GSTDTAP
DOI10.1029/2019GL085361
Convection-Diffusion Competition Within Mixed Layers of Stratified Natural Waters
Steiner, Oscar Sepulveda1; Bouffard, Damien2; Wueest, Alfred1,2
2019-11-20
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2019
卷号46期号:22页码:13199-13208
文章类型Article
语种英语
国家Switzerland
英文摘要

In stratified natural waters, convective processes tend to form nearly homogeneous mixed layers. However, shear-driven turbulence generated by large-scale background flow often rapidly smooths them through mixing with the stratified surroundings. Here we studied the effect of background turbulence on convectively driven mixed layers for the case of bioconvection in Lake Cadagno, Switzerland. Along with microstructure measurements, a diffusive-shape model for the mixed layers allowed us to define (i) mixed layer thickness and (ii) diffusive transition length. Further microstructure analysis was performed allowing estimation of convective turbulence in the mixed layer and shear-driven turbulence quantified by eddy diffusion in their surroundings. Based upon these results, we propose a Peclet number scaling that relates mixed layer shape to the opposing effects of convection and diffusion. We further validate this quantitative approach by applying it to two other distinct convective systems representative of double-diffusive convection and radiatively driven under-ice convection.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000497264300001
WOS关键词LAKE ; TURBULENCE ; DISSIPATION ; BACTERIA ; BALANCE
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/225063
专题环境与发展全球科技态势
作者单位1.Ecole Polytech Fed Lausanne, Inst Environm Engn, Margaretha Kamprad Chair, Phys Aquat Syst Lab, Lausanne, Switzerland;
2.Eawag Swiss Fed Inst Aquat Sci & Technol, Dept Surface Waters Res & Management, Kastanienbaum, Switzerland
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GB/T 7714
Steiner, Oscar Sepulveda,Bouffard, Damien,Wueest, Alfred. Convection-Diffusion Competition Within Mixed Layers of Stratified Natural Waters[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(22):13199-13208.
APA Steiner, Oscar Sepulveda,Bouffard, Damien,&Wueest, Alfred.(2019).Convection-Diffusion Competition Within Mixed Layers of Stratified Natural Waters.GEOPHYSICAL RESEARCH LETTERS,46(22),13199-13208.
MLA Steiner, Oscar Sepulveda,et al."Convection-Diffusion Competition Within Mixed Layers of Stratified Natural Waters".GEOPHYSICAL RESEARCH LETTERS 46.22(2019):13199-13208.
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