The presence of a phase discontinuity is demonstrated in annual sea level, temperature, and salinity observations. The origin of the Leeuwin Current seasonality is in the Gulf of Carpentaria where monsoonal winds drive a massive buildup of sea level from November to December. During December–February, a sea level "pulse" emerges from the region, and rapidly propagates poleward along the western and southern Australian boundary. In the broad shelf region centered at 198S, an independent process forms a high sea level feature when a positive heat flux anomaly induces an annual increase in sea surface temperature which is rapidly mixed through the water column by the strong regional tides. In March, the winds relax and switch to a downwelling favorable alongshore component. In this period, the sea level pulse is essentially in a quasistatic equilibrium with the annual propagating wind systems. The change in cross-shelf sea level gradient along the 8000 km path length at the western and southern boundaries, drives the seasonal changes in the Leeuwin Current flow.
机译：使用卫星测高仪的海平面异常记录了澳大利亚西南边界附近的季节性环流。外推到海岸的结果与潮汐仪的观测结果非常吻合，表明季节性的高度计领域是现实的。每月的海平面图确定了一条沿着波导管的年度传播波，波导管沿架子边缘延伸，从卡彭塔里亚湾到塔斯马尼亚南部。年度海平面脉冲并非来自太平洋，因为年度太平洋海平面变化与印尼群岛南部的信号完全不同步。在年度海平面，温度和盐度观测中可以证明存在相位不连续性。 Leeuwin Current季节性的起源是在卡彭塔里亚海湾，那里的季风风从11月到12月导致海平面大量积聚。在12月至2月期间，该地区出现了海平面“脉冲”，并沿澳大利亚西部和南部边界向极点迅速传播。在以198S为中心的宽阔陆架区域，当正热通量异常引起海面温度逐年升高时，一个独立的过程便形成了高海平面特征，而该区域表面的强潮将其迅速混入水柱中。在三月，风缓和并转为向下涌流有利的沿海地区。在此期间，海平面脉冲与年度传播的风系统基本处于准静态平衡状态。西部和南部边界沿8000 km路径长度的跨架海平面梯度的变化驱动了Leeuwin Current流的季节性变化。

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