干旱区生态环境知识资源中心(Arid): Climate, vegetation and fire history during the past 18,000 years, recorded in high altitude lacustrine sediments on the Sanetti Plateau, Bale Mountains (Ethiopia)

Arid

DOI	10.1186/s40645-022-00472-9
	Climate, vegetation and fire history during the past 18,000 years, recorded in high altitude lacustrine sediments on the Sanetti Plateau, Bale Mountains (Ethiopia)
	Mekonnen, Betelhem; Glaser, Bruno; Zech, Roland; Zech, Michael; Schluetz, Frank; Bussert, Robert; Addis, Agerie; Gil-Romera, Graciela; Nemomissa, Sileshi; Bekele, Tamrat; Bittner, Lucas; Solomon, Dawit; Manhart, Andreas; Zech, Wolfgang
通讯作者	Mekonnen, B (corresponding author)，Martin Luther Univ Halle Wittenberg, Inst Agr & Nutr Sci, Soil Biogeochem, Halle, Germany. ; Mekonnen, B (corresponding author)，Misrak Polytech Coll, Dept Urban Agr, Addis Ababa, Ethiopia.
来源期刊	PROGRESS IN EARTH AND PLANETARY SCIENCE
ISSN	2197-4284
出版年	2022
卷号	9 期号:1
英文摘要	Low-altitude lakes in eastern Africa have long been investigated and have provided valuable information about the Late Quaternary paleohydrological evolution, such as the African Humid Period. However, records often suffer from poor age control, resolution, and/or ambiguous proxy interpretation, and only little focus has been put on high-altitude regions despite their sensitivity to global, regional, and local climate change phenomena. Here we report on Last Glacial environmental fluctuations at about 4000 m asl on the Sanetti Plateau in the Bale Mountains (SE Ethiopia), based on biogeochemical and palynological analyses of laminated lacustrine sediments. After deglaciation at about 18 cal kyr BP, a steppe-like herb-rich grassland with maximum Chenopodiaceae/Amaranthaceae and Plantago existed. Between 16.6 and 15.7 cal kyr BP, conditions were dry with a desiccation layer at similar to 16.3 cal kyr BP, documenting a temporary phase of maximum aridity on the plateau. While that local event lasted for only a few decades, concentrations of various elements (e.g. Zr, HF, Nb, Nd, and Na) started to increase and reached a maximum at similar to 15.8-15.7 cal kyr BP. We interpret those elements to reflect allochthonous, aeolian dust input via dry northerly winds and increasingly arid conditions in the lowlands. We suggest an abrupt versus delayed response at high and low altitudes, respectively, in response to Northern Hemispheric cooling events (the Heinrich Event 1). The delayed response at low altitudes might be caused by slow negative vegetation and monsoon feedbacks that make the ecosystem somewhat resilient. At similar to 15.7 cal kyr BP, our record shows an abrupt onset of the African Humid Period, almost 1000 years before the onset of the Bolling-Allerod warming in the North-Atlantic region, and about 300 years earlier than in the Lake Tana region. Erica pollen increased significantly between 14.4 and 13.6 cal kyr BP in agreement with periodically wet and regionally warm conditions. Similarly, intense fire events, documented by increased black carbon, correlate with wet and warm environmental conditions that promote the growth of Erica shrubs. This allows to conclude that biomass and thus fuel availability is one important factor controlling fire events in the Bale Mountains.
英文关键词	Bale Mountains High-altitude lacustrine sediments Heinrich event 1 African humid period Fire Erica
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000761950200001
WOS关键词	LATE PLEISTOCENE ; BLACK CARBON ; LAKE TANA ; QUATERNARY GLACIATION ; HYDROLOGICAL CHANGES ; NORTHERN-HEMISPHERE ; HOLOCENE ; AFRICA ; POLLEN ; RECONSTRUCTION
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/2XILL650/376271
作者单位	[Mekonnen, Betelhem; Glaser, Bruno; Zech, Michael; Bittner, Lucas] Martin Luther Univ Halle Wittenberg, Inst Agr & Nutr Sci, Soil Biogeochem, Halle, Germany; [Mekonnen, Betelhem] Misrak Polytech Coll, Dept Urban Agr, Addis Ababa, Ethiopia; [Zech, Roland] Friedrich Schiller Univ Jena, Inst Geog, Jena, Germany; [Zech, Michael; Bittner, Lucas] Tech Univ Dresden, Inst Geog, Dresden, Germany; [Schluetz, Frank] Lower Saxony Inst Hist Coastal Res, Wilhelmshaven, Germany; [Schluetz, Frank] Gottingen Univ, Albrecht Haller Inst Plant Sci, Dept Palynol & Climate Dynam, Gottingen, Germany; [Bussert, Robert] TU Berlin, Inst Appl Geosci, Berlin, Germany; [Addis, Agerie] Jigjiga Univ, Dept Nat Resource Management, Jigjiga, Ethiopia; [Gil-Romera, Graciela] CSIC, Pyrenean Inst Ecol, Dept Geoenvironm Proc & Global Change, Zaragoza, Spain; [Nemomissa, Sileshi; Bekele, Tamrat] Addis Ababa Univ, Dept Plant Biol & Biodivers Management, Addis Ababa, Ethiopia; [Solomon, Dawit] Int Livestock Res Inst, Addis Ababa, Ethiopia; [Manh...
推荐引用方式 GB/T 7714	Mekonnen, Betelhem,Glaser, Bruno,Zech, Roland,et al. Climate, vegetation and fire history during the past 18,000 years, recorded in high altitude lacustrine sediments on the Sanetti Plateau, Bale Mountains (Ethiopia)[J],2022,9(1).
APA	Mekonnen, Betelhem.,Glaser, Bruno.,Zech, Roland.,Zech, Michael.,Schluetz, Frank.,...&Zech, Wolfgang.(2022).Climate, vegetation and fire history during the past 18,000 years, recorded in high altitude lacustrine sediments on the Sanetti Plateau, Bale Mountains (Ethiopia).PROGRESS IN EARTH AND PLANETARY SCIENCE,9(1).
MLA	Mekonnen, Betelhem,et al."Climate, vegetation and fire history during the past 18,000 years, recorded in high altitude lacustrine sediments on the Sanetti Plateau, Bale Mountains (Ethiopia)".PROGRESS IN EARTH AND PLANETARY SCIENCE 9.1(2022).