干旱区生态环境知识资源中心(Arid): Determining the Pace and Magnitude of Lake Level Changes in Southern Ethiopia Over the Last 20,000 Years Using Lake Balance Modeling and SEBAL

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DOI	10.3389/feart.2020.00197
	Determining the Pace and Magnitude of Lake Level Changes in Southern Ethiopia Over the Last 20,000 Years Using Lake Balance Modeling and SEBAL
	Fischer, Markus L.; Markowska, Monika; Bachofer, Felix; Foerster, Verena E.; Asrat, Asfawossen; Zielhofer, Christoph; Trauth, Martin H.; Junginger, Annett
通讯作者	Fischer, ML (corresponding author), Eberhard Karis Univ Tubingen, Dept Geosci, Tubingen, Germany. ; Fischer, ML (corresponding author), Senckenberg Ctr Human Evolut & Paleoenvironm S HE, Tubingen, Germany.
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2020
卷号	8
英文摘要	The Ethiopian rift is known for its diverse landscape, ranging from arid and semi-arid savannahs to high and humid mountainous regions. Lacustrine sediments and paleo-shorelines indicate water availability fluctuated dramatically from deep fresh water lakes, to shallow highly alkaline lakes, to completely desiccated lakes. To investigate the role lakes have played through time as readily available water sources to humans, an enhanced knowledge of the pace, character and magnitude of these changes is essential. Hydro-balance models are used to calculate paleo-precipitation rates and the potential pace of lake level changes. However, previous models did not consider changes in hydrological connectivity during humid periods in the rift system, which may have led to an overestimation of paleo-precipitation rates. Here we present a comprehensive hydro-balance modeling approach that simulates multiple rift lakes from the southern Ethiopian Rift (lakes Abaya, Chamo, and paleo-lake Chew Bahir) simultaneously, considering their temporal hydrological connectivity during high stands of the African Humid Period (AHP, similar to 15-5 ka). We further used the Surface Energy Balance Algorithm for Land (SEBAL) to calculate the evaporation of paleo-lake Chew Bahir's catchment. We also considered the possibility of an additional rainy season during the AHP as previously suggested by numerous studies. The results suggest that an increase in precipitation of 20-30% throughout the southern Ethiopian Rift is necessary to fill paleo-lake Chew Bahir to its overflow level. Furthermore, it was demonstrated that paleo-lake Chew Bahir was highly dependent on the water supply from the upper lakes Abaya and Chamo and dries out within similar to 40 years if the hydrological connection is cut off and the precipitation amount decreases to present day conditions. Several of such rapid lake level fluctuations, from a freshwater to a saline lake, might have occurred during the termination of the AHP, when humid conditions were less stable. Fast changes in fresh water availability requires high adaptability for humans living in the area and might have exerted severe environmental stress on humans in a sub-generational timescale.
英文关键词	African humid period precipitation changes abrupt and gradual changes Chew Bahir Lake Abaya Lake Chamo human-environment interaction
类型	Article
语种	英语
开放获取类型	gold, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000619870300001
WOS关键词	AFRICAN HUMID PERIOD ; HOLOCENE CLIMATE-CHANGE ; NORTHERN KENYA ; LATE PLEISTOCENE ; ENERGY-BALANCE ; MAPPING EVAPOTRANSPIRATION ; RAINFALL VARIABILITY ; BALE MOUNTAINS ; RECORD ; BASIN
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369177
作者单位	[Fischer, Markus L.; Markowska, Monika; Junginger, Annett] Eberhard Karis Univ Tubingen, Dept Geosci, Tubingen, Germany; [Fischer, Markus L.; Junginger, Annett] Senckenberg Ctr Human Evolut & Paleoenvironm S HE, Tubingen, Germany; [Markowska, Monika] Max Planck Inst Chem, Dept Climate Geochem, Mainz, Germany; [Bachofer, Felix] German Aerosp Ctr DLR, Earth Observat Ctr, Wessling, Germany; [Foerster, Verena E.] Univ Cologne, Inst Geog Educ, Cologne, Germany; [Asrat, Asfawossen] Addis Ababa Univ, Sch Earth Sci, Addis Ababa, Ethiopia; [Zielhofer, Christoph] Univ Leipzig, Inst Geog, Leipzig, Germany; [Trauth, Martin H.] Univ Potsdam, Inst Geosci, Potsdam, Germany
推荐引用方式 GB/T 7714	Fischer, Markus L.,Markowska, Monika,Bachofer, Felix,et al. Determining the Pace and Magnitude of Lake Level Changes in Southern Ethiopia Over the Last 20,000 Years Using Lake Balance Modeling and SEBAL[J],2020,8.
APA	Fischer, Markus L..,Markowska, Monika.,Bachofer, Felix.,Foerster, Verena E..,Asrat, Asfawossen.,...&Junginger, Annett.(2020).Determining the Pace and Magnitude of Lake Level Changes in Southern Ethiopia Over the Last 20,000 Years Using Lake Balance Modeling and SEBAL.FRONTIERS IN EARTH SCIENCE,8.
MLA	Fischer, Markus L.,et al."Determining the Pace and Magnitude of Lake Level Changes in Southern Ethiopia Over the Last 20,000 Years Using Lake Balance Modeling and SEBAL".FRONTIERS IN EARTH SCIENCE 8(2020).