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

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...

Full description

Bibliographic Details
Published in:Proceedings of the National Academy of Sciences
Main Authors: Czymzik, Markus, Nowaczyk, Norbert R., Dellwig, Olaf, Wegwerth, Antje, Muscheler, Raimund, Christl, Marcus, Arz, Helge W.
Format: Article in Journal/Newspaper
Language:English
Published: National Academy of Sciences 2020
Subjects:
Climate Research
Geology
archive synchronization
Black Sea sediments
climate
cosmogenic radionuclides
phase relationship
Greenland
Greenland ice cores
Online Access:https://lup.lub.lu.se/record/fbbe6382-dc30-46ea-8ecd-9f1fcff2b6f9
https://doi.org/10.1073/pnas.2005520117
Description
Summary: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.

Similar Items