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Climate evolution in the Adriatic Sea across the last deglaciation: A multiproxy approach combining biomarkers and calcareous plankton

Palaeogeography, Palaeoclimatology, Palaeoecology(2022)SCI 2区SCI 1区

Univ Milano Bicocca | SorbonneUniv | Univ Perugia | Univ Bari Aldo Moro | CNR | Univ Barcelona | Natl Res Council IGAG CNR | Ist Nazl Geofis & Vulcanol

Cited 2|Views29
Abstract
A multiproxy study combining calcareous plankton assemblages (coccolithophore and planktonic foraminifera), terrestrial (n-alkanes) and marine (alkenones) biomarkers was carried out in a sediment core (ND14Q-AR2) from the South Adriatic Sea. The focus of the study is to investigate millennial-to-centennial scale climate variability in the Eastern Mediterranean during the last deglaciation, between 20 and 11 ka BP. The high-resolution recon-struction allows for the characterization of the impact of the Heinrich Stadial 1 (HS1, here identified between 17.1 and 14.9 ka BP) at a centennial/multi-decadal time scale resolution. Based on terrestrial proxies, the HS1 interval has a two-fold partition: HS1a (17.1-15.9 ka BP), characterized by decreasing temperatures and relative high humidity, and HS1b (15.9-14.9 ka BP), characterized by the coldest temperatures and drier conditions on land. Terrestrial proxies suggest changes in moisture availability on land and ice melting delivery from the Alps during HS1. This period is followed by the Bolling-Allerod record (B-A, 14.9-12.3 ka BP) indicating ameliorated climate conditions and distinct local hydrological signals, related to global melt events similar to the Melt Water Pulse-1A. Finally, the comparison of our results with other Northern Hemisphere climatic records shows a good correspondence between the temperature variations in the South Adriatic Sea and the Greenland ice core oxygen isotope record, highlighting the climatic response of the South Adriatic to global climate variations. Comparison with other Mediterranean paleoclimatic records suggests a two-steps reorganization of the ocean/atmospheric circulation during the HS1 in the mid-and low-latitudes during the HS1 interval, but also a connection with the tropical Northern Hemisphere climate.
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Key words
Deglaciation,Heinrich Stadial 1,Adriatic Sea,Terrestrial and marine biomarkers,Calcareous plankton,Climate forcing
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要点】:该研究通过多代理方法分析南亚得里亚海沉积物核心,揭示了末次冰消期东地中海的气候演变及其与全球气候变化的联系。

方法】:研究结合了钙质浮游生物群(颗石藻和浮游有孔虫)、陆源(正构烷烃)和海洋(烯酮)生物标志物。

实验】:通过对南亚得里亚海ND14Q-AR2沉积物核心的高分辨率分析,研究了海因里希事件1(HS1)及其对气候的影响,并使用该数据与格陵兰冰芯氧同位素记录进行了对比,确认了南亚得里亚海对全球气候变化的响应,数据集名称未在摘要中提及。