A daily, 0.05° Snow depth dataset for Tibetan Plateau (2000-2018)

Under the funding of the first project (Development of Multi-scale Observation and Data Products of Key Cryosphere Parameters) of the National Key Research and Development Program of China-"The Observation and Inversion of Key Parameters of Cryosphere and Polar Environmental Changes", the research group of Zhang, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, developed the snow depth downscaling product in the Qinghai-Tibet Plateau. The snow depth downscaling data set for the Tibetan Plateau is derived from the fusion of snow cover probability dataset and Long-term snow depth dataset in China. The sub-pixel spatio-temporal downscaling algorithm is developed to downscale the original 0.25° snow depth dataset, and the 0.05° daily snow depth product is obtained. By comparing the accuracy evaluation of the snow depth product before and after downscaling, it is found that the root mean square error of the snow depth downscaling product is 0.61 cm less than the original product. The details of the product information of the Downscaling of Snow Depth Dataset for the Tibetan Plateau (2000-2018) are as follows. The projection is longitude and latitude, the spatial resolution is 0.05° (about 5km), and the time is from September 1, 2000 to September 1, 2018. It is a TIF format file. The naming rule is SD_yyyyddd.tif, where yyyy represents year and DDD represents Julian day (001-365). Snow depth (SD), unit: centimeter (cm). The spatial resolution is 0.05°. The time resolution is day by day.

在国家重点研发计划“青藏高原关键参数多尺度观测和数据产品开发”第一项目（“青藏高原关键参数和极地环境变化观测与反演”）的资助下，中国科学院青藏高原研究所张课题组研发了青藏高原的雪深降尺度产品。该青藏高原雪深降尺度数据集通过融合雪覆盖概率数据集和中国长期雪深数据集而生成。为降低原始0.25°雪深数据集的分辨率，课题组开发了亚像素时空降尺度算法，从而获得了0.05°每日雪深产品。通过对比降尺度前后雪深产品的精度评估，发现降尺度后的雪深产品均方根误差比原始产品降低了0.61厘米。以下是青藏高原雪深降尺度数据集（2000-2018）的产品详细信息：投影坐标系为经纬度，空间分辨率为0.05°（约5公里），时间范围为2000年9月1日至2018年9月1日。数据格式为TIF文件。命名规则为SD_yyyyddd.tif，其中yyyy代表年份，DDD代表儒略日（001-365）。雪深（SD），单位：厘米，空间分辨率为0.05°，时间分辨率为每日。