Modeling polar bear (Ursus maritimus) snowdrift den habitat on Alaska’s Beaufort Sea coast using SnowDens-3D and ArcticDEM data

Pregnant polar bears (Ursus maritimus) excavate maternal dens in seasonal snowdrifts during fall along Alaska’s Beaufort Sea coast to shelter their altricial young during birth and development. With recent sea ice decreases, bears are denning more frequently on land. Each year, the weather and blowing-snow conditions control the creation of snowdrifts across the landscape, and the available snowdrift den habitat can vary widely from one year to the next, depending on the late fall and early winter air temperature, snowfall, and wind speed and direction. We implemented a physics-based, spatiotemporal, polar bear snowdrift den habitat model (SnowDens-3D) across the eastern Alaska Beaufort Sea coast (an area of approximately 17,000 km^2^). High-resolution (2.0 m) topography data were provided by the ArcticDEM, and daily meteorological forcings were provided by NASA’s MERRA-2 reanalysis. A 21-year (2000–2020) SnowDens-3D simulation was performed, and model outputs were compared with 91 hist..., , , # Modeling polar bear (*Ursus maritimus*) snowdrift den habitat on Alaska’s Beaufort Sea coast using SnowDens-3D and ArcticDEM data ## Dataset Authors, Title, and DOI Link Authors = Katherine Gura, Colorado State University, [[e-mail]](mailto:[e-mail]) Glen E. Liston, Colorado State University, [[e-mail]](mailto:[e-mail]) Dataset Title and DOI Link = Modeling polar bear (*Ursus maritimus*) snowdrift den habitat on Alaska’s Beaufort Sea coast using SnowDens-3D and ArcticDEM data, data archive. [Dataset]. Dryad. [https://doi.org/10.5061/dryad.34tmpg4t4](https://doi.org/10.5061/dryad.34tmpg4t4) ## Data file Archive Data File Name = AK_PBDH_SD3D_Data_Archive.zip This AK_PBDH_SD3D_Data_Archive.zip file includes the files described in the README_Data_for_Alaska_SnowDens-3D_and_ArcticDEM_Modeling.md (and .pdf) file. ## Description of the data and data files ### 1) GeoTIFF/AK\_PBDH\_SD3D\_20m\_\*\*\*\*.tif (22 fil...怀孕的北极熊（*Ursus maritimus*）会于秋季在阿拉斯加波弗特海沿岸的季节性雪堆中挖掘产房巢穴，以便在幼崽出生与成长阶段为其晚熟后代提供庇护。近年来随着海冰减少，北极熊在陆地筑巢的频率显著上升。每年，区域内雪堆的形成由天气与吹雪条件共同决定，而可被用作巢穴的雪堆生境每年差异巨大，这取决于晚秋和初冬的气温、降雪量以及风速与风向。我们基于物理原理构建了时空维度的北极熊雪堆巢穴生境模型（SnowDens-3D），并将其应用于阿拉斯加波弗特海东部沿岸约17000平方千米的区域。该研究使用的2.0米分辨率高分辨率地形数据来自ArcticDEM，每日气象强迫场数据则由美国国家航空航天局（NASA）的MERRA-2再分析数据集提供。我们开展了2000年至2020年共计21年的SnowDens-3D模拟，并将模型输出结果与91项历史数据进行了对比。 # 基于SnowDens-3D与ArcticDEM数据模拟阿拉斯加波弗特海沿岸北极熊雪堆巢穴生境 ## 数据集作者、标题与DOI链接 作者： 凯瑟琳·古拉（Katherine Gura），科罗拉多州立大学，[[e-mail]](mailto:[e-mail]) 格伦·E·利斯顿（Glen E. Liston），科罗拉多州立大学，[[e-mail]](mailto:[e-mail]) 数据集标题与DOI链接： 《基于SnowDens-3D与ArcticDEM数据模拟阿拉斯加波弗特海沿岸北极熊雪堆巢穴生境》，数据存档。[数据集]. Dryad. [https://doi.org/10.5061/dryad.34tmpg4t4](https://doi.org/10.5061/dryad.34tmpg4t4) ## 数据文件 存档数据文件名：AK_PBDH_SD3D_Data_Archive.zip 该AK_PBDH_SD3D_Data_Archive.zip压缩包包含README_Data_for_Alaska_SnowDens-3D_and_ArcticDEM_Modeling.md（及.pdf）文件中描述的全部数据文件。 ## 数据与数据文件说明 ### 1) GeoTIFF格式文件：AK_PBDH_SD3D_20m_***.tif（共22个……）