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Bipolar volcanic synchronization of abrupt climate change in Greenland and Antarctic ice cores during the last glacial period

Svensson, Anders (författare)
University of Copenhagen
Dahl-Jensen, Dorthe (författare)
University of Copenhagen
Steffensen, Jørgen Peder (författare)
University of Copenhagen
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Blunier, Thomas (författare)
University of Copenhagen
Rasmussen, Sune O. (författare)
University of Copenhagen
Vinther, Bo M. (författare)
University of Copenhagen
Vallelonga, Paul (författare)
University of Western Australia, Crawley,University of Copenhagen
Capron, Emilie (författare)
University of Copenhagen
Gkinis, Vasileios (författare)
University of Copenhagen
Cook, Eliza (författare)
University of Copenhagen
Astrid Kjær, Helle (författare)
University of Copenhagen
Muscheler, Raimund (författare)
Lund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kvartärgeologi,Geologiska institutionen,Centre for Environmental and Climate Science (CEC),Faculty of Science,Quaternary Sciences,Department of Geology
Kipfstuhl, Sepp (författare)
University of Copenhagen,Alfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven
Wilhelms, Frank (författare)
Alfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven
Stocker, Thomas F. (författare)
University of Bern
Fischer, Hubertus (författare)
University of Bern
Adolphi, Florian (författare)
Lund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kvartärgeologi,Geologiska institutionen,Centre for Environmental and Climate Science (CEC),Faculty of Science,Quaternary Sciences,Department of Geology,University of Bern
Erhardt, Tobias (författare)
University of Bern
Sigl, Michael (författare)
University of Bern
Landais, Amaelle (författare)
Laboratoire des Sciences du Climat et de l'Environnement
Parrenin, Frédéric (författare)
University Grenoble Alpes
Buizert, Christo (författare)
Oregon State University
McConnell, Joseph R. (författare)
Desert Research Institute, Reno
Severi, Mirko (författare)
University of Florence
Mulvaney, Robert (författare)
British Antarctic Survey
Bigler, Matthias (författare)
University of Bern
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 (creator_code:org_t)
2020-08-19
2020
Engelska 16 s.
Ingår i: Climate of the Past. - : Copernicus GmbH. - 1814-9324 .- 1814-9332. ; 16:4, s. 1565-1580
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • The last glacial period is characterized by a number of millennial climate events that have been identified in both Greenland and Antarctic ice cores and that are abrupt in Greenland climate records. The mechanisms governing this climate variability remain a puzzle that requires a precise synchronization of ice cores from the two hemispheres to be resolved. Previously, Greenland and Antarctic ice cores have been synchronized primarily via their common records of gas concentrations or isotopes from the trapped air and via cosmogenic isotopes measured on the ice. In this work, we apply ice core volcanic proxies and annual layer counting to identify large volcanic eruptions that have left a signature in both Greenland and Antarctica. Generally, no tephra is associated with those eruptions in the ice cores, so the source of the eruptions cannot be identified. Instead, we identify and match sequences of volcanic eruptions with bipolar distribution of sulfate, i.e. unique patterns of volcanic events separated by the same number of years at the two poles. Using this approach, we pinpoint 82 large bipolar volcanic eruptions throughout the second half of the last glacial period (12-60ka). This improved ice core synchronization is applied to determine the bipolar phasing of abrupt climate change events at decadal-scale precision. In response to Greenland abrupt climatic transitions, we find a response in the Antarctic water isotope signals (δ18O and deuterium excess) that is both more immediate and more abrupt than that found with previous gas-based interpolar synchronizations, providing additional support for our volcanic framework. On average, the Antarctic bipolar seesaw climate response lags the midpoint of Greenland abrupt δ18O transitions by 122±24 years. The time difference between Antarctic signals in deuterium excess and δ18O, which likewise informs the time needed to propagate the signal as described by the theory of the bipolar seesaw but is less sensitive to synchronization errors, suggests an Antarctic δ18O lag behind Greenland of 152±37 years. These estimates are shorter than the 200 years suggested by earlier gas-based synchronizations. As before, we find variations in the timing and duration between the response at different sites and for different events suggesting an interaction of oceanic and atmospheric teleconnection patterns as well as internal climate variability.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)

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