Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle
| العنوان: | Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle |
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| المؤلفون: | Antonio García-Alix, Yurena Yanes, María J. Ramos-Román, Alejandro López-Avilés, Enno Schefuß, Jaime L. Toney, Gonzalo Jiménez-Moreno, Dirk Sachse, Jon Camuera, Francisco J. Jiménez-Espejo, R. Scott Anderson |
| المساهمون: | Ministerio de Economía y Competitividad (España), Junta de Andalucía, European Commission, Department of Geosciences and Geography |
| المصدر: | Global and Planetary Change Digital.CSIC. Repositorio Institucional del CSIC instname Digibug: Repositorio Institucional de la Universidad de Granada Universidad de Granada (UGR) Digibug. Repositorio Institucional de la Universidad de Granada |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Mediterranean climate, 1171 Geosciences, 010504 meteorology & atmospheric sciences, Orbital forcing, Last glacial-interglacial transition, 02 engineering and technology, Oceanography, Monsoon, 01 natural sciences, West African monsoon, Mid-low latitude rainfall systems, 0202 electrical engineering, electronic engineering, information engineering, 14. Life underwater, Precipitation, Glacial period, Holocene, 0105 earth and related environmental sciences, Hydrogen isotopes, Global and Planetary Change, Paleohydrology, Northern Hemisphere, 020206 networking & telecommunications, Western Mediterranean precipitation, Leaf waxes, 13. Climate action, Climatology, Climate model, Southern Iberian Peninsula, Geology |
| الوصف: | This study was supported by the project B-RNM-144-UGR18 of the action "Proyectos I+D+i del Programa Operativo FEDER 2018 -Junta de Andalucia-UGR", the projects CGL2013-47038-R and CGL201785415-R, of the "Ministerio de Economia y Competitividad of Spain and Fondo Europeo de Desarrollo Regional FEDER", and the research group RNM-190 (Junta de Andalucia). A.G.-A. was also supported by a Marie Curie Intra-European Fellowship of the 7th Framework Programme for Research, Technological Development and Demonstration of the European Commission (NAOSIPUK. Grant Number: PIEF-GA-2012-623027) and by a Ram ' on y Cajal Fellowship RYC-2015-18966 of the Spanish Government (Ministerio de Economia y Competividad). J.C. acknowledges the postdoctoral funding provided by the Academy of Finland (project number 316702). J.L.T. hosted the NAOSIPUK project (PIEFGA-2012-623027) at the University of Glasgow. A.L.-A PhD is funded by BES-2018-084293 (Ministerio de Economia y Competividad). M.J.R.R. acknowledges the postdoctoral funding by the European Research Council (ERC-2017-ADG-788616). This study was supported by an ERC Consolidator Grant (STEEPclim) to D.S. (Grant Agreement No. 647035). E.S. is supported by the DFG Cluster of Excellence 2077 >The Ocean Floor -Earth's Uncharted Interface < at MARUM. We thank Ralph Kreutz for analytical support. The transitional regions between the low and high latitudes of the Northern Hemisphere are highly vulnerable to future climate change yet most of the current climate models usually diverge in their projections. To better understand the dynamics in these regions, the reconstruction of past hydrological fluctuations and precipitation patterns is of paramount importance to accurately constrain present and future climate scenarios. In this study, we investigated paleohydrological dynamics in the western Mediterranean region, a transitional zone between low-mid latitudes and Atlantic - Mediterranean realms. We reconstruct precipitation and moisture source changes during the last -35 ka in order to propose the potential mechanisms driving these oscillations. To do so, we use hydrogen isotopes from sedimentary leaf waxes, more specifically the C31 n-alkane homologue, and a precipitation proxy based on previously published pollen data from a sedimentary core (Padul-15-05) in southern Iberia (Padul wetland -37-N). With this combination we disentangle the coupled effect of precipitation amount and source on the hydrogen isotopic signature of the studied C31 n-alkane record. Our results show three main periods characterized by different precipitation patterns. Low precipitation, mainly linked to a significant contribution from an isotopically-enriched Mediterranean precipitation source, occurred from -30 to -15.5 ka BP and during the last -5 ka, whereas enhanced precipitation with a predominant isotopically-depleted Atlantic precipitation source prevailed from -15.5 to -5 ka BP. This latter stage is here defined as the Western Mediterranean Humid Period (WMHP). In addition, some occasional millennial-scale opposite precipitation patterns can be observed during these climatically distinct periods. These changes in the source of precipitation were likely coupled to a shift in the main rainy season from winter, when Atlantic precipitation prevailed, to late winter-early spring, when the contribution of Mediterranean moisture is higher. Comparison between the studied mid-latitude terrestrial Padul-15-05 core and a low-latitude marine record offshore of northwestern Africa shows clear long-term synchronous responses of both western Mediterranean precipitation and western African monsoon systems to northern Hemisphere atmospheric dynamics, ultimately controlled by orbital forcing and ice-sheets fluctuations. action "Proyectos I+D+i del Programa Operativo FEDER 2018 -Junta de Andalucia-UGR" B-RNM-144-UGR18 Ministerio de Economia y Competitividad of Spain CGL2013-47038-R CGL201785415-R Junta de Andalucia RNM-190 Marie Curie Intra-European Fellowship of the 7th Framework Programme for Research, Technological Development and Demonstration of the European Commission (NAOSIPUK) PIEF-GA-2012-623027 Spanish Government (Ministerio de Economia y Competividad) RYC-2015-18966 Academy of Finland European Commission 316702 NAOSIPUK project at the University of Glasgow PIEFGA-2012-623027 Ministerio de Economia y Competividad BES-2018-084293 European Research Council (ERC) European Commission ERC-2017-ADG-788616 ERC Consolidator Grant (STEEPclim) 647035 DFG Cluster of Excellence 2077 >The Ocean Floor -Earth's Uncharted Interface < at MARUM European Commission |
| وصف الملف: | application/pdf |
| تدمد: | 2013-4703 2015-1896 0921-8181 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f44345e7c7e147e81749afc2564c9454 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007493 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....f44345e7c7e147e81749afc2564c9454 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20134703 20151896 09218181 |
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