Surface radiation climatology for Ny-?lesund, Svalbard (78.9° N), basic observations for trend detection
摘要
At Ny-?lesund (78.9° N), Svalbard, surface radiation measurements of up- and downward short- and longwave radiation are operated since August 1992 in the frame of the Baseline Surface Radiation Network (BSRN), complemented with surface and upper air meteorology since August 1993. The long-term observations are the base for a climatological presentation of the surface radiation data. Over the 21-year observation period, ongoing changes in the Arctic climate system are reflected. Particularly, the observations indicate a strong seasonality of surface warming and related changes in different radiation parameters. The annual mean temperature at Ny-?lesund has risen by 1.3?±-.7?K per decade, with a maximum seasonal increase during the winter months of 3.1?±-.6?K per decade. At the same time, winter is also the season with the largest long-term changes in radiation, featuring an increase of 15.6?±-1.6?Wm? per decade in the downward longwave radiation. Furthermore, changes in the reflected solar radiation during the months of snow melt indicate an earlier onset of the warm season by about 1?week compared to the beginning of the observations. The supplementary dataset of Ny-?lesund surface radiation measurements (available at http://dx.doi.org/10.1594/PANGAEA.150000) provides a valuable data source for the validation of satellite instruments and climate models.