Microstructure measurements of velocity shear from the continental slope of the northwest coast of India (NWCI) in the eastern Arabian Sea are used to quantify the relative importance of double diffusion and internal tides induced diapycnal mixing in the different depth layers. It is found that the hydrographic conditions in the NWCI are conducive to the formation of moderately strong salt fingering (Turner angle between 55° and 72°). However, salt finger-induced vertical mixing dominates only in the upper 180 m of the water column, below which intense shear-driven turbulent mixing due to internal tide reduces its significance. As a result of this, the staircase structures, a measure of salt finger dominance in the water column, are frequent, and the mean temperature change across the interface (DT_IH; 0.33 °C) is relatively larger in the upper 180 m compared to sporadic occurrence of steps with a small magnitude of DT_IH (0.18 °C) below 180 m. It is also found that in the upper 180 m of the water column in the NWCI, mean diapycnal diffusivity (K_ρ) is approximately a factor of eight larger (8.3 ± 1.3 × 10⁻⁵ m²s⁻¹) than the estimation in the open ocean region of the eastern Arabian sea (5.4 ± 1.1 × 10⁻⁶ m² s⁻¹). However, due to internal tides, the magnitude of K_ρ reaches as large as O (10⁻²) m² s⁻¹ below 180 m in the NWCI. The mean downward heat flux estimated in the salt finger-dominated (upper 180 m) layers is ∼ -6.1 Wm^-2, and the shear-driven mixing-dominated layers (below 180 m) is ∼ -10.2 Wm^-2.

阿拉伯海东部印度西北海岸（NWCI）大陆坡速度切变的微观结构测量用于量化不同深度层中双扩散和内潮汐引起的二重混合的相对重要性。研究发现，西北水利枢纽的水文条件有利于形成中等强度的盐指效应（特纳角在55°～72°之间）。然而，盐指引起的垂直混合仅在水体上部 180 m 处占主导地位，低于该高度，由于内潮汐导致的强烈剪切驱动的湍流混合降低了其重要性。因此，作为水柱中盐指优势的衡量标准的阶梯结构很频繁，并且与上层 180 m 相比，界面上的平均温度变化 ( DT _{IH ;} 0.33 °C) 相对较大180 m 以下零星出现小幅度DT _IH (0.18 °C) 的台阶。还发现，在 NWCI 水柱上部 180 m 中，平均二重扩散率 ( K _ρ ) 大约比估算值大 8 倍 (8.3 ± 1.3 × 10 ^-5 m ² s ^{-1 )。}阿拉伯海东部的公海区域（5.4 ± 1.1 × 10 ^-6  m ²  s ^-1）。然而，由于内潮汐的影响，NWCI中180 m以下K _ρ的大小达到O (10 ^-2 ) m ² s ^{-1 。}盐指主导层（上部 180 m）的平均向下热通量估计为 ~ -6.1 Wm ^-2，剪切驱动混合主导层（低于 180 m）为 ~ -10.2 Wm ^-2。