DOI: 10.1016/j.quascirev.2012.10.040
Scopus记录号: 2-s2.0-84878937235
论文题名: Mechanisms of lake-level change at Laguna Potrok Aike (Argentina) - insights from hydrological balance calculations
作者: Ohlendorf C. ; Fey M. ; Gebhardt C. ; Haberzettl T. ; Lücke A. ; Mayr C. ; Schäbitz F. ; Wille M. ; Zolitschka B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 71 起始页码: 27
结束页码: 45
语种: 英语
英文关键词: Carbonate precipitation
; Groundwater
; ICDP-project PASADO
; Monitoring
; Scenario calculations
; Sediment traps
; Southern Hemisphere Westerlies
Scopus关键词: Authigenic carbonates
; Carbonate precipitation
; Coupled general circulation models
; ICDP-project PASADO
; Meteorological parameters
; Southern Hemisphere
; Southern hemisphere annular modes
; Southern south america
; Atmospheric pressure
; Carbonation
; Catchments
; Climatology
; Digital storage
; Groundwater
; Lasers
; Monitoring
; Runoff
; Sediment traps
; Sedimentology
; Lakes
; carbonate
; energy budget
; environmental monitoring
; evaporation
; general circulation model
; hydrochemistry
; hydrological change
; lacustrine environment
; mathematical analysis
; permafrost
; precipitation (chemistry)
; sediment chemistry
; sediment trap
; Southern Hemisphere
; timescale
; volume
; wind velocity
; Argentina
; Laguna Potrok Aike
; Santa Cruz [Argentina]
英文摘要: Laguna Potrok Aike is an exceptional site in the southern hemisphere's mid-latitudes because it records changes in the hydrological regime through lake-level variations in a continuous, high-resolution sediment record back into the late Pleistocene. In this study, driving forces of lake-level changes at Laguna Potrok Aike are evaluated by means of process studies using data from an extensive multi-year monitoring in and around the lake. Lake-volume changes were calculated with an energy-budget/bulk-transfer approach and translated into lake-level variations, which were then compared to pressure sensor data. Calculated lake levels are in broad agreement with measured data. We hypothesize that on short time scales, lake-level fluctuations are mainly driven by the precipitation-to-evaporation ratio. Apart from changing catchment conditions, relative humidity, precipitation, temperature, wind strength and wind direction have the most important influence on the hydrological balance of the lake. Lake level decreases during periods of persistently high wind speeds from westerly directions, whereas, during periods with more frequent occurrences of easterly winds, it increases. These situations are linked to a strengthening of the Southern Hemispheric Westerlies in the first and more frequent blocking situations in the latter case. Although lake-level changes at Laguna Potrok Aike show some degree of similarity to variations of the El Niño Southern Oscillation (ENSO) and the Southern Hemisphere Annular Mode (SAM), a persistent correspondence remains to be documented.Water chemistry and sediment-trap data suggest that lake-internal carbonate precipitation is highly sensitive to short-term changes in the lake water volume and, thus, to lake-level variations. However, it becomes obvious that the sedimentary carbonate record, representing changes on longer time scales, is not linearly linked to lake-level changes, hence complicating quantitative lake-level reconstructions back in time. We suggest that short-term changes in authigenic carbonate production are mainly driven by changing precipitation/evaporation ratios probably superimposed on longer-term changes in groundwater input that represent a buffered climate signal.Scenario calculations for a period of 60 years show that changes of the controlling meteorological parameters in the range of 15-17% can lead to lake-level changes with a magnitude comparable to the reconstructed Holocene and Lateglacial extreme situations. In addition, modifications in the water-retaining capacity of the lake can also produce large lake-level changes. It is hypothesized that the development or disappearance of permafrost in the catchment of Laguna Potrok Aike during the Last Glacial/Interglacial transition may have changed the water-retaining capacity tremendously. The lake-level reconstructions for Laguna Potrok Aike might express some of the meridional climate variability observed in coupled general circulation model (CGCM) simulations for southern South America for the Last Glacial Maximum (LGM) and the mid Holocene. © 2012 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60613
Appears in Collections: 过去全球变化的重建
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作者单位: GEOPOLAR, Institute of Geography, University of Bremen, Celsiusstr. FVG-M, D-28359 Bremen, Germany; Alfred Wegener Institute of Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany; Physical Geography, Institute of Geography, University of Jena, Löbdergraben 32, D-07743 Jena, Germany; Institute of Bio- and Geosciences, Research Center Jülich, IBG-3: Agrosphere, D-52425 Jülich, Germany; Institute of Geography, University of Erlangen-Nuremberg, Kochstr. 4/4, D-91054 Erlangen, Germany; Institute of Paleontology and Geobiology, GeoBio-Center, University of Munich, Richard-Wagner-Str. 10, D-80333 Munich, Germany; Seminar für Geographie und ihre Didaktik, University of Cologne, Gronewaldstr. 2, D-50931 Cologne, Germany
Recommended Citation:
Ohlendorf C.,Fey M.,Gebhardt C.,et al. Mechanisms of lake-level change at Laguna Potrok Aike (Argentina) - insights from hydrological balance calculations[J]. Quaternary Science Reviews,2013-01-01,71