DOI: 10.1016/j.gloplacha.2014.04.008
论文题名: Oxygen isotope composition of diatoms as Late Holocene climate proxy at Two-Yurts Lake, Central Kamchatka, Russia
作者: Meyer H. ; Chapligin B. ; Hoff U. ; Nazarova L. ; Diekmann B.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 134 起始页码: 118
结束页码: 128
语种: 英语
英文关键词: Aleutian Low
; Biogenic silica
; Diatom oxygen isotopes
; Holocene
; Palaeoclimate
; Palaeolimnology
Scopus关键词: Algae
; Climate change
; Lakes
; Oxygen
; Phytoplankton
; Sediments
; Silica
; Aleutian low
; Biogenic silica
; Holocenes
; Oxygen isotopes
; Palaeoclimate
; Palaeolimnology
; Isotopes
; atmospheric pressure
; climate variation
; diatom
; Holocene
; isotopic composition
; isotopic fractionation
; lacustrine deposit
; lake water
; oxygen isotope
; paleoclimate
; paleolimnology
; proxy climate record
; silica
; Alaska
; Aleutian Islands
; Kamchatka
; Pacific Ocean
; Russian Federation
; Sea of Okhotsk
; Siberia
; United States
; Bacillariophyta
; Chironomidae
英文摘要: Especially in combination with other proxies, the oxygen isotope composition of diatom silica (δ18Odiatom) from lake sediments is useful for interpreting past climate conditions. This paper presents the first oxygen isotope data of fossil diatoms from Kamchatka, Russia, derived from sediment cores from Two-Yurts Lake (TYL). For reconstructing Late Holocene climate change, palaeolimnological investigations also included diatom, pollen and chironomid analysis. The most recent diatom sample (δ18Odiatom=+23.3‰) corresponds well with the present day isotopic composition of the TYL water (mean δ18O=-14.8‰) displaying a reasonable isotope fractionation in the system silica-water. Nonetheless, the TYL δ18Odiatom record is mainly controlled by changes in the isotopic composition of the lake water. TYL is considered as a dynamic system triggered by differential environmental changes closely linked with lake-internal hydrological factors. The diatom silica isotope record displays large variations in δ18Odiatom from +27.3‰ to +23.3‰ from about ~4.5kyr BP until today. A continuous depletion in δ18Odiatom of 4.0‰ is observed in the past 4.5kyr, which is in good accordance with other hemispheric environmental changes (i.e. a summer insolation-driven Mid- to Late Holocene cooling). The overall cooling trend is superimposed by regional hydrological and atmospheric-oceanic changes. These are related to the interplay between Siberian High and Aleutian Low as well as to the ice dynamics in the Sea of Okhotsk. Additionally, combined δ18Odiatom and chironomid interpretations provide new information on changes related to meltwater input to lakes. Hence, this diatom isotope study provides further insight into hydrology and climate dynamics of this remote, rarely investigated area. © 2014 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946549148&doi=10.1016%2fj.gloplacha.2014.04.008&partnerID=40&md5=f9aa007897318689c78c07884dda95a3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11468
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A43, Potsdam, Germany
Recommended Citation:
Meyer H.,Chapligin B.,Hoff U.,et al. Oxygen isotope composition of diatoms as Late Holocene climate proxy at Two-Yurts Lake, Central Kamchatka, Russia[J]. Global and Planetary Change,2015-01-01,134.