The relationship between double-diffusive intrusions and staircases in the Arctic Ocean
The relationship between double-diffusive intrusions and staircases in the Arctic Ocean
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DOI：
10.1175/jpo-d-16-0265.1
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
Y. Bebieva;M. Timmermans
中科院分区：
文献类型：
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作者：
Y. Bebieva;M. Timmermans
摘要针对北冰洋温度和盐度随深度增加的特殊背景，探讨了北冰洋双扩散阶梯的成因。基于温盐侵入和双扩散阶梯共存的观测结果，对控制方程进行了线性稳定性分析，以确定阶梯形成的条件。结果表明，如果观测到的总体垂直密度比低于为特定的横向和垂直背景温度和盐度梯度估计的临界垂直密度比，则双扩散阶梯可能是交错运动造成的。在决定是否形成楼梯时，垂直背景温度和盐度梯度主导于水平梯度，线性理论表明，对更强的垂直温度梯度的扰动更有可能产生楼梯。北冰洋温度和盐度测量的检查。
AbstractThe origin of double-diffusive staircases in the Arctic Ocean is investigated for the particular background setting in which both temperature and salinity increase with depth. Motivated by observations that show the coexistence of thermohaline intrusions and double-diffusive staircases, a linear stability analysis is performed on the governing equations to determine the conditions under which staircases form. It is shown that a double-diffusive staircase can result from interleaving motions if the observed bulk vertical density ratio is below a critical vertical density ratio estimated for particular lateral and vertical background temperature and salinity gradients. Vertical background temperature and salinity gradients dominate over horizontal gradients in determining whether staircases form, with the linear theory indicating that perturbations to stronger vertical temperature gradients are more likely to give rise to a staircase. Examination of Arctic Ocean temperature and salinity measurements...