Calculating salinity variance fluxes using isohaline coordinates
Calculating salinity variance fluxes using isohaline coordinates
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DOI：
10.1016/j.ecss.2021.107311
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发表时间：
2021-03
影响因子：
2.8
通讯作者：
Linjiang Li;Jianrong Zhu;L. F. Pareja‐Roman
中科院分区：
文献类型：
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作者：
Linjiang Li;Jianrong Zhu;L. F. Pareja‐Roman
垂直盐度方差（SV）的预算来自使用等盐总交换流（TEF）框架，与平流的垂直SV量化的盐度类跨截面的分散。以长江口的一个数值模型为例，说明了该方法的应用。分析的重点是北槽（NC）段，在小潮期间产生强烈的分层。结果表明，在小潮初期，由于层化水向陆地的漂移，垂直SV平流比水平SV平流强。然而，强偏北风可以显着减少垂直SV平流的贡献，但增加水平SV平流到NC由于向陆地输送的相对较好的混合盐水。这一过程增加了南部海峡垂直SV的向海平流。此外，我们强调，垂直SV耗散（混合）项平衡的应变项和峰值在小潮后期在NC，符合最大体积集成的垂直SV。
Vertical salinity variance (SV) budgets are derived using the isohaline Total Exchange Flow (TEF) framework, with the advection of vertical SV quantified by the dispersion of salinity classes across sections. A numerical model of the Changjiang Estuary is used to demonstrate the application of this method. The analysis is focused on the North Channel (NC) segment where strong stratification is produced during neap tides. We find that the advection of vertical SV is stronger than that of horizontal SV during early neap due to the landward excursion of stratified water. However, strong northerly winds can significantly decrease the contribution of advection of vertical SV but increase the advection of horizontal SV into the NC due to the landward transport of relatively well-mixed saline water. This process increases the seaward advection of vertical SV in the southern channels. In addition, we highlight that the vertical SV dissipation (mixing) term balances the straining term and peaks at late neap in the NC, coinciding with the maximum volume-integrated vertical SV.