Mixing in a salinity variance budget of the Salish Sea is controlled by river flow
Mixing in a salinity variance budget of the Salish Sea is controlled by river flow
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DOI：
10.1175/jpo-d-21-0227.1
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发表时间：
2022-06
影响因子：
3.5
通讯作者：
Erin M. Broatch;P. MacCready
中科院分区：
文献类型：
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作者：
Erin M. Broatch;P. MacCready
盐度变化框架被用来研究萨利什海的混合，一个大的海湾河口。实际数值模式的输出被用来为萨利什海内的各个盆地编制2017-2019年的盐度差异预算。盐度方差预算被用来量化每个流域的混合并估计数值混合，这被发现贡献了模式中总混合的三分之一。惠德贝盆地由于水深浅，河流流量大，混合作用最强烈。与以前用盐度变化方法研究的大多数其他河口系统不同，Salish海的混合受河流流量控制，不表现出明显的大潮循环。“混合度”分析被用来确定混合水何时从河口排出。河道流量与混合排水密切相关，但耦合不如混合紧密。由于混合与河流流量高度相关，长期平均近似M=QrSoutSin可以用来预报Salish海和普吉特海湾的混合，即使没有任何时间平均也可以得到很好的精度。在三年的平均值上，普吉特海湾的混合与交换流量的盐分输送直接相关。
A salinity variance framework is used to study mixing in the Salish Sea, a large fjordal estuary. Output from a realistic numerical model is used to create salinity variance budgets for individual basins within the Salish Sea for 2017-2019. The salinity variance budgets are used to quantify the mixing in each basin and estimate the numerical mixing, which is found to contribute about one-third of the total mixing in the model. Whidbey Basin has the most intense mixing, due to its shallow depth and large river flow. Unlike in most other estuarine systems previously studied using the salinity variance method, mixing in the Salish Sea is controlled by the river flow and does not exhibit a pronounced spring-neap cycle. A “mixedness” analysis is used to determine when mixed water is expelled from the estuary. The river flow is correlated with mixed water removal, but the coupling is not as tight as with the mixing. Because the mixing is so highly correlated with the river flow, the long-term average approximation M = QrSoutSin can be used to predict the mixing in the Salish Sea and Puget Sound with good accuracy, even without any temporal averaging. Over a three-year average, the mixing in Puget Sound is directly related to the exchange flow salt transport.