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Temperature front (TF) is one of the important features in the Yellow Sea, which forms in spring, thrives in summer, and fades in autumn as thermocline declines. TF intensity |ST| is defined to describe the distribution of TF. Based on the MASNUM wave-tide-circulation coupled model, temperature distribution in the Yellow Sea was simulated with and without tidal effects. Along 36°N, distribution of TF from the simulated results are compared with the observations, and a quantitative analysis is introduced to evaluate the tidal effects on the forming and maintaining processes of the TF. Tidal mixing and the circulation structure adapting to it are the main causes of the TF. 相似文献
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特征线计算格式下共轭方程两种导出途径的比较 总被引:1,自引:0,他引:1
共轭方程的导出是建立资料同化模型的关键,其导出方式有两种途径:AFD形式与FDA形式。在特征线计算格式基础上针对一类较广泛海洋动力控制方程分析了其两种共轭方程(AFD形式与FDA形式)之间的关系,并将理论结果应用于波谱共轭方程的讨论。 相似文献
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从观测数据角度出发,考察海浪与上层海洋混合层深度的变化关系。采用卫星高度计和三套温度观测数据,利用改进的混合层深度提取方法,获得海洋混合层深度。简要分析了多年月平均的有效波高和混合层深度的空间分布特征及时间变化规律,并进一步分析了它们的相关性。二者直接相关性分析的结果表明,在南北半球的中纬度地区二者的相关系数较大,而赤道地区较小。滤除年周期的气候态月平均场后,计算的距平相关系数在赤道区域较小;但在太平洋东部、南部和南印度洋存在一个大值区。此外,进一步研究了有效波高和混合层深度年际距平的相关系数,其空间分布特征与二者的距平相关系数的分布特征类似。为探究混合层深度的影响因素,同时也分析了风场与混合层深度的相关系数。综合上述结果,海浪和上层海洋的混合层深度之间存在着一定的相关性,海浪过程是风输入能量向次表层海洋传播的一个重要途径。 相似文献
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Based on the MASNUM wave-tide-circulation coupled numerical model, the temperature structure along 35°N in the Yellow Sea was simulated and compared with the observations. One of the notable features of the temperature structure along 35°N section is the double cold cores phenomena during spring and summer. The double cold cores refer to the two cold water centers located near 122°E and 125°E from the depth of 30m to bottom. The formation, maintenance and disappearance of the double cold cores are discussed. At least two reasons make the temperature in the center (near 123°E) of the section higher than that near the west and east shores in winter. One reason is that the water there is deeper than the west and east sides so its heat content is higher. The other is invasion of the warm water brought by the Yellow Sea Warm Current (YSWC) during winter. This temperature pattern of the lower layer (from 30m to bottom) is maintained through spring and summer when the upper layer (0 to 30m) is heated and s 相似文献
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Comparison of TOPEX/POSEIDON altimeter derived wave period with ocean buoy data in the East China Sea and South China Sea 总被引:2,自引:0,他引:2
Altimeter wave period data obtained from continental shelf seas are analyzed in this paper. Empirical models are introduced for zero up-crossing and peak wave period calculation with TOPEX/POSEIDON data. Their performances are assessed using independent validation dataset in four sites in the open ocean of China. To provide more accurate wave period estimation, new coefficients are applied to reliable in situ data. Comparison of our estimated the wave periods with new linear calibrations based on independent data of Seapac 2100 deployed in the East China Sea and South China Sea showed that the accuracy was improved over estimates determined from earlier empirical models. Regional analysis indicated that the wave period model works better under wind sea condition. 相似文献
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Wave-induced mixing in the Yellow Sea 总被引:3,自引:0,他引:3
Vertical wave-induced mixing parameter Bv expressed in wave number spectrum was estimated in the Yellow Sea. The spatial distributions of By averaged over upper 20 m in 4 seasons were analyzed. It is the strongest in winter because of winter monsoon, and the weakest in spring. Since in summer it plays an important role for circulation of upper layers, its vertical structure was also discussed. Two simulations with and without wave-induced mixing in this season were performed to evaluate its effect on temperature distribution. Numerical results indicate that wave-induced mixing could increase the mixed layer thickness greatly. 相似文献
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研究了波致底切应力和二维辐射应力对悬沙的作用.首先对东山湾的水动力进行了数值模拟并与实测资料进行了对比检验,然后对东山湾悬浮泥沙进行了考虑波浪和不考虑波浪两种情况下的数值模拟并与实测资料进行了相关对比分析.在模式建立过程中,依据东山湾独特的窄口型半封闭河口海湾的特点,基于ECOMSED模式(2002)建立了东山湾三维水动力模型,并通过第三代海浪模式MASNUM加入了波浪对底切应力及辐射应力的影响,通过ECOMSED中的底边界层模型考虑了波浪增强底摩擦的作用,综合分析了东山湾的水动力及泥沙状况.结果表明在东山湾数值模拟中,该模式能较好地模拟这类海域的水动力及泥沙输运状况.在东山湾模拟计算中,潮流的作用强于波浪的作用,但考虑波浪因素后,泥沙模拟结果更好.在波浪的作用中,底切应力相比于二维辐射应力占有绝对的优势,两者相差2个量级以上,因此可以不考虑二维辐射应力的影响. 相似文献