DOI: 10.1016/j.quascirev.2013.12.025
Scopus记录号: 2-s2.0-84892872623
论文题名: A deglacial and Holocene record of climate variability in south-central Alaska from stable oxygen isotopes and plant macrofossils in peat
作者: Jones M.C. ; Wooller M. ; Peteet D.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 87 起始页码: 1
结束页码: 11
语种: 英语
英文关键词: Aleutian Low
; Carbon
; Holocene
; Oxygen isotopes
; Peat
Scopus关键词: Aleutian low
; Atmospheric circulation
; Climate variability
; Holocene thermal maximums
; Holocenes
; Oxygen isotopes
; Stable oxygen isotopes
; Summer precipitation
; Carbon
; Climatology
; Isotopes
; Oxygen
; Wetlands
; Peat
; climate variation
; deglaciation
; fossil record
; geoaccumulation
; Holocene
; lacustrine deposit
; oxygen isotope
; peat
; plant
; reconstruction
; seasonality
; timescale
; Alaska
; United States
英文摘要: We used stable oxygen isotopes derived from bulk peat (δ18OTOM), in conjunction with plant macrofossils and previously published carbon accumulation records, in a ~14,500cal yr BP peat core (HT Fen) from the Kenai lowlands in south-central Alaska to reconstruct the climate history of the area. We find that patterns are broadly consistent with those from lacustrine records across the region, and agree with the interpretation that major shifts in δ18OTOM values indicate changes in strength and position of the Aleutian Low (AL), a semi-permanent low-pressure cell that delivers winter moisture to the region. We find decreased strength or a more westerly position of the AL (relatively higher δ18OTOM values) during the Bølling-Allerød, Holocene Thermal Maximum (HTM), and late Holocene, which also correspond to warmer climate regimes. These intervals coincide with greater peat preservation and enhanced carbon (C) accumulation rates at the HT Fen and with peatland expansion across Alaska. The HTM in particular may have experienced greater summer precipitation as a result of an enhanced Pacific subtropical high, a pattern consistent with modern δ18O values for summer precipitation. The combined warm summer temperatures and greater summer precipitation helped promote the observed rapid peat accumulation. A strengthened AL (relatively lower δ18OTOM values) is most evident during the Younger Dryas, Neoglaciation, and the Little Ice Age, consistent with lower peat preservation and C accumulation at the HT Fen, suggesting less precipitation reaches the leeward side of the Kenai Mountains during periods of enhanced AL strength. The peatlands on the Kenai Peninsula thrive when the AL is weak and the contribution of summer precipitation is higher, highlighting the importance of precipitation seasonality in promoting peat accumulation. This study demonstrates that δ18OTOM values in peat can be applied toward understand large-scale shifts in atmospheric circulation over millennial timescales. © 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60370
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: U.S. Geological Survey, National Center, Reston, VA 20192, United States; Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Alaska Stable Isotope Facility, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Alaska Quaternary Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Goddard Institute for Space Studies, New York, NY 20025, United States; Lamont Doherty Earth Observatory, Palisades, NY 10964, United States
Recommended Citation:
Jones M.C.,Wooller M.,Peteet D.M.. A deglacial and Holocene record of climate variability in south-central Alaska from stable oxygen isotopes and plant macrofossils in peat[J]. Quaternary Science Reviews,2014-01-01,87