Details

Autor(en) / Beteiligte

• Bevis, Michael
• Harig, Christopher
• Khan, Shfaqat A.
• Brown, Abel
• Simons, Frederik J.
• Willis, Michael
• Fettweis, Xavier
• van den Broeke, Michiel R.
• Madsen, Finn Bo
• Kendrick, Eric
• Caccamise, Dana J.
• van Dam, Tonie
• Knudsen, Per
• Nylen, Thomas

Titel

Accelerating changes in ice mass within Greenland, and the ice sheet’s sensitivity to atmospheric forcing

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2019-02, Vol.116 (6), p.1934-1939

Ort / Verlag

United States: National Academy of Sciences

Erscheinungsjahr

2019

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• From early 2003 to mid-2013, the total mass of ice in Greenland declined at a progressively increasing rate. In mid-2013, an abrupt reversal occurred, and very little net ice loss occurred in the next 12–18 months. Gravity Recovery and Climate Experiment (GRACE) and global positioning system (GPS) observations reveal that the spatial patterns of the sustained acceleration and the abrupt deceleration in mass loss are similar. The strongest accelerations tracked the phase of the North Atlantic Oscillation (NAO). The negative phase of the NAO enhances summertime warming and insolation while reducing snowfall, especially in west Greenland, driving surface mass balance (SMB) more negative, as illustrated using the regional climate model MAR. The spatial pattern of accelerating mass changes reflects the geography of NAO-driven shifts in atmospheric forcing and the ice sheet’s sensitivity to that forcing. We infer that southwest Greenland will become a major future contributor to sea level rise.