NorWeST modeled summer stream temperature scenarios for the western U.S.

NorWeST summer stream temperature scenarios were developed for all rivers and streams in the western U.S. from the > 20,000 stream sites in the NorWeST database where mean August stream temperatures were recorded. The scenarios include: 1) Adobe PDF format maps depicting historical and future modeled mean August stream temperatures, 2) graphs (JPG format) demonstrating the accuracy of the temperature model, and 3) GIS shapefiles (SHP format) representing the spatially modeled stream temperatures. The GIS shapefiles include stream lines and associated mid-points representing 1 kilometer intervals along the stream network. Stream lines were derived from the 1:100,000 scale NHDPlus dataset (USEPA and USGS 2010; McKay et al. 2012). Shapefile extents correspond to NorWeST processing units, which generally relate to 6 digit (3rd code) hydrologic unit codes (HUCs) or in some instances closely correspond to state borders. The line and point shapefiles contain identical modeled stream temperature results. The two shapefile formats are meant to complement one another for use in different applications. In addition, spatial and temporal covariates used to generate the modeled temperatures are included in the shapefile attribute tables. The NorWeST NHDPlusV1 processing units include: Salmon, Clearwater, Spokoot, Missouri Headwaters, Snake-Bear, MidSnake, MidColumbia, Oregon Coast, South-Central Oregon, Upper Columbia-Yakima, Washington Coast, Upper Yellowstone-Bighorn, Upper Missouri-Marias, and Upper Green-North Platte. The NorWeST NHDPlusV2 processing units include: Lahontan Basin, Northern California-Coastal Klamath, Utah, Coastal California, Central California, Colorado, New Mexico, Arizona, and Black Hills.These data were originally intended to be used for managing biological resources and predicting species distributions affected by August mean stream temperature.For more information on the NorWeST stream temperature project see: https://www.fs.usda.gov/rm/boise/AWAE/projects/NorWeST.html This data publication originally became available via the FS Research Data Archive on 11/17/2016. On 7/27/2022 the metadata was updated to correct old URLs.

NorWeST夏季溪流温度情景面向美国西部所有河流与溪流构建，数据源自NorWeST数据库中记录了8月平均溪流温度的20000余个溪流监测站点。该情景包含以下三类内容：1）Adobe PDF格式的地图，展示历史及未来模拟得到的8月平均溪流温度；2）JPG格式的图表，用于验证温度模型的拟合精度；3）地理信息系统（Geographic Information System, GIS）形状文件（shapefiles，SHP格式），承载空间模拟的溪流温度数据。
其中，GIS形状文件包含溪流线以及沿溪流网络以1千米为间隔的关联中点。溪流线源自1:10万比例尺的NHDPlus数据集（美国环境保护署（United States Environmental Protection Agency, USEPA）与美国地质调查局（United States Geological Survey, USGS），2010；McKay等，2012）。形状文件的覆盖范围对应NorWeST处理单元，这类单元通常对应6位（第三位编码）水文单元代码（Hydrologic Unit Codes, HUCs），部分场景下也与州界高度吻合。线与点形状文件包含完全一致的模拟溪流温度结果，两种形状文件格式旨在互为补充，适配不同应用场景。此外，用于生成模拟温度的空间与时间协变量已纳入形状文件的属性表中。
NorWeST NHDPlusV1处理单元包括：萨蒙、克利尔沃特、斯波库特、密苏里河源头、斯内克-贝尔、中斯内克、中哥伦比亚、俄勒冈海岸、俄勒冈中南部、上哥伦比亚-亚基马、华盛顿海岸、上黄石-大角、上密苏里-马里亚斯以及上格林-北普拉特。
NorWeST NHDPlusV2处理单元包括：拉洪坦盆地、北加州-海岸克拉马斯、犹他、加州海岸、加州中部、科罗拉多、新墨西哥、亚利桑那以及布莱克希尔斯。
本数据集最初旨在用于生物资源管理以及预测受8月平均溪流温度影响的物种分布。如需了解NorWeST溪流温度项目的更多信息，请访问：https://www.fs.usda.gov/rm/boise/AWAE/projects/NorWeST.html。本数据集于2016年11月17日首次通过美国林务局研究数据档案馆发布，2022年7月27日对元数据进行了更新以修正旧版URL。