Numerical Terradynamic Simulation Group 11-2001 FLUXNET : A New Tool to Study the Temporal and Spatial Variability of Ecosystem-Scale Carbon Dioxide , Water Vapor , and Energy Flux Densities-猫眼课题宝

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2017

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D. Baldocchi;E. Falge;L. Gu;R. Olson;D. Hollinger;S. Running;P. Anthoni;C. Bernhofer;K. Davis-K.-Da

FLUXNET是一个全球微气象通量测量站点网络，用于测量生物圈和大气之间的二氧化碳、水蒸气和能量交换。目前，有140多个地点长期持续运作。研究的植被包括温带针叶林和阔叶林（落叶和万年青）、热带和北方森林、作物、草地、查帕拉尔、湿地和苔原。分布于5个大陆上，纬度分布范围为70°N ~ 30°S。FLUXNET有几个主要功能。首先，它为科学界提供了汇编、存档和分发碳、水和能量通量测量以及气象、植物和土壤数据的基础设施。(Data和站点信息可在FLUXNET网站http：//www-eosdis.oml.gov/FLUXNET/上在线获得。第二，该项目支持校准和通量相互比较活动。这项活动确保了区域网络的数据具有可比性。第三，FLUXNET通过支持项目科学家、研讨会和访问科学家来支持想法和数据的综合、讨论和交流。总体目标是提供信息，以验证安装在NASA Terra卫星上的传感器产生的净初级生产力，蒸发和能量吸收的计算。FLUXNET正在汇编的数据被用于量化和比较年度生态系统碳和水平衡的幅度和动态，量化林分尺度二氧化碳和水蒸气通量密度对控制生物和非生物因素的响应，并验证土壤-植物-大气痕量气体交换模型的层次结构。目前的研究结果包括：1）生长季节每延长一天，温带阔叶林的CO2净交换量增加约5.7gC·m ~（-1）·d ~（-1）; 2）如果天空多云而不是晴朗，生态系统CO2净交换量对阳光的敏感性增加一倍;（3）CO2通量密度谱在日、周、年时间尺度上有峰值，在月时间尺度上有谱隙;（4）CO2净交换的最适温度随夏季平均气温而变化，（5）林龄影响CO2和水汽通量密度。^ESPM，University o f加州，伯克利，伯克利，加州. *^Pflanzenokologie，Universitat拜罗伊特，拜罗伊特，德国.橡树岭国家实验室环境科学部

FLUXNET is a global network of micrometeorological flux measurement sites that measure the exchanges of car bon dioxide, water vapor, and energy between the biosphere and atmosphere. At present over 140 sites are operating on a long-term and continuous basis. Vegetation under study includes temperate conifer and broadleaved (deciduous and evergreen) forests, tropical and boreal forests, crops, grasslands, chaparral, wetlands, and tundra. Sites exist on five con tinents and their latitudinal distribution ranges from 70°N to 30°S. FLUXNET has several primary functions. First, it provides infrastructure for compiling, archiving, and distributing carbon, water, and energy flux measurement, and meteorological, plant, and soil data to the science community. (Data and site information are available online at the FLUXNET Web site, http://www-eosdis.oml.gov/FLUXNET/.) Second, the project supports calibration and flux intercomparison activities. This activity ensures that data from the regional networks are intercomparable. And third, FLUXNET supports the synthesis, discussion, and communication of ideas and data by supporting project scientists, workshops, and visiting scientists. The overarching goal is to provide infor mation for validating computations of net primary productivity, evaporation, and energy absorption that are being generated by sensors mounted on the NASA Terra satellite. Data being compiled by FLUXNET are being used to quantify and compare magnitudes and dynamics of annual ecosystem carbon and water balances, to quantify the response of stand-scale carbon dioxide and water vapor flux densities to controlling biotic and abiotic factors, and to validate a hierarchy of soil-plant-atmosphere trace gas ex change models. Findings so far include 1) net CO ̂ exchange of temperate broadleaved forests increases by about 5.7 g C m“̂ day^ for each additional day that the growing season is extended; 2) the sensitivity of net ecosystem CO ̂ exchange to sunlight doubles if the sky is cloudy rather than clear; 3) the spectrum of CO ̂flux density exhibits peaks at timescales of days, weeks, and years, and a spectral gap exists at the month timescale; 4) the optimal temperature of net CO ̂exchange varies with mean summer temperature; and 5) stand age affects carbon dioxide and water vapor flux densities. ^ESPM, University o f California, Berkeley, Berkeley, California. *^Pflanzenokologie, Universitat Bayreuth, Bayreuth, Germany. Environm ental Science Division, Oak Ridge National Laboratory, Oak

Numerical Terradynamic Simulation Group 11-2001 FLUXNET : A New Tool to Study the Temporal and Spatial Variability of Ecosystem-Scale Carbon Dioxide , Water Vapor , and Energy Flux Densities

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