Title Spatial and temporal variability of net accumulation from shallow cores from Vestfonna ice cap (Nordaustlandet, Svalbard)
Author Beaudon, E.; Arppe, L.; Jonsell, U.; Martma, T.; Moller, M.; Pohjola, V.A.; Scherer, D.; Moore, J.C.
Author Affil Beaudon, E., University of Lapland, Arctic Centre, Rovaniemi, Finland. Other: University of Lapland, Finland; Gdynia Maritime University, Poland; University of Helsinki, Finland; Universidad Politécnica de Madrid, Spain
Source The International Polar Year Project 'KINNVIKA'; Arctic warming and impact research at 80°N, prefaced by V.A. Pohjola, P. Kankaanpaa, J.C. Moore and T. Pastusiak. Geografiska Annaler. Series A: Physical Geography, 93(4), p.287-299, . Publisher: Wiley-Blackwell published on behalf of Svenska Saellskapet foer Antropologi och Geografi, Stockholm, Sweden. ISSN: 0435- 3676
Publication Date Dec. 2011
Notes In English. 23 refs. CRREL Acc. No: 66000714
Index Terms firn; glacial geology; ice; isotopes; oxygen; paleoclimatology; Spitsbergen-- Nordaustlandet; annual variations; Arctic region; Cenozoic; ice caps; ice cores; International Polar Year 2007-08; IPY 2007-08 Research Publications; isotope ratios; Nordaustlandet; O-18/O-16; paleoatmosphere; Quaternary; sea ice; Spitsbergen; stable isotopes; Svalbard; Vestfonna ice cap; winds
Abstract We analyse ice cores from Vestfonna ice cap (Nordaustlandet, Svalbard). Oxygen isotopic measurements were made on three firn cores (6.0, 11.0 and 15.5 m deep) from the two highest summits of the glacier located on the SW-NE and NW-SE central ridges. Sub- annual delta 18O cycles were preserved and could be counted visually in the uppermost parts of the cores, but deeper layers were affected by post-depositional smoothing. A ronounced delta 18O minimum was found near the bottom of the three cores. We consider candidates for this delta 18O signal to be a valuable reference horizon since it is also seen elsewhere in Nordaustlandet. We attribute it to isotopically depleted snow precipitation, which NCEP/NCAR reanalysis shows was unusual for Vestfonna, and came from northerly air during the cold winter of 1994/95. Finding the 1994/95 time marker allows establishment of a precise depth/age scale for the three cores. The derived annual accumulation rates indirectly fill a geographical gap in mass balance measurements and thus provide information on spatial and temporal variability of precipitation over the glacier for the period spanned by the cores (1992-2009). Comparing records at the two locations also reveals that the snow net accumulation at the easternmost part of Vestfonna was only half of that in the western part over the last 17 years. Abstract Copyright (2011), Swedish Society for Anthropology and Geography.
URL http://hdl.handle.net/10.1111/j.1468-0459.2011.00439.x
Publication Type journal article
Record ID 311067