Percent change in winter precipitation (Alaska) (Image Service)

The National Forest Climate Change Maps project was developed by the Rocky Mountain Research Station (RMRS) and the Office of Sustainability and Climate to meet the needs of national forest managers for information on projected climate changes at a scale relevant to decision making processes, including forest plans. The maps use state-of-the-art science and are available for every national forest in the contiguous United States with relevant data coverage. Currently, the map sets include variables related to precipitation, air temperature, snow (including snow residence time and April 1 snow water equivalent), and stream flow.Historical (1975-2005) and future (2071-2090) precipitation and temperature data for the state of Alaska were developed by the Scenarios Network for Alaska and Arctic Planning (SNAP) (https://snap.uaf.edu). Monthly precipitation values (mm) were summed over the season of interest (annual, winter, or summer). These datasets have several important differences from the MACAv2-Metdata (https://climate.northwestknowledge.net/MACA/) products, used in the contiguous U.S. They were developed using different global circulation models and different downscaling methods, and were downscaled to a different scale (771 m instead of 4 km). While these cover the same time periods and use broadly similar approaches, caution should be used when directly comparing values between Alaska and the contiguous United States.Raster data are also available for download from RMRS site (https://www.fs.usda.gov/rm/boise/AWAE/projects/NFS-regional-climate-change-maps/categories/us-raster-layers.html), along with pdf maps and detailed metadata (https://www.fs.usda.gov/rm/boise/AWAE/projects/NFS-regional-climate-change-maps/downloads/NationalForestClimateChangeMapsMetadata.pdf).This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService For complete information, please visit https://data.gov.

国家森林气候变化地图项目由落基山脉研究站（RMRS）和可持续发展与气候变化办公室共同开发，旨在满足国家森林管理者对决策过程中相关气候变化信息的需求，包括森林规划。这些地图采用了尖端科学技术，且覆盖了美国所有连续森林区域的相关数据。目前，地图集包括与降水、空气温度、积雪（包括积雪停留时间和4月1日的积雪水当量）以及河流流量相关的变量。阿拉斯加州的历史（1975-2005）和未来（2071-2090）降水和温度数据由阿拉斯加和北极规划情景网络（SNAP）开发（https://snap.uaf.edu）。月度降水值（毫米）在感兴趣的季度（年度、冬季或夏季）内进行了汇总。与在美国连续地区使用的MACAv2-Metdata（https://climate.northwestknowledge.net/MACA/）产品相比，这些数据集存在几个重要差异。它们是利用不同的全球环流模型和不同的降尺度方法开发的，并且降尺度到了不同的尺度（771米而不是4公里）。尽管它们覆盖了相同的时间段，并采用了广泛相似的方法，但在直接比较阿拉斯加和美国的数值时仍需谨慎。栅格数据也可从RMRS网站（https://www.fs.usda.gov/rm/boise/AWAE/projects/NFS-regional-climate-change-maps/categories/us-raster-layers.html）下载，同时提供PDF地图和详细的元数据（https://www.fs.usda.gov/rm/boise/AWAE/projects/NFS-regional-climate-change-maps/downloads/NationalForestClimateChangeMapsMetadata.pdf）。本记录摘自向https://data.gov目录提供数据的美国农业部企业数据清单。本记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS地理服务。如需完整信息，请访问https://data.gov。