Holocene vegetation history and quantitative climate reconstructions in a high-elevation oceanic district of the Italian Alps. Evidence for a middle to late Holocene precipitation increase
Autor: | Lorena Garozzo, Michele Brunetti, Cesare Ravazzi, Roberto Comolli, Massimo Domenico Novellino, Valter Maggi, G Furlanetto, F Valle, Roberta Pini |
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Přispěvatelé: | Furlanetto, G, Ravazzi, C, Pini, R, Vallè, F, Brunetti, M, Comolli, R, Novellino, M, Garozzo, L, Maggi, V |
Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Mediterranean climate
010506 paleontology Archeology 010504 meteorology & atmospheric sciences Stratigraphy Speleothem 01 natural sciences Vegetation Dynamics Paleoclimatology Pollen Accumulation Rate Alnus viridis Precipitation Ecology Evolution Behavior and Systematics Holocene 0105 earth and related environmental sciences Global and Planetary Change geography geography.geographical_feature_category Archeology (arts and humanities) biology Vegetation dynamic Geology Glacier Vegetation biology.organism_classification Ecology Evolution Behavior and Systematic Timberline Europe Physical geography Pollen Accumulation Rates |
Zdroj: | Quaternary science reviews 200 (2018): 212–236. doi:10.1016/j.quascirev.2018.10.001 info:cnr-pdr/source/autori:Giulia Furlanetto, Cesare Ravazzi, Roberta Pini, Francesca Vallè, Michele Brunetti, Roberto Comolli, Massimo Domenico Novellino, Lorena Garozzo, Valter Maggi/titolo:Holocene vegetation history and quantitative climate reconstructions in a high-elevation oceanic district of the Italian Alps. Evidence for a middle to late Holocene precipitation increase/doi:10.1016%2Fj.quascirev.2018.10.001/rivista:Quaternary science reviews/anno:2018/pagina_da:212/pagina_a:236/intervallo_pagine:212–236/volume:200 |
Popis: | We reconstructed the vegetation and climate history during the last 10 ka in a high-elevation sedimentary record (Armentarga peat bog, 2345 m asl) on the southern flank of the European Alps through the study of paleoecological and sedimentary proxies. We included a specific elevational transect of modern Pollen Accumulation Rates for timberline-forming trees and shrubs (Alnus viridis, Pinus sylvestris/mugo, Pinus cembra). Quantitative reconstructions of July temperature and annual precipitation were obtained by applying numerical transfer functions built on an extensive pollen-climate calibration set from the European Alps. Changes in elevational vegetation arrangement were primarily driven by phases of precipitation increase, and to a lesser extent by millennial-scale temperature changes already known from glacier, timberline, chironomids and speleothem records at Alpine scale. Changes in pollen-inferred annual precipitation occurred in three main steps. An early Holocene moderately humid phase is mirrored by the early spread of Alnus viridis dwarf forests. Precipitation started to increase at 6.2 ka cal BP. A further, prominent step forward at the Middle to Late Holocene transition led to the high values of snowfall and runoff characterizing today's oceanic elevational climates of the outer Italian Alps. This change led to timberline depression and grassland expansion. Locally, human impact was weak at the Late Neolithic/Bronze Age transition. This event correlates with lake level oscillations in the northern Mediterranean borderlands, suggesting intensification of southern air masses conveyed by Tyrrhenian cyclones towards windward districts. |
Databáze: | OpenAIRE |
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