@misc{StoberHitzigerHeimetal., author = {Stober, Manfred and Hitziger, Thomas and Heim, Johanna and N{\"a}ke, Luisa and Hepperle, J{\"o}rg}, title = {Thirty years (1991 to 2021) ice elevation changes at Swiss Camp (West Greenland)}, series = {Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 - 05 May 2022, German Society for Polar Research}, journal = {Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 - 05 May 2022, German Society for Polar Research}, publisher = {Alfred-Wegener-Institut f{\"u}r Polar- und Meeresforschung}, address = {Bremerhaven}, issn = {1866-3192}, doi = {10.57738/BzPM_0762_2022}, pages = {S. 145}, abstract = {Since 1991 a long-term project exists for investigation of ice elevation change, ice flow velocity and deformation.at Swiss Camp (West Greenland, inland ice, 80 km from Ilulissat). The site was measured by the author with precise geodetic GNSS measurements on ground since 1991 until 2014 by 12 campaigns, and studied in relation to climatic indicators. In spring 2012 an expedition of the HEIM group traversed the Greenlandic inland ice from East to West. They conducted GNSS measurements along their entire route in order to continue the former measurements of KORTH 2002 and later by HITZIGER. Motivated by the author the HEIM expedition could also re-measure completely the research area at Swiss Camp in end of May 2021. Here we report about the results in context of former campaigns. The 2021 GNSS measurements were performed by a Trimble R12 receiver mounted on a sledge which was transported over the snow surface to the old stake positions. Together with kinematical measurements of all path ways the current heights were used to determine the elevation changes by digital elevation models and 48 single point comparisons. Together with the old results from 1991 to 2014 by the author the current elevation changes now result in a unique long-term 30-year time series of elevation changes from precise geodetic ground measurements on the Greenlandic ice sheet. During the overall observation period from 1991 to 2021 the ice height decreased by 19.3 meter. The new results show that in the period from 2014 to 2015 until 2021 the ice height is still distinctly decreasing, but less than 2006 to 2014. The peak was reached in 2011-2014 with 1,4 m/year. Since 2014 to 2021 the decrease in height was 0.9 m/year on average. These results are discussed together with climatic indicators. Air temperature and pdd-values correlate well with these elevation changes and show lower melting rates in this period. This is agreeing with mass balance results from satellite observations (GRACE resp. GRACE-FO). So the locally derived height changes from geodetic ground measurements confirm the large-scale satellite results.}, language = {en} }