| 青藏高原东部拉萨河下游地区大气湍流交换特征研究 |
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| 引用本文： | 杨斌,袁祺,谭昌海,张功,郑宁,谷良雷.青藏高原东部拉萨河下游地区大气湍流交换特征研究[J].高原气象,2022(1):204-215. |
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| 作者姓名： | 杨斌 袁祺 谭昌海 张功 郑宁 谷良雷 |
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| 作者单位： | 1. 中国地质调查局自然资源综合调查指挥中心;2. 中国林业科学研究院林业研究所;3. 中山大学大气科学学院;4. 中国科学院西北生态环境资源研究院寒旱区陆面过程与气候变化重点实验室;5. 中国科学院西北生态环境资源研究院那曲高寒气候环境观测研究站 |
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| 基金项目： | 中国地质调查局青藏高原自然资源要素综合观测试点项目（DD20208064）；;国家重点研发计划项目（2018YFC1505701）； |
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| 摘 要： | 地气之间物质和能量随湍流运动进行输送,涡度相关技术是研究地气交换过程和评估大气资源的重要手段,它对湍流特征和精确的通量观测研究具有重要的作用。本研究利用拉萨蔡公堂通量站的闭路涡度相关系统,观测了2020年8-11月青藏高原东部拉萨河下游地区典型高寒草甸下垫面的通量特征,并分析了该区域生长季和非生长季不同大气稳定条件下湍流谱特征和相似性规律。结果表明:(1)生长季时期(8-9月),净生态系统CO2交换(NEE)日均值为-2.3 gC·m-2·d-1,蒸散(ET)日均值为1.8 mm·d-1,非生长季时期(10-11月),NEE日均值为1.1 gC·m-2·d-1,ET日均值为0.3 mm·d-1;(2)三维(u,v和w)方向的湍流风速和温度的归一化谱具有明显的惯性副区,谱密度曲线斜率符合-2/3规律,垂直方向(w)湍流风速分别和温度、CO2和H2O等气体浓度的归一化协谱曲线斜率较高于-4/3;(3)生长季和非生长季时期大气稳定度的日变化相似,主要随动量通量的增加而降低,但各方向风速的归一化标准差(σ/u*)拟合结果不同,生长季时期,σu/u*、σv/u*和σw/u*分别为2.84、2.73和1.07,非生长季时期三者增加,分别为3.23、3.19和1.22,其非生长季时期水平方向风速归一化标准差增加较明显。利用闭路涡度相关系统可以较好地观测本研究区通量特征,并且分别考虑生长季和非生长季时期湍流风速的相似性规律参数化方案有助于更精确地观测大气资源。
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| 关 键 词： | 青藏高原 碳水通量 湍流谱 归一化标准差相似性规律 大气稳定度 |
Study on the Characteristics of Atmospheric Turbulence Exchange in the Lower Reaches of the Lhasa River in the Eastern Qinghai-Xizang Plateau |
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| YANG Bin,YUAN Qi,TAN Changhai,ZHANG Gong,ZHENG Ning,GU Lianglei.Study on the Characteristics of Atmospheric Turbulence Exchange in the Lower Reaches of the Lhasa River in the Eastern Qinghai-Xizang Plateau[J].Plateau Meteorology,2022(1):204-215. |
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| Authors: | YANG Bin YUAN Qi TAN Changhai ZHANG Gong ZHENG Ning GU Lianglei |
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| Institution: | (Comprehensive Survey Command Center for Natural Resources,China Geological Survey,Beijing 100055,China;Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China;School of Atmospheric Sciences,SUN YAT-SEN University,Zhuhai 519082,Guangdong,China;Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;Nagqu Station of Plateau Climate and Environment,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China) |
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| Abstract: | Matter and energy between the land and atmosphere are transported with turbulent movement.Eddy covariance technology is an important way to evaluate atmospheric resources.It plays an important role in turbulence characteristics and accurate flux observation research.In this study,we analyzed the characteristics and similarity of turbulence spectra under different atmosphere conditions in the growing and non-growing seasons using closed-path eddy covariance system of Caigongtang flux station for the underlying surface of the typical grassland in the lower reaches of the Lhasa River in the eastern Qinghai-Xizang Plateau from August to November,2020.The results showed:(1)During the growing season from August to September,the average daily net ecosystem CO2 exchange(NEE)was -2.3 gC·m-2·d-1,and the average daily ET was 1.8 mm·day-1,During the non-growing season from October to November,the average daily NEE was 1.1 gC·m-2·d-1,and the average daily ET was 0.3 mm·day-1;(2)The normalized spectra of three-dimensional(u,v and w)direction of turbulent wind speed and temperature had obvious sub-regions of inertia,the slope of the spectra density curve conformed to the -2/3 law,and the normalized co-spectra of the vertical direction(w)turbulent wind speed and temperature,CO2 and H2O gas concentrations is higher than-4/3 law;(3)The daily variation of atmosphere stability during the growing and non-growing seasons was similar,mainly decreasing with the increase of momentum flux,but the normalized standard deviation(σ/u*)fitting results of wind speed in each direction were different.During the growing season,σu/u*,σv/u*,and σw/u* were 2.84,2.73,and 1.07,respectively.During the nongrowing season,the three increased to 3.23,3.19,and 1.22,respectively.The increase in normalized standard deviation of horizontal wind speed was obvious during the non-growing season,so the parameterization scheme of the similarity law of turbulent wind speed during the growing and non-growing seasons should be considered separately.The closed-path eddy covariance system can better realize the flux observation in this study area,and this conclusion can provide the basis for the land surface parameterization scheme that considers the similarity of the turbulent wind speed during the growing and non-growing seasons,which helps to observe the atmospheric resources more accurately. |
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| Keywords: | Qinghai-Xizang Plateau carbon and water flux turbulence spectra normalized standard deviation similarity law atmosphere stability |
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