Climate Normals for Last Glacial Maximum and Modern (1975-2005), Alaska

This dataset provides two 30-year climate normal data products for conditions during the last glacial maximum (LGM; ~18,000 years ago) and a modern time period (1975-2005) for the entire state of Alaska. The first set of products are monthly climate variable averages at 60 m resolution, including: minimum, maximum, and average temperatures, total precipitation, total surface radiation, rain, snow, potential evapotranspiration (PET), actual evapotranspiration (AET), and water deficit. The second set of products are annual summary climate variable averages for the same variables (excepting average temperature and rain) at 60m, 120m, 240m, 800m, 1km, 2km, 3km, 4km, 5km, 10km and 12km resolutions. The 30-year climate normal monthly averages were derived by topographically downscaling climate variables from existing coarse-resolution general circulation model outputs combined with local weather station data and digital surface models for Alaska for both the LGM and modern time periods at 60 m resolution. From this baseline, monthly averages for total surface radiation, rain, snow, potential evapotranspiration, actual evapotranspiration, and water deficit were also modeled. The annual averages are coarser resolution upsampled versions of the 60 m resolution monthly average data.

本数据集提供了阿拉斯加州在过去冰期极盛期（LGM，约18,000年前）和现代时期（1975-2005年）的两种30年气候常态数据产品。第一种产品为60米分辨率的月度气候变量平均值，包括：最低、最高和平均温度，总降水量，总地表辐射，雨、雪，潜在蒸散量（PET），实际蒸散量（AET）以及水资源短缺。第二种产品为上述变量的年度汇总气候变量平均值，分辨率为60米、120米、240米、800米、1公里、2公里、3公里、4公里、5公里、10公里和12公里，除平均温度和雨量外。30年气候常态月平均值的计算是通过从现有的粗分辨率一般环流模型输出中地形降尺度气候变量，并结合阿拉斯加当地的气象站数据和数字地表模型，在60米分辨率下对LGM和现代时期进行。在此基础上，还对总地表辐射、雨、雪、潜在蒸散量、实际蒸散量和水资源短缺的月平均进行了建模。年度平均值是60米分辨率月平均数据的粗分辨率上采样版本。