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Spatial and temporal variability in Mediterranean climate over the last millennium from vermetid isotope records and CMIP5/PMIP3 models
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.gloplacha.2020.103159
Yael Amitai , Ruth Yam , Paolo Montagna , Saverio Devoti , Matthias López Correa , Aldo Shemesh

Abstract Stable isotope compositions of oxygen (δ18O) and carbon (δ13C) of the aragonite skeleton of the reef-building gastropod Dendropoma petreaum provide high-resolution records of the Mediterranean climate over the last millennium. In particular, the isotopic composition of vermetid cores collected from the west and east Mediterranean reveals that the different regions have had distinct thermal and primary production behaviors throughout the last millennium. The rate of warming in the recent Industrial Period is variable among the different regions of the Mediterranean Sea. The δ18O-derived Sea Surface Temperature (SST) anomalies show that the Eastern Mediterranean surface temperature is increasing much more rapidly than in the Western Mediterranean. Additionally, the signals of the Little Ice Age and of the Medieval Climate Anomaly are more apparent in the western and in the central Mediterranean while they are almost absent in the eastern Mediterranean. We aim to reconcile the SST temporal and spatial pattern with the variability of the North Atlantic Oscillation (NAO) and the South Asian Monsoon (SAM) climate systems by analyzing coupled atmosphere-ocean models from the CMIP5/PMIP3 projects that simulate the global climate of the past 1000 years. We show that even though the NAO is more dominant in the western Mediterranean SST, its latitudinal movement, on a centennial time scale, is evident in the eastern Mediterranean SST signal. We also discuss the Atlantic water inflow role in the observed similarities of the surface productivity signals and the Suess effect that prevail the Industrial Period signal in all regions of the Mediterranean.

中文翻译:

来自蚯蚓同位素记录和CMIP5/PMIP3模型的过去千年地中海气候的时空变化

摘要 造礁腹足动物 Dendropoma petreaum 文石骨架的氧 (δ18O) 和碳 (δ13C) 的稳定同位素组成提供了过去千年地中海气候的高分辨率记录。特别是,从西地中海和东地中海收集到的蚯蚓核的同位素组成表明,在过去的千年中,不同地区具有不同的热和初级生产行为。在最近的工业时期,地中海不同地区的变暖速度各不相同。δ18O 衍生的海面温度 (SST) 异常表明东地中海地表温度的上升速度远高于西地中海。此外,小冰期和中世纪气候异常的信号在地中海西部和中部更为明显,而在地中海东部几乎没有。我们的目标是通过分析来自模拟全球气候的 CMIP5/PMIP3 项目的大气-海洋耦合模型,将海温时空格局与北大西洋涛动 (NAO) 和南亚季风 (SAM) 气候系统的变异性相协调。过去的 1000 年。我们表明,尽管 NAO 在西地中海 SST 中占主导地位,但在百年时间尺度上,其纬度运动在东地中海 SST 信号中很明显。
更新日期:2020-06-01
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