Autor: |
Jouve, Guillaume, Vidal, Laurence, Adallal, Rachid, Rhoujjati, Ali, Benkaddour, Abdelfattah, Chapron, Emmanuel, Tachikawa, Kazuyo, Bard, Edouard, Courp, Thierry, Dezileau, Laurent, Hebert, Bertil, Rapuc, William, Simonneau, Anaëlle, Sonzogni, Corinne, Sylvestre, Florence |
Předmět: |
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Zdroj: |
Quaternary Research; Jan2019, Vol. 91 Issue 1, p414-430, 17p |
Abstrakt: |
Study of the hydro-sedimentary dynamics of lakes provides key information on hydrological changes. In this work, we investigate Lake Azigza in the Moroccan Middle Atlas, a region that suffers from a scarcity of observational hydrological data necessary for a coherent management of water resources. Sedimentary deposits of Lake Azigza (32°58′N, 5°26′W, 1,550 m above sea level) were dated and analyzed by combining geochemical and mineralogical measurements coupled with microfacies characterization for the last 134 yr. The detrital component derived from X-ray fluorescence elemental composition and microstructures analysis of the lake sediments provided proxies of runoff activity and lake-level changes, respectively. These proxies were calibrated with regional hydro-climatic and instrumental measurements available over the last 50 yr and used to reconstruct past hydrological changes on inter-annual to decadal time scales between 1879 and 2013. Since 1879, lake level and runoff proxies responded in phase to regional inter-annual precipitation variations. We also show that after the major lake-level drop observed in 2008, the response of the runoff proxy to variable precipitation regime is enhanced. Such an approach emphasizes the potential of these hydro-climate-sensitive sedimentary archives to assess the impact of climate change in the Mediterranean region. [ABSTRACT FROM AUTHOR] |
Databáze: |
Complementary Index |
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