SMHIGridCim

SMHIGridClim, the Swedish Meteorological and Hydrological Institute Gridded Climatology, covers Fennoscandia at 2.5 km horizontal resolution for the period 1961–2018. It includes two-meter temperature and two-meter relative humidity at 1-, 3-, or 6-hour temporal resolution (which varies over the covered period), as well as daily minimum and maximum temperatures, daily precipitation, and daily snow depth. The gridding is performed using optimal interpolation with the open-source software gridpp from the Norwegian Meteorological Institute. Observations used in the analysis are provided by the Swedish, Finnish, and Norwegian meteorological institutes, as well as the European Centre for Medium-Range Weather Forecasts (ECMWF). Quality control of the observations is conducted using the open-source software TITAN, also developed at the Norwegian Meteorological Institute. The first guess for the optimal interpolation is obtained from the UERRA-HARMONIE reanalysis at 11 km horizontal resolution, which is statistically downscaled to fit a subset of the operational MEPS numerical prediction system at 2.5 km horizontal resolution, with daily and yearly variations in the downscaling parameters.

SMHIGridClim，即瑞典气象水文研究所格点气候数据集（Swedish Meteorological and Hydrological Institute Gridded Climatology），覆盖芬诺斯坎迪亚地区，水平分辨率为2.5公里，时间跨度为1961年至2018年。该数据集包含时间分辨率为1小时、3小时或6小时（在研究时段内存在变化）的2米气温与2米相对湿度数据，同时还涵盖日最低气温、日最高气温、日降水量以及日积雪深度。格点化处理采用挪威气象研究所开发的开源软件gridpp，通过最优插值方法完成。本分析所用的观测数据由瑞典、芬兰、挪威三国气象研究所以及欧洲中期天气预报中心（ECMWF）提供。观测数据的质量控制流程采用挪威气象研究所开发的开源软件TITAN执行。最优插值的初始背景场取自水平分辨率11公里的UERRA-HARMONIE再分析资料，该资料经统计降尺度处理以适配水平分辨率为2.5公里的业务化MEPS数值预报系统子集，且降尺度参数存在逐日与逐年的动态变化。