Roy M. Koerner
Geological Survey of Canada
OceanographyGeologySea iceArctic ice packIce core
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Publications 64
#1Sarah BoonH-Index: 16
#2David O. BurgessH-Index: 20
Last. Martin SharpH-Index: 28
view all 4 authors...
The Devon Island ice cap has been the subject of scientific study for almost half a century, beginning with the first mass balance measurements in 1961. Research on the ice cap was the first to investigate (1) the role of meltwater in seasonal ice-velocity variations on a polythermal Arctic ice cap, (2) the use of air temperature rather than net radiation as a proxy for the energy driving surface melt, and (3) the influence of the changing frequency of specific synoptic weather configurations on...
22 CitationsSource
#1Bo M Vinther (UCPH: University of Copenhagen)H-Index: 38
#2Susanne L Buchardt (UCPH: University of Copenhagen)H-Index: 11
Last. Anders Svensson (UCPH: University of Copenhagen)H-Index: 38
view all 14 authors...
The response of the Greenland ice sheet (GIS) to changes in climate remains uncertain. During the Holocene climatic optimum — an unusually warm period from about 9,000 to 6,000 years ago — changes in Greenland appear inconsistent with the rest of the Northern Hemisphere. Here, the Greenland Holocene temperature history and the evolution of GIS surface elevation are extracted from four GIS locations; the results may resolve this disparity.
268 CitationsSource
#1Alex S. GardnerH-Index: 21
#2Martin SharpH-Index: 56
Last. David LewisH-Index: 1
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Distributed glacier surface melt models are often forced using air temperature fields that are either downscaled from climate models or reanalysis, or extrapolated from station measurements. Typically, the downscaling and/or extrapolation are performed using a constanttemperaturelapserate, which is often taken to be the free-air moist adiabatic lapse rate (MALR: 68‐78 Ck m 21 ). To explore the validity of this approach, the authors examined altitudinal gradients in daily mean air temperature alo...
94 CitationsSource
#1Bo M Vinther (UCPH: University of Copenhagen)H-Index: 38
#2Susanne L Buchardt (UCPH: University of Copenhagen)H-Index: 11
Last. Sune Olander Rasmussen (UCPH: University of Copenhagen)H-Index: 34
view all 12 authors...
3 CitationsSource
#1Christophe Kinnard (U of O: University of Ottawa)H-Index: 20
#2Roy M. Koerner (Geological Survey of Canada)H-Index: 31
Last. Bernard Lauriol (U of O: University of Ottawa)H-Index: 20
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[1] High-resolution (1 mm) stratigraphic information was derived from digital image analysis of an ice core from the Prince of Wales (POW) Icefield, Central Ellesmere Island, Canada. Following careful image processing, a profile of ice core transmitted light was derived from the greyscale images and used to reconstruct high-resolution density variations for the unfractured sections of the core. Images were further classified into infiltration and glacier ice using an automatic thresholding proce...
20 CitationsSource
#1David A. Fisher (Geological Survey of Canada)H-Index: 37
#2Erich C. Osterberg (UMaine: University of Maine)H-Index: 14
Last. Summer Rupper (BYU: Brigham Young University)H-Index: 10
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The ice core recovered from Prospector Russell Col on Mt Logan (5.4 km a.s.l.), in the Yukon spans over 20 000 years. This unique record offers a Pacific view of the stable isotope and chemical record from the Lateglacial to the present. The timescale is based on seasonal counted years, the largest known volcanic acid signatures and the major shift in stable isotopes and chemistry at the end of the Younger Dryas. There are large and sustained changes in the stable isotopic record that are anti-c...
70 CitationsSource
#1B. M. Vinther (UEA: University of East Anglia)H-Index: 2
#2Henrik Brink Clausen (Niels Bohr Institute)H-Index: 5
Last. Anders Svensson (Niels Bohr Institute)H-Index: 38
view all 10 authors...
[1] Four ice cores from the Agassiz ice cap in the Canadian high arctic and one ice core from the Renland ice cap in eastern Greenland have been synchronized to the Greenland Ice Core Chronology 2005 (GICC05) which is based on annual layer counts in the DYE-3, GRIP and NGRIP ice cores. Volcanic reference horizons, seen in electrical conductivity measurements (ECM) have been used to carry out the synchronization throughout the Holocene. The Agassiz ice cores have been matched to the NGRIP ice cor...
74 CitationsSource
#1Christophe Kinnard (U of O: University of Ottawa)H-Index: 20
#2Christian Zdanowicz (Geological Survey of Canada)H-Index: 21
Last. David A. Fisher (Geological Survey of Canada)H-Index: 37
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[1] Changes in the extent of seasonal ice were investigated using historical and satellite observations for the period 1870–2003. The seasonal ice zone (SIZ) has been gradually expanding since 1870, with a marked acceleration over the past three decades, and has migrated north to encompass all peripheral Arctic seas. The expansion of the SIZ may be increasing the salinity of the upper Arctic Ocean, consistent with recent observations. The migration of the SIZ over continental shelves may also be...
29 CitationsSource
Ice core and mass balance studies from glaciers, ice caps and ice sheets constitute an ideal medium for monitoring and studying present and past environmental change and, as such, make a valuable contribution to the present debate over anthropogenic forcing of climate. Data derived from 32 years of measurements in the Canadian Arctic show no significant trends in glacier mass balance, ice melt, or snow accumulation, although the mass balance continues to be slightly negative. Models suggest that...
10 CitationsSource
#1Ian D. Clark (U of O: University of Ottawa)H-Index: 26
#2Lori A. Henderson (U of O: University of Ottawa)H-Index: 2
Last. Jean-Marc Barnola (CNRS: Centre national de la recherche scientifique)H-Index: 39
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[1] Firn air and ice have been sampled and analyzed for trace gases (CO2, N2O, CH4, and CO) and isotopes (14C, 13C, and 18O of CO2; 3H of ice) at 3 m intervals from the surface to the depth of closure at 60 m on the Devon Island Ice Cap, a low-elevation permanent glacier in the Canadian Arctic Islands, to investigate firn diffusion and the effects of summer melting. The 14CO2 profile from the permeable firn includes the 1963 thermonuclear peak at a depth of 53.9 ± 1.5 m. The twofold increase and...
15 CitationsSource