DOI: 10.5194/cp-9-1193-2013
Scopus记录号: 2-s2.0-84880901536
论文题名: Orbital changes, variation in solar activity and increased anthropogenic activities: Controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy
作者: Vannière B. ; Magny M. ; Joannin S. ; Simonneau A. ; Wirth S.B. ; Hamann Y. ; Chapron E. ; Gilli A. ; Desmet M. ; Anselmetti F.S.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 3 起始页码: 1193
结束页码: 1209
语种: 英语
Scopus关键词: Bronze Age
; climate variation
; flood control
; Holocene
; human activity
; lacustrine deposit
; Little Ice Age
; oscillation
; photography
; pollen
; solar activity
; Italy
; Lake Ledro
; Trentino-Alto Adige
; Trento
英文摘要: Two lacustrine sediment cores from Lake Ledro in northern Italy were studied to produce chronologies of flood events for the past 10 000 yr. For this purpose, we have developed an automatic method that objectively identifies the sedimentary imprint of river floods in the downstream lake basin. The method was based on colour data extracted from processed core photographs, and the count data were analysed to capture the flood signal. Flood frequency and reconstructed sedimentary dynamics were compared with lakelevel changes and pollen inferred vegetation dynamics. The results suggest a record marked by low flood frequency during the early and middle Holocene (10 000-4500 cal BP). Only modest increases during short intervals are recorded at ca. 8000, 7500, and 7100 cal BP. After 4500-4000 cal BP, the record shows a shift toward increased flood frequency. With the exception of two short intervals around 2900-2500 and 1800-1400 cal BP, which show a slightly reduced number of floods, the trend of increasing flood frequency prevailed until the 20th century, reaching a maximum between the 16th and the 19th centuries. Brief-flood frequency increases recorded during the early and middle Holocene can be attributed to cold climatic oscillations. On a centennial time scale, major changes in flood frequency, such as those observed after ca. 4500/4000 and 500 cal BP, can be attributed to large-scale climatic changes such as the Neo-glacial and Little Ice Age, which are under orbital and possibly solar control. However, in the Bronze Age and during the Middle Ages and modern times, forest clearing and land use probably partially control the flood activity. © Author(s) 2013. 资助项目: SNSF, Swiss National Science Foundation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49391
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Vannière B.,Magny M.,Joannin S.,et al. Orbital changes, variation in solar activity and increased anthropogenic activities: Controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy[J]. Climate of the Past,2013-01-01,9(3)