Home Page for the Circumpolar Active Layer Monitoring (CALM) program, 1990-2002

This dataset consists of the Home Page for the Circumpolar Active Layer Monitoring (CALM) program as well as multiple directories and files of jpg and gif images, docs, html files, powerpoint, xls and txt files. The data are from a CD and are contained in a single gzipped tar file. The CALM program is designed to monitor and model changes in the thickness of the active layer above permafrost. CALM consists of 81 research sites operated by researchers from Austria, Canada, China, Denmark/Greenland, Kazakstan, Poland/Svalbard, Russia, Sweden/Svalbard, Switzerland and the United States. Investigators at these sites measure the seasonal thaw depth across plots using a standard protocol. Soil and air temperature, and soil moisture content, are also measured at many sites using a standard format. The soil, landscape, and vegetation at each site is also described.

本数据集包含环极活动层监测（Circumpolar Active Layer Monitoring，CALM）计划的主页，以及多个目录与文件——涵盖jpg和gif图像、文档（docs）、html文件、PowerPoint演示文稿、xls表格及txt文本文件。数据来源于一张CD，封装于单个gzip压缩的tar文件中。CALM计划旨在监测并模拟多年冻土上方活动层厚度的变化，由来自奥地利、加拿大、中国、丹麦/格陵兰、哈萨克斯坦、波兰/斯瓦尔巴群岛、俄罗斯、瑞典/斯瓦尔巴群岛、瑞士及美国的研究人员运营，共设81个研究站点。各站点研究人员采用标准协议在样地内测量季节性融化深度；此外，多个站点还通过标准格式记录土壤温度、空气温度及土壤含水量。每个站点的土壤、景观与植被特征亦有详细描述。