中国长时间序列地表冻融状态数据集

Long-term Land Surface Freeze/thaw Status Datasets of China

地表冻结和融化状态的转换表征着陆地表层过程的休眠和活跃,亦可作为水文循环和生态系统活动的＂开关＂。本文主要介绍根据双指标冻融状态分类算法和决策树算法制备的中国区域长时间序列地表冻融数据集（分别为1978～2015年与1987～2009年）,该数据集可用于分析中国区域地表冻融循环的开始/结束日期、冻结期、冻结天数、冻结范围等指标的时空分布和变化趋势,可为中国区域的冰冻圈和水文相关研究,以及气候变化分析提供重要的数据支持。

The transitions of land surface freeze/thaw status indicate the dormancy and activeness of land surface processes,like a switch controlling hydrological cycle and ecosystem activity.This paper introduced two datasets of long-term land surface soil freeze/thaw states of China based on dual-indices algorithm and decision tree algorithm Covering the period from 1978 to 2015and from 1987～2009respectively.Both datasets can be used to derive the distribution and trend of onset of surface freeze/thaw status,frozen period,the number of frozen days and frozen extent over China,the information is useful to support cryosphere and hydrology related research,and climate change analysis.Both datasets can be accessed forfree in Environmental and Ecological Science Data in West China（http：//westdc.westgis.ac.cn）.