Tides of the Ross Sea and Ross Ice Shelf cavity
Tides of the Ross Sea and Ross Ice Shelf cavity
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DOI：
10.1017/s0954102003001032
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发表时间：
2003-02
影响因子：
1.6
通讯作者：
L. Padman;S. Erofeeva;I. Joughin
中科院分区：
文献类型：
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作者：
L. Padman;S. Erofeeva;I. Joughin
介绍了两种新的罗斯海海潮模型，其中包括罗斯冰架下的海洋空洞。预测冰架表面高度变化的最佳模型是基于同化来自罗斯冰架的重力潮汐成分。合成孔径雷达干涉图提供了模型性能的独立测试。潮高变率的标准差在沿Shirase海岸和simple海岸的东部冰架下最大，可超过0.8 m。该地区最大峰间潮差为~ 3米。对于冰锋以北的海潮流，最好的预测是一个基于动力学的模型，它用底栖生物摩擦的线性表示来解决深度积分浅水方程，而不是更常见的二次形式。开阔的罗斯海上的潮汐流主要是由昼夜的、地形上捕获的涡度波控制的。在罗斯海西北部沿上大陆坡的狭窄带中，最强的模拟流在大潮时超过1 m s - 1。罗斯海中央陆架区的典型潮流为10 ~ 20 cm s−1。在冰架下，典型的海流为~ 5 cm s−1。
Two new ocean tide models for the Ross Sea including the ocean cavity under the Ross Ice Shelf, are described. The optimum model for predicting ice shelf surface height variability is based on assimilation of gravimetry-derived tidal constituents from the Ross Ice Shelf. Synthetic aperture radar interferograms provide an independent test of model performance. The standard deviation of tide height variability is largest under the eastern ice shelf along the Shirase and Siple Coasts, where it can exceed 0.8 m. The maximum peak-to-peak tidal range in this region is ∼3 m. The best predictor for ocean tidal currents north of the ice front is a dynamics-based model that solves the depth-integrated shallow water equations with a linear representation of benthic friction rather than the more usual quadratic form. Tidal currents over the open Ross Sea are dominated by diurnal, topographically trapped vorticity waves. The strongest modelled currents exceed 1 m s−1 at spring tide in a narrow band along the upper continental slope in the north-western Ross Sea. Typical tidal currents in the central continental shelf area of the Ross Sea are 10–20 cm s−1. Under the ice shelf the typical currents are ∼5 cm s−1.