DOI: 10.1016/j.quascirev.2017.06.023
Scopus记录号: 2-s2.0-85021391080
论文题名: Ocean-atmosphere interactions as drivers of mid-to-late Holocene rapid climate changes: Evidence from high-resolution stalagmite records at DeSoto Caverns, Southeast USA
作者: Aharon P. ; Dhungana R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 170 起始页码: 69
结束页码: 81
语种: 英语
英文关键词: Atlantic multi decadal oscillation
; Cave monitoring
; Gulf Coast
; Holocene
; Hydroclimate
; Paleoclimatology
; Rainfall seasonality
; Speleothems
; Stable isotopes
; U-Th series
Scopus关键词: Binary alloys
; Carbon
; Caves
; Climate models
; Cultivation
; Drought
; Isotopes
; Rain
; Atlantic multi decadal oscillation
; Gulf coast
; Holocenes
; Hydroclimate
; Paleoclimatology
; Seasonality
; Speleothems
; Stable isotopes
; Climate change
英文摘要: Oxygen and carbon isotope time-series derived from an actively growing aragonitic stalagmite in DeSoto Caverns exhibit with unusual clarity rapid hydroclimate changes in the mid-to-late Holocene. Data consist of 1884 δ18O and δ13C determinations whose chronology is anchored on 35 230Th/234U absolute dates in the interval 6.0–1.1 cal ka BP. Exceptional 18O and 13C-enrichments centered at 4.8 ± 0.14 cal ka BP likely represent the imprints of a severe drought. Isotope cycles from 4.7 to 1.3 cal ka BP, exhibit a dominant periodicity of 68 ± 4 yrs. A gradual cooling trend of ∼0.6 °C/103 yrs is attributed to a declining seasonal contrast in insolation. The synchronicity of the mega-drought in the Southeast US with the (1) termination of the African Humid Period; (ii) abrupt reduction of the North Atlantic Deep Water production, and (iii) rapid sea-ice expansion in the polar regions of both Hemispheres testifies to the global extent and rapidity of the “5 ka” event and points to the North Atlantic Deep Water variability as the likely controlling factor. The multidecadal cycles are consistent with alternating dry and wet summers occurring during a long-term switch in the seasonal rainfall amount dominance from winter to summer. The periodic summer droughts in the Southeast US support climate models that predict profound hydroclimate changes in the late Holocene governed by the Atlantic Multidecadal Oscillation. The relatively short and rapid hydroclimate phase transitions documented in this study introduce a complication in the correlation of late Holocene drought events that had significant societal impacts. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59141
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geological Sciences, University of Alabama, Box 870338, Tuscaloosa, AL, United States
Recommended Citation:
Aharon P.,Dhungana R.. Ocean-atmosphere interactions as drivers of mid-to-late Holocene rapid climate changes: Evidence from high-resolution stalagmite records at DeSoto Caverns, Southeast USA[J]. Quaternary Science Reviews,2017-01-01,170