DOI: 10.5194/cp-11-217-2015
Scopus记录号: 2-s2.0-84922956106
论文题名: Reconstruction of recent climate change in Alaska from the Aurora Peak ice core, central Alaska
作者: Tsushima A. ; Matoba S. ; Shiraiwa T. ; Okamoto S. ; Sasaki H. ; Solie D.J. ; Yoshikawa K.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 2 起始页码: 217
结束页码: 226
语种: 英语
Scopus关键词: air temperature
; atmospheric chemistry
; climate change
; climate modeling
; hydrogen isotope
; ice core
; precipitation (climatology)
; seasonal variation
; Alaska
; Alaska Range
; Aurora Peak
; Pacific Ocean
; Pacific Ocean (North)
; United States
英文摘要: A 180.17 m ice core was drilled at Aurora Peak in the central part of the Alaska Range, Alaska, in 2008 to allow reconstruction of centennial-scale climate change in the northern North Pacific. The 10 m depth temperature in the borehole was -2.2 °C, which corresponded to the annual mean air temperature at the drilling site. In this ice core, there were many melt-refreeze layers due to high temperature and/or strong insolation during summer seasons. We analyzed stable hydrogen isotopes (δD) and chemical species in the ice core. The ice core age was determined by annual counts of ?D and seasonal cycles of Na+, and we used reference horizons of tritium peaks in 1963 and 1964, major volcanic eruptions of Mount Spurr in 1992 and Mount Katmai in 1912, and a large forest fire in 2004 as age controls. Here, we show that the chronology of the Aurora Peak ice core from 95.61 m to the top corresponds to the period from 1900 to the summer season of 2008, with a dating error of ± 3 years. We estimated that the mean accumulation rate from 1997 to 2007 (except for 2004) was 2.04 m w.eq. yr-1. Our results suggest that temporal variations in δD and annual accumulation rates are strongly related to shifts in the Pacific Decadal Oscillation index (PDOI). The remarkable increase in annual precipitation since the 1970s has likely been the result of enhanced storm activity associated with shifts in the PDOI during winter in the Gulf of Alaska. © Author(s) 2015.
资助项目: JSPS, Japan Society for the Promotion of Science
; JSPS, Japan Society for the Promotion of Science
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49178
Appears in Collections: 气候变化与战略
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Recommended Citation:
Tsushima A.,Matoba S.,Shiraiwa T.,et al. Reconstruction of recent climate change in Alaska from the Aurora Peak ice core, central Alaska[J]. Climate of the Past,2015-01-01,11(2)