DOI: 10.5194/cp-10-1843-2014
Scopus记录号: 2-s2.0-84908086101
论文题名: Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 280 000 years
作者: Ajioka T. ; Yamamoto M. ; Takemura K. ; Hayashida A. ; Kitagawa H.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 5 起始页码: 1843
结束页码: 1855
语种: 英语
Scopus关键词: air temperature
; borehole
; eccentricity
; ether
; ion exchange
; lacustrine deposit
; pH
; phosphorus
; pollen
; precipitation assessment
; pump
; timescale
; water temperature
; Biwa Lake
; Honshu
; Japan
; Kinki
; Shiga
英文摘要: We generated a 280 000 yr record of water pH and temperature in Lake Biwa, central Japan, by analysing the methylation index (MBT′) and cyclisation ratio (CBT) of branched tetraethers in sediments from piston and borehole cores. Our aim was to understand the responses of precipitation and air temperature in central Japan to the East Asian monsoon variability on orbital timescales. Because the water pH in Lake Biwa is determined by phosphorus and alkali cation inputs, the record of water pH should indicate the changes in precipitation and temperature in central Japan. Comparison with a pollen assemblage in a Lake Biwa core suggests that lake water pH was determined by summer temperature in the low-eccentricity period before 55 ka, while it was determined by summer precipitation in the high-eccentricity period after 55 ka. From 130 to 55 ka, the variation in lake pH (summer precipitation) lagged behind that in summer temperature by several thousand years. This perspective is consistent with the conclusions of previous studies (Igarashi and Oba, 2006; Yamamoto, 2009), in that the temperature variation preceded the precipitation variation in central Japan. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49215
Appears in Collections: 气候变化与战略
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Recommended Citation:
Ajioka T.,Yamamoto M.,Takemura K.,et al. Water pH and temperature in Lake Biwa from MBT'/CBT indices during the last 280 000 years[J]. Climate of the Past,2014-01-01,10(5)