Characteristics of the surface mixed layer depths in the northern South China Sea in spring
Characteristics of the surface mixed layer depths in the northern South China Sea in spring
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春季南海北部表层混合层深度特征
DOI：
10.1007/s10872-016-0351-7
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发表时间：
2016-01
影响因子：
2.3
通讯作者：
Mao Huabin
中科院分区：
文献类型：
--
作者：
Qiu Chunhua;Cui Yongsheng;Ren Jie;Wang Qiang;Huo Dan;Wu Jiaxue;Liu Huan;Mao Huabin
南海北部中国海区混合层深度的性质和特征尚不清楚。利用现场资料，我们检验了不同MLD定义的质量，研究了MLD的空间和日变化，并探讨了2014年3月23-31日期间混合层发展的机制。我们对MLD进行了不同的计算；其中两个是(A)两个不同温度(0.20.6℃)之间的深度和(B)两个密度差(0.125，0.25g/m~3)之间的深度；第五个计算是从最优线性拟合法得出的深度。我们发现，最优线性适应度MLD是我们研究区域的最佳定义，并且从陆架到斜坡是加深的。在船舶停泊时，观测到了MLDs和混合层的24小时日变化。混合层以湍流耗散率为特征。我们发现混合层经历了一个“稳定-衰减-发展”的过程。在稳定期，MLD接近混合层，但在衰变/发展期，MLD比混合层大/小。我们认为，速度切变和浮力通量在混合层的发展中都是重要的。我们定量地研究了陆架地区的混合机制，确定了海-气净热通量是主要因素，而不是风速或海流速度。
The nature and characteristics of the mixed layer depth (MLD) remain uncertain in the northern South China Sea. Using in situ data, we examined the quality of different MLD definitions, investigated the spatial and diurnal variation in the MLD, and examined the mechanisms of mixed layer development during March 23–31, 2014. We made distinct calculations of the MLD; of which two are (a) the depths between two different temperatures (0.2, 0.6 °C) and (b) the depths between two density differences (0.125, 0.25 kg/m3); and the fifth calculation is a depth derived from the optimal linear fitness method. We found that the optimal linear fitness MLD was the best definition for our study region ,and that it deepened from the shelf to the slope. Twenty-four-hour diurnal variation in the MLDs and mixing layers was observed when the ship was moored. Mixing layers were characterized by turbulent dissipation rates. We found that the mixed layer underwent a ‘stable-decaying–developing’ process. During the stable period, the MLD was close to that of the mixing layer, but during the decay/development periods, the MLDs were larger/smaller than those of the mixing layers. We suggest that both velocity shear and buoyancy flux were important in mixed layer development. We quantitatively examined the mechanisms of mixing in the shelf region, with air–sea net heat flux determined to be the major factor, rather than wind speed or current velocity.
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