Turbulen t - Eddy Closure Scheme for Two - D imen sional Homogeneous Turbulen t Shear Flow

Journal of Arid Meteorology ›› 2010, Vol. 28 ›› Issue (1): 20-25.

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Turbulen t - Eddy Closure Scheme for Two - D imen sional Homogeneous Turbulen t Shear Flow

ZHAO Jianhua, ZHANG Qiang

Institute of A rid M eteorology, China M eteorological Adm inistration; Key Laboratory of A rid Clim ate Change and Reducing
Disaster of Gansu Provinc; Key Open Laboratory of Clim atic Change and D isaster Reduction of CMA, Lanzhou 730020, China

Received:2009-11-24 Revised:2009-12-12 Online:2010-04-01 Published:2010-04-01
Supported by:
湖南省重大科技专项“湖南省极端气象灾害预警评估技术体系研究与示范”（2008FJ1006）资助

2009年盛夏湖南持续高温干旱及同期大气环流异常分析

罗伯良, 彭莉莉, 张　超

湖南省气象科学研究所，湖南　长沙　410007

作者简介:罗伯良（１９６５－），男，湖南邵阳人，高级工程师，从事气候诊断与预测．Ｅ－ｍａｉｌ：ｌｕｏｂａｉｌｉａｎｇ＠１６３．ｃｏ
基金资助:
湖南省重大科技专项“湖南省极端气象灾害预警评估技术体系研究与示范”(2008FJ1006)资助

Abstract

Abstract:

After anatomizing the typ ical experiments for turbulence by Thorpe andWoods et al. , some results are obtained as follows:(1) a Taichimodel for turbulence is brought forward; (2) The cascade of turbulence includes two basic contents: one is the small -scale eddies resulted from the large - scale eddies by their inward - rotation motions, the other is the hypo - scale eddies originated from the frontwhich is a bigger - speed - shear interface separating the fluids from each other; (3) The dissipative mechanism of turbulence is associated with the frontwhich always tends to be drawn very long. As a result, the interface linking two fluids is extended infinitely and the p rocess of the molecular diffusion between the interface is then highly enhanced to achieve the high effective diffusion of turbulence; (4) An eddy closure scheme is brought forward to close the Reynolds equations; (5) The mixing length is equal to the outer radius of a turbulent eddy, while Karman constant is a function of ratio of inner radius to outer radius of the eddy; (6) By the ideas of operator and turbulent operator, the actual turbulent dynamical equations are deduced; (7) The invariance p rincip le of relationship is brought forward. What’smore, counter - gradient transport and eddy relationology are also discussed.

Key words: turbulent eddymodel, closure scheme of eddy, Karman constant, turbulent operator, invariance principle of relationship

摘要：

利用湖南省97个台站降水、气温资料、NCEP/NCAR再分析资料，分析了2009年8月湖南持续高温干旱的时空分布及同期大气环流的异常特征。结果表明：高温时段从8月中旬初开始一直持续到下旬后期，其中8月中旬到下旬高温范围和持续时间大部分地区为1959年以来最严重的时段。西太平洋副热带高压面积偏大、强度偏强、西伸脊点偏西，湖南地区在副高控制下，盛行下沉气流是引起持续高温干旱的直接原因。从南海到湖南地区存在经向水汽输送的负异常中心，这种水汽输送形势有利于持续高温干旱的发展。

关键词: 持续高温, 大气环流, 水汽输送, 异常

CLC Number:

P468.0⁺2

LUO Ba-Liang, BANG Chi-Chi, ZHANG 　Chao.

Turbulen t - Eddy Closure Scheme for Two - D imen sional Homogeneous Turbulen t Shear Flow[J]. Journal of Arid Meteorology, 2010, 28(1): 20-25.

罗伯良, 彭莉莉, 张　超. 2009年盛夏湖南持续高温干旱及同期大气环流异常分析[J]. 干旱气象, 2010, 28(1): 20-25.

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Turbulen t - Eddy Closure Scheme for Two - D imen sional Homogeneous Turbulen t Shear Flow

2009年盛夏湖南持续高温干旱及同期大气环流异常分析

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