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Journal Article

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

Authors

Czymzik,  Markus
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Nowaczyk,  N.
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Dellwig,  Olaf
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Wegwerth,  Antje
External Organizations;

Muscheler,  Raimund
External Organizations;

Christl,  Marcus
External Organizations;

Arz,  Helge W.
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Citation

Czymzik, M., Nowaczyk, N., Dellwig, O., Wegwerth, A., Muscheler, R., Christl, M., Arz, H. W. (2020): Lagged atmospheric circulation response in the Black Sea region to Greenland Interstadial 10. - Proceedings of the National Academy of Sciences of the United States of America (PNAS), 117, 46, 28649-28654.
https://doi.org/10.1073/pnas.2005520117


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5004178
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.