DOI: 10.1016/j.palaeo.2013.04.016
论文题名: A multi-proxy palaeolimnological study to reconstruct the evolution of a coastal brackish lake (Lough Furnace, Ireland) during the late Holocene
作者: Cassina F. ; Dalton C. ; Dillane M. ; de Eyto E. ; Poole R. ; Sparber K.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 383-384 起始页码: 1
结束页码: 15
语种: 英语
英文关键词: C/N
; Diatoms
; Hydrology
; Lagoon
; Late Holocene
; Stable isotope
英文摘要: This study examines the evolution of Lough Furnace, a coastal brackish lake in the west of Ireland, using high-resolution sensors in the water column and palaeolimnological examination of the sediment archive. Palaeoenvironmental reconstructions suggest that meromixis formed as a result of sea level rise prior to ca. 4000. cal.yr BP. Increased seawater inflow has progressively led to permanent water stratification, which caused the onset of anoxia, making the monimolimnion a harsh environment for biological life. Diatom floristic interpretations suggest a progressive upcore increase in salinity, which is paralleled by a reduction in cladocera remains. Diagenetic processes have not altered the sediment organic matter signature. Organic matter mainly derives from freshwater DOC and appears to be linked to the presence of peat bogs in the catchment as confirmed by the C/N ratio. Upcore variations in the C/N ratio with a ca. 800-year periodicity have been interpreted as the result of alternating dry and wet climatic phases during the late Holocene, which appear synchronous with the NAO and long-term solar cycles. The current hydrology is largely controlled by freshwater inflow, which determines permanent meromictic conditions. Overturns are rare, requiring a specific combination of factors such as exceptionally dry and warm summers followed by cool autumns. According to the climate projections for the next century in Ireland, permanent meromictic conditions will probably continue. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69713
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, Mary Immaculate College, University of Limerick, Co. Limerick, Ireland; Marine Institute, Newport, Co. Mayo, Ireland
Recommended Citation:
Cassina F.,Dalton C.,Dillane M.,et al. A multi-proxy palaeolimnological study to reconstruct the evolution of a coastal brackish lake (Lough Furnace, Ireland) during the late Holocene[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,383-384