Article ; Online: Assessing atmospheric and oceanic teleconnections between the eastern and western Mediterranean over the past 8000 years
The Holocene. 2024 Feb., v. 34, no. 2 p.162-174
2024
Abstract: Holocene climate records from the Mediterranean are marked by pervasive millennial to centennial-scale climate variability. Here, we investigate East-West Mediterranean atmospheric and oceanic teleconnections by computing phase-relationships between ... ...
| Abstract | Holocene climate records from the Mediterranean are marked by pervasive millennial to centennial-scale climate variability. Here, we investigate East-West Mediterranean atmospheric and oceanic teleconnections by computing phase-relationships between oxygen isotope (δ¹⁸O) records generated on Soreq (East) and Chorchia (West) spelaeothems, as well as between δ¹⁸O and carbon isotope (δ¹³C) records from planktonic and benthic foraminifera from core PS009PC (East, Levantin Basin), ODP Site 963D (Central, Sicily Strait), and core KESC9-14 (West, Ligurian Basin). These marine sites are all located at intermediate water depths (560–460 m depth). Hence, the benthic foraminiferal δ¹⁸O records reflect mainly the intermediate ocean temperature/δ¹⁸O of the water mass, and the benthic δ¹³C is a proxy for the intensity of water flowing at the studied depth called Levantine Intermediate Water (LIW). For both western and eastern cores, the planktonic stable isotopic records reflect the climate-induced activity of the nearby river system. We find broadly in-phase relationships between the spelaeothem δ¹⁸O records and between the planktonic δ¹⁸O and δ¹³C records at most multi-centennial and millennial periodicities. This is indicative of closely linked (hydro-) climatic conditions in Southern Europe, the Levant, and North Africa over the last 8000 years. Conversely, at intermediate water depths, we find a distinct out-of-phase relationship between the East/Central and West Mediterranean benthic δ¹⁸O and δ¹³C records at 1000–2000 years periodicities. We interpret this see-saw pattern as indicative of a persistent regional influence of LIW on oceanographic conditions in the intermediate depths of the eastern basin. Conversely, we suggest a strong influence of the modified Atlantic Ocean inflow (MAW) in the intermediate water formation in the Western Mediterranean (‘Winter Intermediate Water’; WIW). This WIW overprints, at least partially, the LIW signal that reaches the western Mediterranean causing the out-of-phase relationship between the east and the west oceanographic signals at intermediate depths. |
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| Keywords | Holocene epoch ; Retaria ; basins ; carbon ; climatic factors ; oxygen isotopes ; plankton ; rivers ; Atlantic Ocean ; Northern Africa ; Sicily ; Southern European region ; E-W teleconnection ; Holocene ; Levantine intermediate water ; Mediterranean Sea ; Paleocirculation ; spectral analyses |
| Language | English |
| Dates of publication | 2024-02 |
| Size | p. 162-174. |
| Publishing place | SAGE Publications |
| Document type | Article ; Online |
| ZDB-ID | 2027956-5 |
| ISSN | 1477-0911 ; 0959-6836 |
| ISSN (online) | 1477-0911 |
| ISSN | 0959-6836 |
| DOI | 10.1177/09596836231211807 |
| Database | NAL-Catalogue (AGRICOLA) |
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