Percent change in summer 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.\n\nHistorical (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.\n\nRaster 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).\n\nThis 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）和可持续发展与气候变化办公室共同研发，旨在满足国家森林管理者对决策过程中相关气候变化的预测信息的需要，包括森林规划。该地图集运用了最先进的科学技术，涵盖了美国大陆所有国家森林的相关数据覆盖范围。目前，地图集包含与降水量、空气温度、降雪（包括降雪停留时间和4月1日的积雪水当量）以及河流流量相关的变量。

美国大陆历史上的（1975-2005）和未来的（2071-2090）降水量和温度数据是CMIP5实验中20个全球气候模型的综合平均值，并已缩小到4公里网格。关于降尺度方法的更多信息以及访问数据，请参阅Abatzoglou和Brown，2012年发表的文章（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- Metadata月度数据集；将季节相关的月降水量（毫米）进行汇总。接着计算了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）。

本记录来源于美国农业部企业数据目录，该目录输入至https://data.gov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。获取完整信息，请访问https://data.gov。