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  Weakened AMOC related to cooling and atmospheric circulation shifts in the last interglacial Eastern Mediterranean

Levy, E. J., Vonhof, H. B., Bar-Matthews, M., Martinez-Garcia, A., Ayalon, A., Matthews, A., et al. (2023). Weakened AMOC related to cooling and atmospheric circulation shifts in the last interglacial Eastern Mediterranean. Nature Communications, 14(1): 5180. doi:10.1038/s41467-023-40880-z.

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 Creators:
Levy, Elan J.1, Author
Vonhof, Hubert B.2, Author           
Bar-Matthews, Miryam1, Author
Martinez-Garcia, Alfredo2, Author           
Ayalon, Avner1, Author
Matthews, Alan1, Author
Silverman, Vered1, Author
Raveh-Rubin, Shira1, Author
Zilberman, Tami1, Author
Yasur, Gal1, Author
Schmitt, Mareike2, Author           
Haug, Gerald H.2, Author           
Affiliations:
1external, ou_persistent22              
2Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              

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 Abstract: There is limited understanding of temperature and atmospheric circulation changes that accompany an Atlantic Meridional Overturning Circulation (AMOC) slowdown beyond the North Atlantic realm. A Peqi’in Cave (Israel) speleothem dated to the last interglacial period (LIG), 129–116 thousand years ago (ka), together with a large modern rainfall monitoring dataset, serve as the base for investigating past AMOC slowdown effects on the Eastern Mediterranean. Here, we reconstruct LIG temperatures and rainfall source using organic proxies (TEX86) and fluid inclusion water d-excess. The TEX86 data show a stepwise cooling from 19.8 ± 0.2° (ca. 128–126 ka) to 16.5 ± 0.6 °C (ca. 124–123 ka), while d-excess values decrease abruptly (ca. 126 ka). The d-excess shift suggests that rainfall was derived from more zonal Mediterranean air flow during the weakened AMOC interval. Decreasing rainfall d-excess trends over the last 25 years raise the question whether similar atmospheric circulation changes are also occurring today.

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Language(s): eng - English
 Dates: 2023-08-25
 Publication Status: Published online
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: 13 Volume / Issue: 14 (1) Sequence Number: 5180 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723