title: Stability of the Larsen B ice shelf on the Antarctic Peninsula during the Holocene epoch.
abstract: The stability of the Antarctic ice shelves in a warming climate has long been discussed, and the recent collapse of a significant part, over 12,500 km2 in area, of the Larsen ice shelf off the Antarctic Peninsula has led to a refocus toward the implications of ice shelf decay for the stability of Antarctica's grounded ice. Some smaller Antarctic ice shelves have undergone periodic growth and decay over the past 11,000 yr (refs 7-11), but these ice shelves are at the climatic limit of ice shelf viability and are therefore expected to respond rapidly to natural climate variability at century to millennial scales. Here we use records of diatoms, detrital material and geochemical parameters from six marine sediment cores in the vicinity of the Larsen ice shelf to demonstrate that the recent collapse of the Larsen B ice shelf is unprecedented during the Holocene. We infer from our oxygen isotope measurements in planktonic foraminifera that the Larsen B ice shelf has been thinning throughout the Holocene, and we suggest that the recent prolonged period of warming in the Antarctic Peninsula region, in combination with the long-term thinning, has led to collapse of the ice shelf.
authors.affiliation: Department of Geosciences, Hamilton College, Clinton, New York 13323, USA. edomack@hamilton.edu
authors.forename: Eugene
authors.initials: E
authors.lastname: Domack
authors.forename: Diana
authors.initials: D
authors.lastname: Duran
authors.forename: Amy
authors.initials: A
authors.lastname: Leventer
authors.forename: Scott
authors.initials: S
authors.lastname: Ishman
authors.forename: Sarah
authors.initials: S
authors.lastname: Doane
authors.forename: Scott
authors.initials: S
authors.lastname: McCallum
authors.forename: David
authors.initials: D
authors.lastname: Amblas
authors.forename: Jim
authors.initials: J
authors.lastname: Ring
authors.forename: Robert
authors.initials: R
authors.lastname: Gilbert
authors.forename: Michael
authors.initials: M
authors.lastname: Prentice
mesh_terms: D000818:Animals; D000864:Antarctic Regions; D002244:Carbon / Q000032:analysis; D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D002980:Climate; D017377:Diatoms / Q000378:metabolism; D005580:Fossils; D019015:Geologic Sediments / Q000737:chemistry; D017752:Greenhouse Effect; D049690:History, Ancient; D007053:Ice / Q000032:analysis*; D046448:Ice Cover; D008386:Marine Biology; D009792:Oceans and Seas; D010100:Oxygen / Q000032:analysis / Q000737:chemistry; D010103:Oxygen Isotopes; D010933:Plankton / Q000378:metabolism; D017215:Satellite Communications; D013696:Temperature; D013997:Time Factors
chemical_list: D007053:Ice; D010103:Oxygen Isotopes; D002734:Chlorophyll; D002244:Carbon; D010100:Oxygen; D000077194:Chlorophyll A