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学术奇米第四色在线影院

【8月7日10:30】中山米奇电影网刘少锋副教授:Further improvement of surface flux estimation in the unstable surface layer based on LES data

米奇影视777米奇电影网110周年校庆学术活动之土木工程与力学奇米网学术奇米第四色在线影院:
  应土木工程与力学奇米网、西部灾害与环境力学教育部重点实验室黄宁教授、张洁青年教授邀请,中山米奇电影网刘少锋副教授于2019年8月6-7日来我校进行学术交流并做学术奇米第四色在线影院,欢迎广大师生参加。

  • 奇米第四色在线影院题目:Further improvement of surface flux estimation in the unstable surface layer based on LES data
  • 人:刘少锋 副教授
  • 奇米第四色在线影院时间:2019年8月7日(星期三)10:30-11:30
  • 奇米第四色在线影院地点:祁连堂322学术奇米第四色在线影院厅
  • 人:
奇米第四色在线影院人简介

刘少锋,中山米奇电影网大气科学奇米网副教授,中山米奇电影网“百人计划”青年杰出人才。2002年本科毕业于南京信息工程米奇电影网(原南京气象奇米网),2008年毕业于中科院大气物理研究所,获理学博士学位,后留所工作,任助理研究员。2010年到德国科隆米奇电影网访问,2011年3月起正式在德国科隆米奇电影网工作,任研究科学家。2017年5月起在中山米奇电影网大气科学奇米网工作。主要从事陆面过程、边界层湍流、环境模拟等方面的研究。目前正主持国家自然科学基金面上项目一项、中山米奇电影网百人计划项目一项,曾主持国家自然科学基金青年项目,参加国家863计划、德国DFG 、国家重点研发计划、国家自然科学基金重点项目等多个项目,发表高水平学术论文10多篇。

奇米第四色在线影院摘要

The Monin-Obukhov similarity theory (MOST) is widely used for the surface turbulence flux-gradient relations in modeling and data analysis. Here we quantify multi-scale turbulence processes by applying our newly developed analysis technique to large-eddy simulation data, and find that in the unstable surface layer, large convective eddies (with the scaling of boundary layer depth) and local free convection exist in addition to small eddies. An empirical MOST function (considering the last two processes only) is found to underestimate the surface friction velocity and heat flux both by about 30%. Much better results can be obtained using a function that explicitly considers all three processes. Generally, the non-dimensional wind shear exhibits larger scatter and deviates more from the MOST than the temperature gradient. Based on these results, we propose the revised Sorbjan (1986) function (with coefficients determined from this study) for wind shear and MOST function for temperature gradient, for estimating surface fluxes in the unstable surface layer. The three-dimensional multi-scale analysis method we develop in this study is of general nature and can be of interest for problems of three-dimensional multi-scale process description in other disciplines.

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