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Raimund Muscheler

Raimund Muscheler

Professor

Raimund Muscheler

Lagged atmospheric circulation response in the Black Sea region to Greenland Interstadial 10

Författare

  • Markus Czymzik
  • Norbert R. Nowaczyk
  • Olaf Dellwig
  • Antje Wegwerth
  • Raimund Muscheler
  • Marcus Christl
  • Helge W. Arz

Summary, in English

Northern Hemispheric high-latitude climate variations during the last glacial are expected to propagate globally in a complex way. Investigating the evolution of these variations requires a precise synchronization of the considered environmental archives. Aligning the globally common production rate variations of the cosmogenic radionuclide 10Be in different archives provides a tool for such synchronizations. Here, we present a 10Be record at <40-y resolution along with subdecadal proxy records from one Black Sea sediment core around Greenland Interstadial 10 (GI-10) ∼41 ka BP and the Laschamp geomagnetic excursion. We synchronized our 10Be record to that from Greenland ice cores based on its globally common production rate variations. The synchronized environmental proxy records reveal a bipartite climate response in the Black Sea region at the onset of GI-10. First, in phase with Greenland warming, reduced sedimentary coastal ice rafted detritus contents indicate less severe winters. Second, and with a lag of 190 (± 44) y, an increase in the detrital K/Ti ratio and authigenic Ca precipitation point to enhanced regional precipitation and warmer lake surface temperatures. We explain the lagged climatic response by a shift in the dominant mode of atmospheric circulation, likely connected with a time-transgressive adjustment of the regional thermal ocean interior to interstadial conditions.

Avdelning/ar

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

Publiceringsår

2020

Språk

Engelska

Sidor

28649-28654

Publikation/Tidskrift/Serie

Proceedings of the National Academy of Sciences of the United States of America

Volym

117

Issue

46

Dokumenttyp

Artikel i tidskrift

Förlag

National Academy of Sciences

Ämne

  • Climate Research
  • Geology

Nyckelord

  • archive synchronization
  • Black Sea sediments
  • climate
  • cosmogenic radionuclides
  • phase relationship

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 1091-6490