Descripción del proyecto
Un estudio más detallado sobre la evolución de los vientos alisios
Las proyecciones sobre la disponibilidad de agua son inciertas. Los científicos avisan de una reducción en la cuenca mediterránea, influida por circulaciones atmosféricas sinópticas que tienen lugar en invierno. Por lo que se refiere a los vientos alisios, desempeñan un papel fundamental en la distribución tanto de lluvias como de calor. A pesar de que el Holoceno ha sido ampliamente estudiado para conocer mejor el clima y probar la eficacia de modelos climáticos y variables sustitutivas, la cuestión de los mecanismos y la evolución de los vientos alisios todavía está por resolver. Para abordar esta laguna de conocimientos, el proyecto financiado con fondos europeos CROSSROADS estudiará sedimentos del Holoceno recuperados de las profundidades del mar Muerto, donde la temperatura está influenciada por la temperatura del aire en invierno y su nivel depende de las descargas del río Jordán, que son alimentadas por las lluvias de invierno.
Objetivo
Water availability in the Mediterranean basin is projected to decrease in the future in the 6th IPCC report. It is largely influenced by wintertime synoptic atmospheric circulations, as the westerlies play a crucial role in the distribution of both rainfall and heat. However, to date, climate models have lacked the accuracy to predict the evolution of atmospheric circulations, making water availability projections uncertain and thus hampering adaptation strategies by policy makers. The Holocene epoch has been extensively studied to refine our understanding of climate and test the efficiency of climate models and proxies. And yet, mismatches among proxies and models leave the issue of the mechanisms and evolution of the westerlies still unresolved. In this fellowship, we will address this issue by studying the Holocene sediments recovered from the deep Dead Sea. The deep Dead Sea temperature is mainly influenced by winter air temperature and its level depends on the Jordan discharge that is fueled by winter rainfall, making this site ideal to reconstruct the winter variables affected by the westerlies. We will use novel methods based on spectroscopy and spectrometry on salt fluid inclusions (FIs) to reconstruct Holocene lake temperature and composition and we will develop a new method exploiting the lake composition, thickness of deposited salt, speed of sound in FIs, sediments microfacies and X-ray fluorescence elemental composition to reconstruct lake levels. As, in these arid latitudes, it has been impossible so far to obtain Holocene winter temperatures and hydrological reconstructions are scant, and because this site responds in an unusual way to changes in westerlies, I believe this action will prove key in understanding the evolution of the westerlies.
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MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinador
14473 POTSDAM
Alemania