Chemical stratification in thermally stratified lakes: A chloride mass balance model
Chemical stratification in thermally stratified lakes: A chloride mass balance model
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DOI：
10.4319/lo.2005.50.1.0147
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发表时间：
2005-01
影响因子：
4.5
通讯作者：
A. Rimmer;Y. Aota;M. Kumagai;W. Eckert
中科院分区：
文献类型：
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作者：
A. Rimmer;Y. Aota;M. Kumagai;W. Eckert
在热分层湖泊中，富营养化的低层和贫营养化的上层是一个共同的特征。这些层之间的垂直混合影响地球化学和生物过程。我们使用氯离子作为惰性示踪剂来模拟控制化学分层的主要因素，并确定湖泊范围内的混合过程。分层湖被视为两个完全混合的水库分开的温跃层。根据Kinneret湖（以色列）和琵琶湖（日本）的温度、水化学和水文数据的长期记录，预测了每月的下湖和上湖氯化物浓度，并根据测得的氯化物浓度曲线进行了测试。温跃层加深期间各层之间的水体积交换是使用质量平衡计算的。我们发现，在epilimnetic和hypolimnetic库存的惰性示踪剂（氯化物）的变化对应定量计算的水质量交换，因此，反映混合。我们的惰性示踪剂的方法提供了一个操作手段的基础上量化的垂直混合过程中热分层湖泊独立于热预算。
In thermally stratified lakes, nutrient‐enriched hypolimnion and a nutrient‐depleted epilimnion is a common feature. Vertical mixing between these layers affects geochemical and biological processes. We used chloride ion as an inert tracer to model the main factors controlling the chemical stratification and to identify lake‐wide mixing processes. The stratified lake is treated as two completely mixed reservoirs separated by the thermocline. Based on the long‐term records of temperature, hydrochemical, and hydrological data from Lake Kinneret (Israel) and Lake Biwa (Japan), monthly hypolimnetic and epilimnetic chloride concentrations were predicted and tested against measured chloride concentration profiles. Water‐volume exchange between the layers during the thermocline deepening was calculated using mass balance. We found that changes in the epilimnetic and hypolimnetic inventories of an inert tracer (chloride) correspond quantitatively to the calculated water mass exchange, and as such, reflect mixing. Our inert‐tracer‐approach provides a basis for an operational means of quantifying the vertical mixing process in thermally stratified lakes independently from the heat budget.