干旱区生态环境知识资源中心(Arid): 黑河下游额济纳绿洲近地层湍流输送特征研究

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	黑河下游额济纳绿洲近地层湍流输送特征研究
其他题名	A study on the boundary layer turbulence transfer over the Ejina oasis in the lower reach of the Heihe River
	张艳武 1; 黄静 2; 吴统文 1
ISSN	0577-6619
出版年	2009
卷号	67 期号:3 页码:433-441
中文摘要	分析2003年9月5-27日在黑河下游额济纳绿洲取得的近地面层湍流观测资料,讨论无量纲湍流方差与稳定度参数Z/L的关系.无量纲风速分量sigma_u/u_、sigma_v/u_和sigma_w/_u在不稳定层结与稳定度Z/L满足1/3次方时,符合Monin-Obkuhov相似理论.在近中性时,sigma_u/u_、sigma_w/u_值比平坦下垫面的略小些,sigma_v/u_值比平坦下垫面的略大.无量纲温度脉动方差和湿度脉动方差在对流状态下与Z/L满足-1/3次方,在稳定和不稳定层结下,随\|Z/L\|减小而增大.地面热量以感热输送为主,感热通量峰值约为250 W/m~2,潜热通量的峰值为170 W/m~2;夜间潜热通量较小,感热通量则出现负值.动量通量日间平均在0.2-0.3 N/m~2,峰值为0.31 N/m~2.黑河下游绿洲柽柳林动力学粗糙度比HEIFE戈壁及其他绿洲下垫面的大,中性时z_(0m)=0.47551 m.中性状态下动量整体输送系数C_D=22.210~(-3),不稳定层结时平均值C_D=10.310~(-3),稳定层结时平均值C_D=7.2 * 11~(-3).热量整体输送系数C_H,中性状态下C_H=3.2 * 10~(-3),不稳定层结时平均值为C_H=3.310~(-3),稳定层结时平均值为C_H=2.710~(-3).
英文摘要	The turbulent data observed over the Ejina oasis in the lower reaches of the Heihe River from September 5 to 27, 2003 are used to investigate the relation between dimensionless turbulent wind variance and stability parameter Z/L. The results show that under the unstable stratified condition, the stability parameter (Z/L) dependence on sigma_u/u_* ,sigma_v, and sigma_w/u_* , can be fit to a power with a power index of 1/3, in accordance with the Monin-Obkuhov similarity theory. Under the near neutral condition, sigma_u/u_* and sigma_w/u_(sigma_v/u_) over the oasis are slightly smaller (larger) than that over a flat underlying surface. Under the convective condition, the stability parameter (Z/L) dependence on the variance of dimensionless temperature and that of specific humidity fluctuations can be fit to a power law with an index of- 1/3, and under both the stable and unstable stratifications, the variance increases with the reduction of \|Z/L\| . The sensible heat flux is the dominant component of the surface heat flux, with a peak value of about 250 W/m~2 , while that of the latent heat is 170 W/m~2 ; and in the nighttime the latent heat flux becomes even smaller, whereas the sensible heat flux becomes negative. In the daytime, the momentum flux ranges from 0.2 to 0. 3 N/m~2 with a peak value of 0.31 N/m~2. The aerodynamic roughness length in the Ejina Tamarisk scrub is larger than that over the Gobi and other types of underlying oasis surfaces in the HEIFE, with Z_(0m) = 0.47551 m under the neutral stratification. The bulk momentum transfer coefficient C_d under the neutral, unstable, and stable stratifications are 22.2 * 10~(-3), 10.3* 10~(-3), and 7.2* 10~(-3), respectively and the corresponding values of the bulk heat transfer coefficient C_H are 3.2 * 10~(-3) , 3.3 * 10~(-3) , and 2.7 * 10~(-3).
中文关键词	绿洲 ; 湍流特征 ; 动力学粗糙度 ; 整体输送系数
英文关键词	Oasis Turbulent characteristics Aerodynamic roughness length Bulk transfer coefficient
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:3508907
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223986
作者单位	1.中国气象局,国家气候中心, 国家气候中心气候研究开放实验室, 北京 100081, 中国; 2.国家气象中心, 北京 100081, 中国
推荐引用方式 GB/T 7714	张艳武,黄静,吴统文. 黑河下游额济纳绿洲近地层湍流输送特征研究[J],2009,67(3):433-441.
APA	张艳武,黄静,&吴统文.(2009).黑河下游额济纳绿洲近地层湍流输送特征研究.,67(3),433-441.
MLA	张艳武,et al."黑河下游额济纳绿洲近地层湍流输送特征研究".67.3(2009):433-441.