Simulation of the mixed layer at OWS November and Papa with several models
Simulation of the mixed layer at OWS November and Papa with several models
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DOI：
10.1029/jc090ic01p00903
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发表时间：
1985-01
影响因子：
--
通讯作者：
P. Martin
中科院分区：
文献类型：
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作者：
P. Martin
Mellor-Yamada 2 级和 2 1/2、Niiler 和 Garwood 一维混合层模型通过一些简单的强迫实验进行了比较，并通过模拟 1961 年 11 月和 Papa 海洋站混合层的变化进行了测试。海洋站模拟表明，可以调整模型以给出相当好的结果。然而，改变位置时需要重新调整模型常数，这表明某些混合参数化还有改进的空间。研究了模型模拟对某些“外部”参数化的敏感性，包括表面热通量、海水浊度和混合层下方的环境扩散率。人们发现，长达一年的模拟对海水浊度非常敏感。将浊度从 Jerlov 光学 I 型增加到 III 型会导致 11 月月平均 SST 最大增加 3°C 或更多。夏季混合层仍很浅时，模拟对海水浑浊度最敏感。对于环境扩散率，从 0.4 cm2/s 降低到 0.01 cm2/s 会导致 11 月和 Papa 月平均海温分别最大增加 0.5 和 1.5°C。使用恒定环境扩散率的效果在夏末季节性温跃层最强时最为明显。由于帕帕的夏季季节性温跃层更强，因此帕帕的影响比 11 月更大。 11 月和 Papa 的最佳结果是通过使用观察到的光学水类型（分别为 I 和 II）和相对较小的环境扩散率值（小于 0.2 cm2/s）获得的。
The Mellor-Yamada level-2 and 2 1/2, Niiler, and Garwood one-dimensional mixed-layer models were compared for some simple forcing experiments and were tested by simulating changes in the mixed layer at ocean stations November and Papa for the year 1961. The ocean station simulations show that the models can be tuned to give fairly good results. However, the need to readjust model constants when changing locations suggests that there is room for improving some of the mixing parameterizations. The sensitivity of the model simulations to certain “external” parameterizations, including surface heat flux, seawater turbidity, and ambient diffusivity below the mixed layer, was investigated. The year-long simulations were found to be very sensitive to the seawater turbidity. Increasing the turbidity from Jerlov optical type I to type III causes a maximum increase in the monthly mean SST at November of 3°C or more. The simulations are most sensitive to seawater turbidity during summer when the mixed-layer remains shallow. For the ambient diffusivity a decrease from 0.4 to 0.01 cm2/s results in a maximum increase in the monthly mean SST at November and Papa of 0.5 and 1.5°C, respectively. The effects of using a constant ambient diffusivity are most noticeable in late summer when the seasonal thermocline is strongest. The effects are larger at Papa than at November because of the stronger summer seasonal thermocline at Papa. Best results at November and Papa were obtained by using the observed optical water types (I and II, respectively) and relatively small values for ambient diffusivity (less than 0.2 cm2/s).