HySN Data set

HySN, a high resolution HYbrid SeNorge data set of daily near surface humidity and incident shortwave and longwave radiation, and surface pressure created by merging reanalysis data (Era-interim) with a national 1-by-1 km gridded temperature data set, SeNorgev2 (SeNorge v2.1 between 1979 and 2015, and SeNorge v2.0 from 2016). The assumptions and methods used to downscale humidity and longwave radiation are similar to those used in WATCH/PGMFD/NLDAS-1. The software used to compile the data is available at GitHub. The data is described, and compared to surface observations and other data sets here: Erlandsen, H. B., Tallaksen, L. M., and Kristiansen, J.: Merits of novel high-resolution estimates and existing long-term estimates of humidity and incident radiation in a complex domain, Earth Syst. Sci. Data, 11, 797-821, https://doi.org/10.5194/essd-11-797-2019, 2019, and in its supplement: Supplement of Earth Syst. Sci. Data, 11, 797–821, 2019 https://doi.org/10.5194/essd-11-797-2019-supplement . The data has the same projection as SeNorge, UTM33, and is stored for precipitation days, i.e. the datestamp is day-month-year 06 UTC and the variable represents average value of the preceding 24 hours. Monthly means of the data can be found here: https://doi.org/10.5281/zenodo.1993870 . Note that HySN5, a high resolution HYbrid SeNorge data set of daily near surface humidity and surface incident shortwave and longwave radiation, and surface pressure created by merging reanalysis data (Era5) with a national 1-by-1 km gridded temperature data set, SeNorge2018, is available from 1979-2000 (10.5281/zenodo.3351430) and 2001-2017 (10.5281/zenodo.3516560).