Modeling the upper ocean dynamics in the Subantarctic and Polar Frontal zones in the Australian sector of the Southern Ocean
Modeling the upper ocean dynamics in the Subantarctic and Polar Frontal zones in the Australian sector of the Southern Ocean
复制标题
模拟南大洋澳大利亚部分亚南极和极锋区的上层海洋动力学
DOI：
10.1029/2000jc000357
复制
发表时间：
2001
影响因子：
--
通讯作者：
R. Matear
中科院分区：
文献类型：
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作者：
Xiujun Wang;R. Matear
在亚南极区（SAZ）和极锋区（PFZ）采用一维（1-D）混合层模式（Chen方案）模拟了上层海洋动力学。该模型采用了来自国家环境预测中心的4年热通量、淡水通量和风应力数据。在SAZ和PFZ，一维模式都能够再现季节海表温度（SST）的振幅和混合层深度（MLD）的季节性。最浅的MLD出现在1 - 2月（特别经济区20 m，特别保护区35 m），最深的MLD出现在8 - 10月（特别经济区600 m，特别保护区160 m）。由于风应力较低，南区夏季MLD较PFZ浅。然而，由于混合层下水体的强分层作用，PFZ冬季MLD较SAZ浅。夏季风应力变异性是驱动区域MLD波动的主要因素，冬季热通量变异性是控制混合层加深和浅化时间的主要因素。在夏季和冬季，风应力和热通量的变率都主导着MLD的变率。
A one-dimensional (1-D) mixed layer model (the Chen scheme) was applied in the Subantarctic Zone (SAZ) and the Polar Frontal Zone (PFZ) to simulate the upper ocean dynamics. The model was forced with 4 years data of the heat fluxes, freshwater fluxes, and wind stresses from the National Centers for Environmental Prediction. In both the SAZ and PFZ, the 1-D model was capable of reproducing the amplitude of the seasonal sea surface temperature (SST) and the seasonally of the mixed layer depth (MLD). The shallowest MLD was found in January-February (20 m in the SAZ, 35 m in the PFZ), and the deepest MLD was found between August and October (600 m in the SAZ, 160 m in the PFZ). The summer MLD was shallower in the SAZ than in the PFZ due to the lower wind stress. However, the shallower winter MLD in the PFZ than in the SAZ was due to the strong stratification in the water below the mixed layer. In the SAZ, variability in the wind stress was the dominant term driving the fluctuation in MLD in the summer, but variability in the heat flux was the major factor controlling the timing of the deepening and shoaling of the mixed layer in the winter. In the PFZ both the variability in the wind stress and the heat flux dominated the variability of the MLD in both the summer and the winter.