European Space Agency (ESA) Global Snow Water Equivalent Monitoring, 1979-2013

The efforts of the European Space Agency (ESA) Data User Element (DUE) funded GlobSnow project has resulted in two new hemispherical records of snow parameters intended for climate research purposes. The dataset contains satellite-retrieved information on snow water equivalent (SWE) extending 34 years. The record on snow water equivalent is produced using a combination of passive microwave radiometer and ground-based weather station data, spanning years 1979 to 2013.
The GlobSnow SWE record, based on methodology by Pulliainen (Pulliainen 2006, Takala et al. 2011) utilizes a data-assimilation based approach combining space-borne passive radiometer data (SMMR, SSM/I and SSMIS) with data from ground-based synoptic weather stations. The satellite sensors utilized provide data at K- and Ka-bands (19 GigaHertz and 37 GigaHertz respectively) at a spatial resolution of approximately 25 kilometers (km). The SWE record is produced on a daily, weekly and monthly basis. SWE information is provided for terrestrial non-mountainous regions of Northern Hemisphere, excluding glaciers and Greenland.

欧洲空间局（European Space Agency, ESA）数据用户要素（Data User Element, DUE）资助的GlobSnow项目产出了两份全新的半球尺度积雪参数数据集，旨在服务于气候研究。该数据集包含时长34年的卫星反演积雪水当量（snow water equivalent, SWE）信息。其中的积雪水当量数据集结合了被动微波辐射计与地面气象站观测数据，时间跨度为1979年至2013年。
GlobSnow积雪水当量数据集基于Pulliainen等人的研究方法（Pulliainen 2006；Takala et al. 2011），采用数据同化方法将星载被动辐射计数据（SMMR、SSM/I及SSMIS）与地面天气站观测数据进行融合。所用卫星传感器分别在K波段与Ka波段（即19吉赫兹与37吉赫兹）获取数据，空间分辨率约为25千米。该积雪水当量数据集按日、周、月三种时间尺度生成，覆盖北半球不含冰川与格陵兰岛的非山地陆地区域。