山地复杂下垫面湍流特征观测分析  

Analysis on Turbulent Flux in Complex Underlying Surface Conditions

作　　者：杨胜朋[1] 吕世华[1] 陈玉春[1] 奥银焕[1] 蒋熹[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所西部气候环境与灾害实验室

出　　处：《高原气象》2008年第2期272-278,共7页Plateau Meteorology

基　　金：中国科学院“西部之光”项目“兰州市南北两山绿化气候环境效益评估的观测和数值模拟研究”(2005403);中国科学院寒区旱区环境与工程研究所引进人才基金项目“兰州市绿化对气候与环境影响效应的数值试验研究”(0684291001)共同资助

摘　　要：利用谱方法和能量闭合度分析等方法,对兰州市皋兰山2006年夏季和2005年冬季涡度相关系统测定的湍流数据质量进行了分析,结果表明:4个观测点测定的三维风速、空气温度的功率谱在惯性副区都符合"-2/3"定律,垂直风速和温度的协谱在惯性副区也基本符合"-4/3"定律。4个观测点都存在能量平衡不闭合现象,夏季观测点绿化地和裸地能量平衡比率(EBR)分别为66%和94%,冬季绿化地和裸地的EBR分别为62%和84%;裸地观测点的闭合程度明显好于绿化地。本文还讨论了能量闭合度的日变化特征及各个观测点的地表能量收支状况。Using the methods of spectral analysis and energy balance closure the quality of turbulent data collected from the filed experiment conducted in the Gaolan Mountain in summer of 2006 and in winter of 2005 was analyzed.The results show that the energy spectra and cospectra were in agreement with the ／!-2/3／＂ and ／!-4/3／＂ scaling law corresponding in inertial sub-range.The energy imbalance was found in all observational sites.The energy balance ratio（EBR） was 66% and 94% in the afforestation soil and in the bare soil in the summer sites,and the corresponding value was 62% and 84% in the winter sites,which showed that the EBR in bare soil was better than that in afforestation soil.The diurnal variation of energy balance closure and surface energy budget were also discussed.

关 键 词：皋兰山 涡度相关 谱分析 能量平衡闭合 

分 类 号：P404[天文地球—大气科学及气象学]