Future winter precipitation (CONUS) (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 contiguous United States are ensemble mean values across 20 global climate models from the CMIP5 experiment (https://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-11-00094.1), downscaled to a 4 km grid. For more information on the downscaling method and to access the data, please see Abatzoglou and Brown, 2012 (https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/joc.2312) and the Northwest Knowledge Network (https://climate.northwestknowledge.net/MACA/). We used the MACAv2- Metdata monthly dataset; monthly precipitation values (mm) were summed over the season of interest (annual, winter, or summer). Absolute and percent change were then calculated between the historical and future time periods.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研究站（RMRS）与可持续性及气候变化办公室联合开发，旨在满足国家森林管理者对决策过程中所需的相关气候变化的预测信息的需求，包括森林规划。这些地图采用了最前沿的科学技术，并为美国所有连续森林提供了相应的数据覆盖。目前，地图集包含了与降水、气温、积雪（包括积雪停留时间和4月1日的积雪水当量）以及溪流流量相关的变量。美国连续地区的历史（1975-2005）和未来（2071-2090）降水和气温数据是CMIP5实验中20个全球气候模型的集合平均值（https://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-11-00094.1），并下采样到4公里网格。有关下采样方法和访问数据的更多信息，请参阅Abatzoglou和Brown，2012（https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/joc.2312）以及西北知识网络（https://climate.northwestknowledge.net/MACA/）。我们使用了MACAv2-气象月度数据集；将季节内（年度、冬季或夏季）的月降水值（毫米）相加。然后计算历史时期和未来时期之间的绝对变化和百分比变化。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）。本记录来自向https://data.gov目录提供数据的美国农业部企业数据目录。本记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS GeoService。欲获取完整信息，请访问https://data.gov。