DOI: 10.5194/cp-11-1139-2015
Scopus记录号: 2-s2.0-84941661350
论文题名: Multi-century lake area changes in the Southern Altiplano: A tree-ring-based reconstruction
作者: Morales M.S. ; Carilla J. ; Grau H.R. ; Villalba R.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 9 起始页码: 1139
结束页码: 1152
语种: 英语
Scopus关键词: annual variation
; biodiversity
; dendrochronology
; lacustrine environment
; Landsat
; paleoenvironment
; paleohydrology
; paleolimnology
; proxy climate record
; reconstruction
; shrub
; spatiotemporal analysis
; tree ring
; Altiplano
; Andes
; Argentina
; Bolivia
英文摘要: Size fluctuations in endorheic lakes in northwestern Argentina (NWA) and southwestern Bolivia (SWB) are very sensitive to basin hydrological balances, and consequently, very vulnerable to deleterious effects from climatic changes. The management of these water resources and their biodiversity requires a comprehensive knowledge of their natural variability over multiple timescales. In this study, we present a multi-century reconstruction of past lake-area fluctuations in NWA and SWB. The evidence used to develop and validate this reconstruction includes satellite images and a century-long tree-ring record from P. tarapacana. Inter-annual fluctuations in lake area of nine lakes were quantified based on Landsat satellite images over the period 1975 to 2009. A regional P. tarapacana tree-ring chronology, composite from two sampling sites, was used as predictors in a regression model to reconstruct the mean annual (January-December) lake area from the nine lakes. The reconstruction model captures 62 % of the total variance in lake-area fluctuations and shows adequate levels of cross-validation. This high-resolution reconstruction covers the past 601 years and characterizes the occurrence of annual to multi-decadal lake area fluctuations and its main oscillation modes of variability. Our reconstruction points out that the late 20th century decrease in lake area was exceptional over the period 1407-2007; a persistent negative trend in lake area is clear in the reconstruction and consistent with glacier retreat and other climate proxies from the Altiplano and the tropical Andes. Since the mid 1970s, the Vilama-Coruto lake system recorded an accelerated decrease in area consistent with an increasing recurrence of extremely small lake-area events. Throughout the 601 years, the reconstruction provides valuable information about spatial and temporal stabilities of the relationships between changes in lake area, ENSO, and PDO, highlighting the Pacific influence over most modes of lake area variability. Global and regional climate models for the Altiplano project a marked reduction in precipitation to the end of the 21st century, exacerbating presently dry conditions. These results provide a baseline for the historical range of variability in lake fluctuations and thus should be considered for the management of biodiversity and water resources in the Central Andes during the next decades. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49121
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Morales M.S.,Carilla J.,Grau H.R.,et al. Multi-century lake area changes in the Southern Altiplano: A tree-ring-based reconstruction[J]. Climate of the Past,2015-01-01,11(9)