The recent warming trend in North Greenland

TitleThe recent warming trend in North Greenland
Publication TypeJournal Article
Year of Publication2017
AuthorsOrsi A.J, Kawamura K, Masson-Delmotte V., Fettweis X., Box JE, Dahl-Jensen D., Clow G.D, Landais A., Severinghaus JP
JournalGeophysical Research Letters
Date Published2017/06
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000405854200042
Keywordsamplification; Arctic; core; Data assimilation; deep air convection; ice-sheet; polar ice; reanalysis project; regional climate model; sea-ice; transport

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 degrees W, 77 degrees 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 degrees C over the past 30 years, from the long-term 1900-1970 average of -28.55 +/- 0.29 degrees 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.

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