VEMAP 1: U.S. SITE FILES

The Vegetation/Ecosystem Modeling and Analysis Project (VEMAP) is an ongoing multiinstitutional, international effort addressing the response of biogeography and biogeochemistry to environmental variability in climate and other drivers in both space and time domains. The objectives of VEMAP are the intercomparison of biogeochemistry models and vegetationtype distribution models (biogeography models) and determination of their sensitivity to changing climate, elevated atmospheric carbon dioxide concentrations, and other sources of altered forcing. Site files contain monthly climate and scenario data in column format. This time-sequential format was developed to facilitate the extraction of data for individual stations. README files included under the /siteFiles directory give instructions on how to find a particular grid cell. Site files omit background grid cells, with a new line for each grid cell (3261 data records). Each file lists 12 monthly values (January-December) as a single record. A record also contains geographic information about the associated grid point such as latitude, longitude, elevation, state identification number, and Kuchler and VEMAP vveg.v2 vegetation types. A complete users guide to the VEMAP Phase I database which includes more information about this data set can be found at ftp://daac.ornl.gov/data/vemap-1/comp/Phase_1_User_Guide.pdf. ORNL DAAC maintains additional information associated with the VEMAP Project. Data Citation: This data set should be cited as follows: Kittel, T. G. F., N. A. Rosenbloom, T. H. Painter, D. S. Schimel, H. H. Fisher, A. Grimsdell, VEMAP Participants, C. Daly, and E. R. Hunt, Jr. 2002. VEMAP Phase I Database, revised. Available on-line from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.植被/生态系统建模与分析项目（Vegetation/Ecosystem Modeling and Analysis Project，简称VEMAP）是一项持续推进的多机构国际性研究计划，旨在探究生物地理学与生物地球化学在气候及其他驱动因子的时空变化下的响应规律。 VEMAP的核心目标为：开展生物地球化学模型与植被类型分布模型（即生物地理学模型）的对比研究，并确定这些模型对气候变化、大气二氧化碳浓度升高及其他强迫因子改变的敏感性。 站点文件以列格式存储月度气候与情景数据。该时序数据格式的设计初衷是便于提取单个气象站点的数据。/siteFiles目录下附带的README文件提供了查找特定网格单元的操作指南。站点文件未包含背景网格单元，每个网格单元对应一行数据，总计3261条记录。每条记录包含12个月度数值（1月至12月），同时还附带关联网格点的地理信息，包括纬度、经度、海拔、州识别编号，以及库赫勒（Kuchler）植被类型与VEMAP vveg.v2植被类型。 如需获取该数据集的更多详细信息，可查阅VEMAP第一阶段数据库的完整用户指南，其下载链接为ftp://daac.ornl.gov/data/vemap-1/comp/Phase_1_User_Guide.pdf。美国橡树岭国家实验室分布式主动存档中心（ORNL DAAC）还维护着与VEMAP项目相关的其他补充信息。 数据引用规范：本数据集应按照以下格式进行引用： Kittel, T. G. F., N. A. Rosenbloom, T. H. Painter, D. S. Schimel, H. H. Fisher, A. Grimsdell, VEMAP项目参与者, C. Daly, 及E. R. Hunt Jr. 2002年. VEMAP第一阶段数据库（修订版）. 可从美国田纳西州橡树岭市橡树岭国家实验室分布式主动存档中心在线获取。