acceleration
; deuterium
; glacier advance
; glacier mass balance
; glacier retreat
; ice core
; ice shelf
; snowmelt
; twentieth century
; Antarctic Peninsula
; Antarctica
; James Ross Island
; West Antarctica
英文摘要:
Over the past 50 years, warming of the Antarctic Peninsula has been accompanied by accelerating glacier mass loss and the retreat and collapse of ice shelves. A key driver of ice loss is summer melting; however, it is not usually possible to specifically reconstruct the summer conditions that are critical for determining ice melt in Antarctic. Here we reconstruct changes in ice-melt intensity and mean temperature on the northern Antarctic Peninsula since AD 1000 based on the identification of visible melt layers in the James Ross Island ice core and local mean annual temperature estimates from the deuterium content of the ice. During the past millennium, the coolest conditions and lowest melt occurred from about AD 1410 to 1460, when mean temperature was 1.6C lower than that of 1981-2000. Since the late 1400s, there has been a nearly tenfold increase in melt intensity from 0.5 to 4.9%. The warming has occurred in progressive phases since about AD 1460, but intensification of melt is nonlinear, and has largely occurred since the mid-twentieth century. Summer melting is now at a level that is unprecedented over the past 1,000 years. We conclude that ice on the Antarctic Peninsula is now particularly susceptible to rapid increases in melting and loss in response to relatively small increases in mean temperature.
British Antarctic Survey, Natural Environment Research Council, Cambridge CB3 0ET, United Kingdom; Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia; UJF-Grenoble 1, CNRS Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE) UMR 5183, Grenoble F-38041, France; Alfred Wegener Institute for Polar and Marine Research, D-27568 Bremerhaven, Germany; Graduate School of Geography, Clark University, Worcester, MA 01610, United States; Institut de Recherche Pour le Développement, Laboratoire HydroSciences Montpellier et Laboratoire des Sciences du Climat et de l'Environment, 91191 Gif-sur-Yvette, France; NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth NG12 5GG, United Kingdom
Recommended Citation:
Abram N.J.,Mulvaney R.,Wolff E.W.,et al. Acceleration of snow melt in an Antarctic Peninsula ice core during the twentieth century[J]. Nature Geoscience,2013-01-01,6(5)