Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Svante Björck

Svante Björck

Professor emeritus

Svante Björck

The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt


  • Nathalie Van der Putten
  • Cyriel Verbruggen
  • Svante Björck
  • Elisabeth Michel
  • Jean-Robert Disnar
  • Emmanuel Chapron
  • Bertrand N. Moine
  • Jacques-Louis de Beaulieu

Summary, in English

The awareness of the significance of the Southern Ocean in the Earth's climate system has become increasingly obvious. The deglacial atmospheric CO2 rise during warming periods in Antarctica has been attributed to CO2 ventilation from the deep ocean caused by enhanced upwelling around the Antarctic Divergence. It has been hypothesized that, more intense Southern Hemisphere westerly winds aligned with the Antarctic Circumpolar Current due to a southward shift of the wind belt from its Last Glacial Maximum equator-ward position, are the main drivers. Reconstructions of past changes in atmospheric circulation in the Southern Hemisphere are still scarce and the overall picture is patchy with sometimes contradictory results. For obvious reasons, most terrestrial records originate from southern South America and New Zealand. Here we present a terrestrial record from the Indian sector of the Southern Ocean, from Kerguelen Islands located at 49 degrees S. A peat record is investigated using a multi-proxy approach (pollen and plant macrofossils, magnetic susceptibility, XRF analyses, biogenic silica content, Rock-Eval6 analysis and humification degree). Peat accumulation starts at about 16,000 cal yr BP with relatively warm and dry conditions. The most prominent change in our proxy data occurs at 13,600 cal yr BP, when peat ponds were established on the peat surface, resulting in lacustrine-type deposits, as a result of very high humidity, and with proxies implying very windy conditions. Within chronological uncertainties, this onset coincides with the onset of the so-called Oceanic Cold Reversal, based on the deuterium excess data in the EPICA Dome C ice core record. Kerguelen Islands are located in the moisture source area of Dome C and a change in atmospheric circulation at that time could explain both records. Around 12,900 cal yr BP, at the end of the Antarctic Cold Reversal, pond/lake sediments give way to more peaty deposits, with proxies suggesting slightly drier, less windy and probably warmer conditions. Kerguelen Islands became less influenced by the Southern Hemisphere westerly winds and these conditions were amplified during the early Holocene climate optimum as found in Antarctic ice core records. (C) 2015 Elsevier Ltd. All rights reserved.


  • Kvartärgeologi
  • MERGE: ModElling the Regional and Global Earth system








Quaternary Science Reviews




Artikel i tidskrift




  • Geology


  • Palaeoclimatology
  • Last Termination
  • Peat record
  • Kerguelen Islands
  • Southern Ocean
  • Indian Ocean
  • Oceanic Cold Reversal
  • Southern Hemisphere
  • westerly belt




  • ISSN: 0277-3791