Abstract The performance of vertical parameterization schemes, namely, turbulent kinetic energy (TKE) and K-profile parameterization (KPP), is evaluated over the domain [30E-120E; 20S-30N] in the Indian Ocean using the Nucleus for European Modeling of the Ocean (NEMO) regional model. The surface and sub-surface hydrography and mixed layer depth (MLD) of the simulations using TKE and KPP schemes have been compared. The KPP scheme produces higher bias (∼0.5 °C) of sea surface temperature (SST) in monsoon and post-monsoon seasons, which reduces on using the TKE scheme. The maximum surface salinity difference (0.45 psu) between TKE and KPP simulations is obtained over the head Bay of Bengal (BoB) in the post-monsoon months. The KPP scheme also overestimates MLD of the region. Barring highly convective regions as well as regions marked with very low and rapidly changing salinity, the TKE scheme performs better than KPP scheme in simulating the hydrography and MLD of the region. The differences between TKE and KPP simulations in the vertical stability and mixing are studied using buoyancy frequency, vertical shear of horizontal currents and energy required for mixing as quantifiers. The mixed layer heat budget analysis explains seasonal variability of SST and differences in vertical mixing parameterizations.

中文翻译：

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比较热带印度洋上的湍流动能和 K 剖面参数化垂直参数化方案的性能

摘要 垂直参数化方案的性能，即湍动能 (TKE) 和 K 剖面参数化 (KPP)，在域 [30E-120E; 20S-30N] 在印度洋使用 Nucleus for European Modeling of the Ocean (NEMO) 区域模型。已经比较了使用 TKE 和 KPP 方案的模拟的表面和亚表面水文和混合层深度 (MLD)。KPP 方案在季风和季风后季节产生更高的海面温度 (SST) 偏差（~0.5 °C），这减少了 TKE 方案的使用。TKE 和 KPP 模拟之间的最大表面盐度差异 (0.45 psu) 是在季风后几个月孟加拉湾 (BoB) 上空获得的。KPP 计划也高估了该地区的 MLD。除了强对流区域以及盐度极低且变化迅速的区域外，TKE 方案在模拟该区域的水文和 MLD 方面比 KPP 方案表现更好。使用浮力频率、水平流的垂直剪切和混合所需的能量作为量词，研究了 TKE 和 KPP 模拟在垂直稳定性和混合方面的差异。混合层热量收支分析解释了 SST 的季节性变化和垂直混合参数化的差异。水平流的垂直剪切和混合所需的能量作为量词。混合层热量收支分析解释了 SST 的季节性变化和垂直混合参数化的差异。水平流的垂直剪切和混合所需的能量作为量词。混合层热量收支分析解释了 SST 的季节性变化和垂直混合参数化的差异。