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Glacier Fluctuations on Mount Kenya since~6000 Cal.Years BP:Implications for Holocene Climatic Change in Africa

Wibjorn Karlen,James L. Fastook,Karin Holmgren,Maria Malmstrom,John A. Matthews, Eric Odada,Jan Risberg,Gunhild Rosqvist,Per Sandgren, Aldo Shemesh,Lars-Ove Westerber'g  
Radiocarbon-dated lacustrine sedimentary evidence indicates that glaciers ot variable size occupied the southwestern cirques on Mount Kenya during much of the last 6000 years. Pro-glacial lacustrine sediments obtained from Hausberg Tam reveal distinct variations in rock-flour content whereas the sediments in Oblong Tam, a nearby non-pro-glacial lake of similar size and appearance to Hausberg Tam show no such variations. The lamination is therefore likely to be directly related to erosion by the glaciers draining into the upper lake in Hausberg Valley. Six major periods of glacier advances have been dated to shortly before-5700, 4500-3900, 3500-3300, 3200-2300, 1300-1200, and 600-400 cal years BP. Radiocarbon dating of the bottom sediments from both Naro Moru and Hausberg Tam, is consistent with a marked glacier expansion that occurred shortly before 5700 cal. years BP. This advance reached approximately 1 km farther downvalley compared with the advances of the Little Ice Age. Modelling of the climate conditions required for this mid-Holocene Mount Kenya advance shows that a lowering of the equilibrium line altitude (ELA) by 100 m for a few hundred years could cause a glacier advance of the inferred magnitude. The glacier advances are attributed primarily to changes in temperature because several independent paleoclimatic studies from East Africa and other areas affected by the Indian monsoon indicate a relatively dry climate at times of glacier advance on Mount Kenya.
【CateGory Index】: P467
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【Co-citations】
Chinese Journal Full-text Database 6 Hits
1 LIU Xingqi1), WANG Yongbo1,2), SHEN Ji1), WANG Sumin1), YANG Bo3)1) Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, Jiangsu, 2100082) Graduate School, Chinese Academy of Sciences, Beijing, 1000393) Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai, 810008;Evolution of Chaka Salt Lake during the Last 16000 Years and Its Response to Climatic Change[J];Acta Geologica Sinica;2007-06
2 XIAO Xia-yun 1) ,SHEN Ji 1) ,WANG Su-min 1) ,XIAO Hai-feng 2) and TONG Guo-bang 3) 1) State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,CAS,Nanjing 210008;2) Department of Geography,Haerbin Normal University,Haerbin 150084;3) Institute of Hydrogeology and Engineering Geology,Chinese Academy of Geological Sciences,Zhengding 050803;CLIMATIC CHANGE AND EVOLUTION OF THE SOUTHWEST MONSOON REVEALED BY POLLEN RECORDS IN THE HEQING DEEP DRILLING CORE[J];Acta Palaeontologica Sinica;2009-02
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4 WANG ShaoWu, HUANG JianBin, WEN XinYu & ZHU JinHong Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871, China;Evidence and modeling study of droughts in China during 4―2 ka BP[J];科学通报(英文版);2008-14
5 ;Holocene Climate[J];Advances in Climate Change Research;2009-04
6 Jianbin Huang~a Shaowu Wang~a Xinyu Wen~a Bao Yang~b a Department of Atmospheric Sciences,School of Physics,Peking University,Beijing 100871,China b Laboratory for Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;Progress in studies of the climate of humid period and the impacts of changing precession in early-mid Holocene[J];自然科学进展(英文版);2008-12
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