On thermal staircases formed in process of multiple-diffusive convection in lakes
On thermal staircases formed in process of multiple-diffusive convection in lakes
复制标题
湖泊多次扩散对流过程中形成的热阶梯
DOI：
10.2208/prohe.41.463
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Fuminori Obayashi
中科院分区：
文献类型：
--
作者：
K. Okubo;Shigetake Nagai;Fuminori Obayashi
咸水或浑浊的侵入作用在湖泊中形成了以稳定/不稳定界面为界的热阶梯结构。野外和实验阶梯的热态瑞利数和溶态/浊态瑞利数都得到了估算，其中，只要颗粒尺寸小于10微米，泥沙和盐指之间的瑞利数就有微小的差别。在湖中观察到的形成温度跳跃较大的楼梯的快速手指被发现在深海中处于盐手指的状态。具有热振荡的不稳定阶梯在有沉降率的热混浊扩散区向下移动，而在热溶情况下是静止的。浊度瑞利数通常小于盐度瑞利数，但较强的温盐在近地层稳定度处也向下移动。
Thermal step structure bounded by stable/unstable interface is formed in lakes due to saline or turbid intrusion. Both thermal and solutal/turbid Rayleigh numbers were estimated for field and experimental staircases, among which, minor difference between silt and salt fingers was noticed as long as the particle size was less than ten microns. Rapid fingers forming a staircase with larger temperature jumps observed in a lake were found to be in the regime of salt fingers in deep oceans. Unstable staircase with thermal oscillation, moved downward in thermo-turbid diffusive regime with a settling rate, while it was static in thermo-solutal case. Turbidity Rayleigh number is usually smaller than salinity one, but strong thermohaline also moved down at the merginal stability.