Annual Snow Timing Index Rasters for the Western US and Alaska, WY2001-2019

Here, a collection of rasters describing annual snow onset (SO), snow cover duration (SCD), and day of snow disappearance (DSD) for WY2001-2019 over Alaska, Canada, and the Western United States (boundary box: -152W, -100W, 32N, 68N) are available. Units are in calendar Day of Year (DOY) for SO and DSD, and in days for SCD. These data accompany a manuscript entitled, "Investigating the Relationship Between Peak Snow-Water Equivalent and Snow Timing Indices in the Western U.S. and Alaska". A diagnostic model of peak SWE as a function of remotely sensed snow timing indices (the dataset provided here) was developed in the course of this study to address the following questions: 1) Are peak SWE and snow timing related?; 2) How does this relationship vary across the western United States?; and 3) What meteorological and topographical conditions affect this relationship?本数据集包含一组栅格数据（raster），涵盖阿拉斯加、加拿大以及美国西部2001至2019水文年（WY）的年度积雪起始日（snow onset, SO）、积雪持续时长（snow cover duration, SCD）与积雪消失日（day of snow disappearance, DSD）信息，研究区域边界框为西经152°、西经100°、北纬32°、北纬68°。其中积雪起始日与积雪消失日的单位为年积日（Day of Year, DOY），积雪持续时长的单位为天。 该数据集配套于题为"Investigating the Relationship Between Peak Snow-Water Equivalent and Snow Timing Indices in the Western U.S. and Alaska"的学术论文。本研究在开展过程中，基于本次提供的遥感积雪时序指标数据集，构建了以遥感积雪时序指标为自变量的峰值雪水当量（peak Snow-Water Equivalent, peak SWE）诊断模型，旨在解答以下三个研究问题：1. 峰值雪水当量与积雪时序是否存在关联？2. 该关联在美国西部不同区域呈现何种差异？3. 哪些气象与地形条件会对该关联产生影响？