期刊
QUATERNARY RESEARCH
卷 78, 期 1, 页码 1-12出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1016/j.yqres.2012.03.003
关键词
Paleoflood; Flood intensity; Last millennium; Mediterranean climate; Solar activity; North Atlantic Oscillation
资金
- Assemblee des Pays de Savoie and the Communaute de Communes du Gresivaudan
- French National Research Agency's Pygmalion project [ANR BLAN07-2_204489]
Investigation of Lake Allos sediments revealed similar to 160 graded layers, interpreted as flood deposits, over the last 1400 yr. Comparisons with records of historic floods support the interpretation of flood deposits and suggest that most recorded flood events are the result of intense meso-scale precipitation events. As there is no evidence for any major changes in erosion processes in the catchment since the Medieval Warm Period (MWP), we interpret the Allos record in terms of repeated intense precipitation events over the last millennium, with a low flood frequency during the MWP and more frequent and more intense events during the Little Ice Age. This interpretation is consistent with the pattern of increasingly humid conditions in the northwestern Mediterranean region. This long-term trend is superimposed on high frequency oscillations that correlate with solar activity and autumnal North Atlantic Oscillation (NAO). Finally, a comparison of flood records across the northwestern Mediterranean region showed that intense precipitation events in Allos (east of the Rhone Valley) were out of phase with events in the Cevennes (west of the Rhone) but in phase with events in eastern Spain. Supported by meteorological analyses, this suggests an oscillation in atmospheric circulation patterns over the northwestern Mediterranean. (C) 2012 University of Washington. Published by Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据