青藏高原0.05°逐日积雪深度数据集（2000-2021）

在国家重点研发计划“冰冻圈和极地环境变化关键参数观测与反演”第一课题“冰冻圈关键参数多尺度观测与数据产品研制“的资助下，中国科学院青藏高原研究所张寅生课题组发展了青藏高原地区降尺度雪深产品。青藏高原积雪深度降尺度数据集来源于积雪概率数据和中国雪深长时间序列数据集的融合结果,采用新发展的亚像元时空分解算法对原始0.25度的积雪深度数据进行时空降尺度，得到0.05度逐日积雪深度产品。通过降尺度前后的雪深产品精度评估的对比，发现降尺度后雪深产品的均方根误差由原产品的2.15 cm减少到了1.54 cm。
青藏高原积雪深度降尺度数据集（2000-2021）的产品信息细节如下。投影为经纬度，空间分辨率0.05 度（约5公里），时间范围为2000年9月1日-2021年12月31日，为Tif格式文件，命名规则为：SD_YYYYDDD.tif，其中YYYY代表年，ddd代表儒略日（001-365）。积雪深度（SD），单位：厘米（cm）。空间分辨率为0.05度。时间分辨率为逐日。

Funded by the first sub-project "Multi-scale Observation of Cryospheric Key Parameters and Development of Data Products" under the National Key R&D Program "Observation and Inversion of Key Parameters of Cryospheric and Polar Environmental Changes", the research group led by Zhang Yinsheng from the Institute of Tibetan Plateau Research, Chinese Academy of Sciences, developed a downscaled snow depth product over the Tibetan Plateau. The Tibetan Plateau snow depth downscaled dataset is derived from the fusion result of snow cover probability data and China's long-term time-series snow depth dataset. A newly developed sub-pixel spatiotemporal decomposition algorithm was adopted to conduct spatiotemporal downscaling on the original 0.25° snow depth data, resulting in a daily snow depth product with a spatial resolution of 0.05°. Through comparative accuracy assessment of snow depth products before and after downscaling, it was found that the root mean square error (RMSE) of the snow depth product decreased from 2.15 cm of the original product to 1.54 cm. The product details of the Tibetan Plateau snow depth downscaled dataset (2000–2021) are as follows: The projection is latitude and longitude, with a spatial resolution of 0.05° (approximately 5 km). The temporal range spans from September 1, 2000 to December 31, 2021. The files are in TIF format, and the naming rule is: SD_YYYYDDD.tif, where YYYY represents the year, and ddd represents the Julian day (001–365). The parameter is snow depth (SD), with the unit of centimeter (cm). The spatial resolution is 0.05°, and the temporal resolution is daily.

搜集汇总

背景与挑战

背景概述

该数据集是青藏高原地区2000年至2021年的逐日积雪深度数据，空间分辨率约为5公里（0.05度），通过降尺度算法融合多源数据开发，显著提高了精度（均方根误差从2.15 cm降至1.54 cm）。数据以Tif格式提供，适用于冰冻圈和遥感研究，需申请获取并按规定引用。