globalchange  > 气候减缓与适应
DOI: 10.1016/j.quascirev.2018.02.015
Scopus记录号: 2-s2.0-85042914844
论文题名:
The timing, two-pulsed nature, and variable climatic expression of the 4.2 ka event: A review and new high-resolution stalagmite data from Namibia
作者: Railsback L.B.; Liang F.; Brook G.A.; Voarintsoa N.R.G.; Sletten H.R.; Marais E.; Hardt B.; Cheng H.; Edwards R.L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 186
起始页码: 78
结束页码: 90
语种: 英语
英文关键词: 4.2 ka event ; Africa ; Holocene ; Inter-tropical convergence zone ; Namibia ; Paleoclimate ; Paleoclimatology ; Speleothems ; Stalagmite
Scopus关键词: Drought ; Isotopes ; Precipitation (meteorology) ; Rain ; Timing circuits ; 4.2 ka event ; Africa ; Holocenes ; Intertropical convergence zone ; Namibia ; Paleoclimates ; Paleoclimatology ; Speleothems ; Stalagmite ; Uncertainty analysis ; dissolution ; drought ; Holocene ; intertropical convergence zone ; literature review ; new record ; paleoclimate ; petrography ; speleothem ; stalagmite ; Namibia
英文摘要: The climatic event between 4.2 and 3.9 ka BP known as the “4.2 ka event” is commonly considered to be a synchronous global drought that happened as one pulse. However, careful comparison of records from around the world shows that synchrony is possible only if the published chronologies of the various records are shifted to the extent allowed by the uncertainties of their age data, that several records suggest a two-pulsed event, and that some records suggest a wet rather than dry event. The radiometric ages constraining those records have uncertainties of several decades if not hundreds of years, and in some records the event is represented by only one or two analyses. This paper reports a new record from Stalagmite DP1 from northeastern Namibia in which high 230Th/232Th activity ratios allow small age uncertainties ranging between only 10–28 years, and the event is documented by more than 35 isotopic analyses and by petrographic observation of a surface of dissolution. The ages from Stalagmite DP1 combine with results from 11 other records from around the world to suggest an event centered at about 4.07 ka BP with bracketing ages of 4.15 to 3.93 ka BP. The isotopic and petrographic results suggest a two-pulsed wet event in northeastern Namibia, which is in the Southern Hemisphere's summer rainfall zone where more rain presumably fell with southward migration of the Inter-Tropical Convergence Zone as the result of cooling in the Northern Hemisphere. Comparison with other records from outside the region of dryness from the Mediterranean to eastern Asia suggests that multiple climatic zones similarly moved southward during the event, in some cases bringing wetter conditions that contradict the notion of global drought. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112249
Appears in Collections:气候减缓与适应

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作者单位: Department of Geology, University of Georgia, Athens, GA 30602, United States; Department of Geography, Western Illinois University, 1 University Circle, Macomb, IL 61455, United States; Department of Geography, University of Georgia, Athens, GA 30602, United States; Gobabeb Research and Training Centre, P.O. Box 953, Walvis Bay, Namibia; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, United States; College of Global Environmental Change, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China; Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, United States; Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem, Israel; Shell Exploration and Production Company, Houston, Texas 77079, United States

Recommended Citation:
Railsback L.B.,Liang F.,Brook G.A.,et al. The timing, two-pulsed nature, and variable climatic expression of the 4.2 ka event: A review and new high-resolution stalagmite data from Namibia[J]. Quaternary Science Reviews,2018-01-01,186
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