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

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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)28649-28654
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number46
DOIs
Publication statusPublished - 2020

Subject classification (UKÄ)

  • Climate Research
  • Geology

Free keywords

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

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