三种垂向混合方案对 HYCOM模拟能力的影响

摘要

基于 HYCOM 设计了3组数值试验,分别采用 KPP(K-Profile Parameterization),KT(Kraus and Turner), MY(Mellor and Yamada)2.5三种垂向混合方案,比较分析了这3种混合方案对全球大洋的模拟能力。结果表明：KPP 方案和 MY2.5方案模拟的温度场十分类似,在中高纬度几乎一致,在赤道断面上 MY2.5方案的最大误差小于 KPP 方案,对于暖池区 SST 的模拟 MY2.5方案的误差也稍小于 KPP 方案,但二者的差别并不明显。在模拟赤道潜流时,MY2.5方案暴露出明显不足,其模拟效果要明显差于 KPP 方案和 KT 方案。KT 方案模拟效果的好坏依赖于混合层底的确定是否准确,其在中高纬度海域的模拟效果要明显优于热带海域。总之,在热带海域,KPP 方案的模拟整体效果最好,在中高纬度海域,KPP 方案和 MY2.5方案差别不大,而 KT 方案则更适用于中高纬度。%Performance of three different kinds of vertical mixing schemes are compared using the HY-COM.The three schemes are K-Profile Parameterization (KPP)scheme,Kraus and Turner (KT)scheme and Mellor-Yamada level 2.5 (MY2.5)scheme,respectively.In extra-tropics,the performances of KPP and MY2.5 schemes are similar in simulating temperature fields,while in tropical ocean,MY2.5 performs better,in particular in the equatorial region and the Western Pacific warm pool.However,as to the simu-lation of the EUC,KPP scheme is significantly better than MY2.5 scheme and MY2.5 scheme is the worst one among the three schemes.The performance of KT scheme depends on whether the MLD is prescribed correctly or not,and its simulation of temperature field is more realistic in extra-tropical ocean than in tropical ocean.In general,KPP scheme has better performance in the tropical ocean,which is much close to observation,while in extra-tropical ocean there is little difference between KPP and MY2.5 schemes, and KT scheme have a better performance in this region compared with its result in tropical ocean.