Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 4.713
IF4.713
IF 5-year value: 4.927
IF 5-year
4.927
CiteScore value: 8.0
CiteScore
8.0
SNIP value: 1.425
SNIP1.425
IPP value: 4.65
IPP4.65
SJR value: 2.353
SJR2.353
Scimago H <br class='widget-line-break'>index value: 71
Scimago H
index
71
h5-index value: 53
h5-index53
Download
Short summary
We have reconstructed accumulation in 6 firn cores and 8 snow cores in Northern Greenland and compared with a regional Climate model over Greenland. We find the model underestimate precipitation especially in north-eastern part of the ice cap- an important finding if aiming to reconstruct surface mass balance. Temperatures at 10 meters depth at 6 sites in Greenland were also determined and show a significant warming since the 1990's of 0.9 to 2.5 °C.
Preprints
https://doi.org/10.5194/tc-2020-337
https://doi.org/10.5194/tc-2020-337

  11 Jan 2021

11 Jan 2021

Review status: this preprint is currently under review for the journal TC.

Recent North Greenland temperature warming and accumulation

Helle Astrid Kjær1, Patrick Zens1, Ross Edwards3, Martin Olesen4, Ruth Mottram4, Gabriel Lewis5, Christian Terkelsen Holme1, Samuel Black1,2, Kasper Holst Lund1, Mikkel Schmidt1, Dorthe Dahl-Jensen1,9, Bo Vinther1, Anders Svensson1, Nanna Karlsson7, Jason E. Box7, Sepp Kipfstuhl6, and Paul Vallelonga1,8 Helle Astrid Kjær et al.
  • 1Physics for Ice, Climate and Earth Sciences (PICE), Niels Bohr Institute, University of Copenhagen, Copenhagen 2100, Denmark
  • 2NatureScot, Inverness, IV3 8NW, United Kingdom
  • 3Physics and Astronomy, Curtin University, Perth, Western Australia, Australia
  • 4Danish Meteorological Institute, Copenhagen 2100, Denmark
  • 5Department of Earth Sciences, Dartmouth College, Hanover, NH, USA
  • 6Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
  • 7Geologic Survey of Denmark and Greenland (GEUS), Copenhagen 1350, Denmark
  • 8UWA Oceans Institute, University of Western Australia, Crawley, WA, Australia
  • 9University of Manitoba, Winnipeg, MB R3T 2N2, Canada

Abstract. In a warming climate concise knowledge of the mass balance of the Greenland ice sheet is of utter importance. Speculations that current warming will increase the snow accumulation and mitigate mass balance losses are unconstrained as accumulation data across large regions of the northern ice sheet are scarce. We reconstructed the accumulation from six north Greenland shallow firn cores (~10 m) and eight snow cores (~2 m) to constrain recent accumulation patterns in northern Greenland and calculated recent warming in the same area using borehole temperature measurements.

We find an increase in temperatures in the north Greenland interior of 0.9 to 2.5 °C (method and site dependent) per decade over the past two decades in line with an Arctic amplified anthropogenic warming. We compare annual reconstructed accumulation from the firn cores (1966–2015) to radar estimates and to annual re-analysis data (1980–2016) of precipitation subtracted evaporation from the regional climate model HIRHAM5, operated by the Danish Meteorological Institute. The spatial variability resembles that observed in earlier estimates with a clear increase west of the topographic divide and a low accumulation area across the north-eastern ice sheet. Our accumulation results are comparable to earlier firn core estimates, despite being larger in the east. We only find a positive significant trend in the accumulation for the period 2000–2010 to the northwest.

In the vicinity of the EGRIP deep ice core drilling site, we find variable accumulation patterns for two 15 km apart firn cores likely owing to local topographic effects as a result of the North East Greenland Ice Stream dynamics.

Helle Astrid Kjær et al.

Status: open (until 08 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Helle Astrid Kjær et al.

Helle Astrid Kjær et al.

Viewed

Total article views: 289 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
198 88 3 289 19 0 2
  • HTML: 198
  • PDF: 88
  • XML: 3
  • Total: 289
  • Supplement: 19
  • BibTeX: 0
  • EndNote: 2
Views and downloads (calculated since 11 Jan 2021)
Cumulative views and downloads (calculated since 11 Jan 2021)

Viewed (geographical distribution)

Total article views: 257 (including HTML, PDF, and XML) Thereof 253 with geography defined and 4 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 27 Jan 2021
Publications Copernicus
Download
Short summary
We have reconstructed accumulation in 6 firn cores and 8 snow cores in Northern Greenland and compared with a regional Climate model over Greenland. We find the model underestimate precipitation especially in north-eastern part of the ice cap- an important finding if aiming to reconstruct surface mass balance. Temperatures at 10 meters depth at 6 sites in Greenland were also determined and show a significant warming since the 1990's of 0.9 to 2.5 °C.
Citation