塔克拉玛干沙漠夏季晴空对流边界层大涡模拟

王敏仲; 徐洪雄; 王寅钧; 买买提艾力&#183;买买提依明; 张建涛

doi:10.7522/j.issn.1000-694X.2018.00028

中国沙漠 >

2018 , Vol. 38 >Issue 6: 1275 - 1286

DOI: https://doi.org/10.7522/j.issn.1000-694X.2018.00028

天气与气候

塔克拉玛干沙漠夏季晴空对流边界层大涡模拟

王敏仲 ,
徐洪雄 ,
王寅钧 ,
买买提艾力·买买提依明 ,
张建涛

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1. 中国气象科学研究院灾害天气国家重点实验室, 北京 100081;
2. 中国气象局乌鲁木齐沙漠气象研究所, 新疆乌鲁木齐 830002

王敏仲(1979-),男,甘肃民勤人,副研究员,主要从事沙漠边界层气象领域的研究。E-mail:wangmz@idm.cn

收稿日期: 2018-03-07

修回日期: 2018-03-28

网络出版日期: 2018-12-05

基金资助

国家自然科学基金项目（91644223，41575008，41775030）；国家公益性行业（气象）科研专项（GYHY201406001）

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Large-Eddy Simulation of Summer Clear Sky Convective Boundary Layer in the Taklimakan Desert

Wang Minzhong ,
Xu Hongxiong ,
Wang Yinjun ,
Ali Mamtimin ,
Zhang Jiantao

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1. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;
2. Institute of Desert Meteorology, Chinese Meteorological Administration, Urumqi 830002, China

Received date: 2018-03-07

Revised date: 2018-03-28

Online published: 2018-12-05

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摘要

为了探索塔克拉玛干沙漠夏季晴空对流边界层湍流结构和热对流运动规律，利用沙漠腹地探空及地表通量观测资料，开展了晴空对流边界层的大涡模拟研究。结果表明：（1）沙漠夏季晴空条件下，对流边界层湍能主要由地表热力浮力对流产生，机械剪切对边界层湍能的贡献较小，小尺度湍涡对湍能的耗散随高度呈减弱趋势，边界层湍能变化呈现间歇性特点。（2）沙漠夏季晴空边界层中存在着有组织的热对流泡现象，热泡最大上升速度可超过4.0 m·s^-1；沙漠热对流运动一般呈羽状和网状分布特征，在上升运动区周围伴随有大片的下沉辐散区域。（3）地表感热和逆温层顶盖强度是控制和影响沙漠对流边界层发展的两个重要因素，感热增大，对流边界层变暖且高度升高；感热减小，对流边界层变冷且高度降低。在感热不变的条件下，逆温层顶盖强度越强，越不利于对流边界层发展，反之则相反。

关键词： 塔克拉玛干沙漠; 晴空; 对流边界层; 大涡模拟; 热对流泡; 湍流动能

本文引用格式

王敏仲 , 徐洪雄 , 王寅钧 , 买买提艾力·买买提依明 , 张建涛 . 塔克拉玛干沙漠夏季晴空对流边界层大涡模拟[J]. 中国沙漠, 2018 , 38(6) : 1275 -1286 . DOI: 10.7522/j.issn.1000-694X.2018.00028

Abstract

Large-eddy simulation of clear sky convective boundary layer is carried out with sounding and surface flux observation data in the hinterland of Taklimakan Desert so as to explore the structure of the turbulence and the law of heat convection of summer clear sky boundary layer in the Desert. The study shows that:(1) Under the summer clear sky in the Taklimakan Desert, the boundary layer turbulent kinetic energy is mainly generated by the surface thermal buoyancy convection. The dissipation of turbulent kinetic energy triggered by small-scale eddy weakens as the increase of the height. The variation of the boundary layer turbulent kinetic energy has the feature of intermission.(2) Organized thermal bubbles appear in the boundary layer. The maximum ascending speed of the thermal bubbles exceeds 4.0 m·s^-1; the thermal convection in Taklimakan Desert generally shows the pinnate and network-like distribution, with a large area of sinking divergence around the upward motion area.(3) The surface sensible heat and the intensity at the top of the inversion layer are two important factors controlling and influencing the development of the convective boundary layer in Taklimakan Desert. If the sensible heat increases, the boundary layer becomes warmer and its height also increases; if the sensible heat decreases, the boundary layer becomes colder and its height also decreases. When the sensible heat remains the same, the stronger the intensity at the top of the inversion layer is, the more negative influence it will have on the development of the convective boundary layer, vice versa.

Key words： Taklimakan Desert; clear sky; convective boundary layer; large-eddy simulation; thermal bubble; turbulent kinetic energy

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