Berlin 2014 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 11: Postersession
UP 11.5: Poster
Mittwoch, 19. März 2014, 17:00–18:30, MAG Poster
Long-Term Changes in Temperature and Radiation at the Arctic Station Ny-Ålesund (79°N, 12°E) — •Marion Maturilli1, Andreas Herber2, and Gert König-Langlo2 — 1Alfred-Wegener-Institut, Helmholtz Zentrum für Polar- und Meeresforschung, Potsdam — 2Alfred-Wegener-Institut, Helmholtz Zentrum für Polar- und Meeresforschung, Bremerhaven
At the Franco-German AWIPEV Arctic research base in Ny-Ålesund (79°N, 12°E), Svalbard, surface radiation measurements have been operated since 1992 in the frame of the Baseline Surface Radiation Network (BSRN). The data are complemented with surface meteorology measurements since 1993, contributing to the study of climate change in the Arctic with focus on alpine/marine landscape. Over the last 20 years, changes both in surface radiation and temperature have been observed in Ny-Ålesund. An increase of the annual mean temperature of +1.4 +/-0.8 K per decade indicates a substantial warming of the Ny-Ålesund environment, accompanied by an increase of the annual mean radiation budget of +4.9 +/-2.9 Wm-2 per decade. Separating the annual radiation budget to its different contributions it turns out that by far the largest changes are observed in the increasing long-wave radiation during the winter season. In fact, also the temperature increase is largest during the winter season, with +3.3 +/-2.6 K per decade. In the recent warmer winters, precipitation has often occurred in the form of rain rather than snow. Furthermore, changes in reflective solar radiation indicate an earlier onset of the snow melt by 1 week compared to 20 years ago.