The recent warming trend in North Greenland

• Published in: Geophysical Research Letters
• Main Authors: Orsi, Anais, Kawamura, Kenji, Masson-Delmotte, Valerie, Fettweis, Xavier, Box, Jason, Dahl-Jensen, Dorthe, Clow, Gary, LANDAIS, AMAELLE, Severinghaus, Jeffrey
• Other Authors: Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Scripps Institution of Oceanography (SIO), University of California San Diego (UC San Diego), University of California-University of California, National Institute of Polar Research Tokyo (NiPR), Département de Géographie (UCL GEO), Université Catholique de Louvain = Catholic University of Louvain (UCL), Geological Survey of Denmark and Greenland (GEUS), Niels Bohr Institute Copenhagen (NBI), Faculty of Science Copenhagen, University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU), Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: The Arctic: An AGU Joint Special Collection; Supporting Information S1; Data Set S1; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; Arctic; Greenland; North Greenland
• Online Access: https://hal.archives-ouvertes.fr/hal-03103991; https://hal.archives-ouvertes.fr/hal-03103991/document; https://hal.archives-ouvertes.fr/hal-03103991/file/2016GL072212.pdf; https://doi.org/10.1002/2016GL072212

International audience The Arctic is among the fastest warming regions on Earth, but it is also one with limited spatial coverage of multidecadal instrumental surface air temperature measurements. Consequently, atmospheric reanalyses are relatively unconstrained in this region, resulting in a large spread of estimated 30 year recent warming trends, which limits their use to investigate the mechanisms responsible for this trend. Here we present a surface temperature reconstruction over 1982-2011 at NEEM (North Greenland Eemian Ice Drilling Project, 51 ∘ W, 77 ∘ N), in North Greenland, based on the inversion of borehole temperature and inert gas isotope data. We find that NEEM has warmed by 2.7 ± 0.33 ∘ C over the past 30 years, from the long-term 1900-1970 average of −28.55 ± 0.29 ∘ C. The warming trend is principally caused by an increase in downward longwave heat flux. Atmospheric reanalyses underestimate this trend by 17%, underlining the need for more in situ observations to validate reanalyses.