Fossil leaf wax hydrogen isotopes reveal variability of Atlantic and Mediterranean climate forcing on the southeast Iberian Peninsula between 6000 to 3000 cal. BP

Autor:	Ralph R Schneider, Mara Weinelt, Nils Andersen, Julien Schirrmacher
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	Mediterranean climate Atmospheric Science Geologic Sediments Rain Marine and Aquatic Sciences Forcing (mathematics) Plant Science Oceanography Paleooceanography Peninsula Carbon Radioisotopes Holocene History Ancient Sedimentary Geology Climatology Multidisciplinary geography.geographical_feature_category Fossils Plant Anatomy Geology Europe Chemistry Physical Sciences Medicine Pollen Seasons Research Article Chemical Elements Science Climate Change Climate change Gas Chromatography-Mass Spectrometry Meteorology Spatio-Temporal Analysis Paleoclimatology Precipitation Petrology geography Biology and Life Sciences Paleontology Plant Leaves North Atlantic oscillation Waxes Earth Sciences Environmental science Sediment Hydrogen
Zdroj:	PLoS ONE PLoS ONE, Vol 15, Iss 12, p e0243662 (2020)
ISSN:	1932-6203
Popis:	Many recently published papers have investigated the spatial and temporal manifestation of the 4.2 ka BP climate event at regional and global scales. However, questions with regard to the potential drivers of the associated climate change remain open. Here, we investigate the interaction between Atlantic and Mediterranean climate forcing on the south-eastern Iberian Peninsula during the mid- to late Holocene using compound-specific hydrogen isotopes from fossil leaf waxes preserved in marine sediments. Variability of hydrogen isotope values in the study area is primarily related to changes in the precipitation source and indicates three phases of increased Mediterranean sourced precipitation from 5450 to 5350 cal. BP, from 5150 to 4300 cal. BP including a short-term interruption around 4800 cal. BP, and from 3400 to 3000 cal. BP interrupted around 3200 cal. BP. These phases are in good agreement with times of prevailing positive modes of the North Atlantic Oscillation (NAO) and reduced storm activity in the Western Mediterranean suggesting that the NAO was the dominant modulator of relative variability in precipitation sources. However, as previously suggested other modes such as the Western Mediterranean Oscillation (WeMO) may have altered this overall relationship. In this regard, a decrease in Mediterranean moisture source coincident with a rapid reduction in warm season precipitation during the 4.2 ka BP event at the south-eastern Iberian Peninsula might have been related to negative WeMO conditions.
Databáze:	OpenAIRE
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