DOI: 10.1016/j.quascirev.2017.03.018
Scopus记录号: 2-s2.0-85018459459
论文题名: Holocene glacier activity reconstructed from proglacial lake Gjøavatnet on Amsterdamøya, NW Svalbard
作者: de Wet G.A. ; Balascio N.L. ; D'Andrea W.J. ; Bakke J. ; Bradley R.S. ; Perren B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 183 起始页码: 188
结束页码: 203
语种: 英语
英文关键词: Fram strait
; Freshwater forcing
; Glaciers
; Holocene paleoclimate
; Lake sediments
; Svalbard
Scopus关键词: Biogeochemistry
; Biological materials
; Catchments
; Climate change
; Deposition
; Ferroelectric RAM
; Forestry
; Glacial geology
; Glaciers
; Lakes
; Organic compounds
; Runoff
; Fram strait
; Freshwater forcing
; Lake sediments
; Paleoclimates
; Svalbard
; Sediments
; catchment
; climate conditions
; climate forcing
; community composition
; diatom
; glacial lake
; glacier advance
; glaciology
; historical record
; Holocene
; lacustrine deposit
; latitude
; meltwater
; organic matter
; paleoclimate
; paleoenvironment
; reconstruction
; Arctic
; Svalbard
; Svalbard and Jan Mayen
; Bacillariophyta
英文摘要: Well-dated and highly resolved paleoclimate records from high latitudes allow for a better understanding of past climate change. Lake sediments are excellent archives of environmental change, and can record processes occurring within the catchment, such as the growth or demise of an upstream glacier. Here we present a Holocene-length, multi-proxy lake sediment record from proglacial lake Gjøavatnet on the island of Amsterdamøya, northwest Svalbard. Today, Gjøavatnet receives meltwater from the Annabreen glacier and contains a record of changes in glacier activity linked to regional climate conditions. We measured changes in organic matter content, dry bulk density, bulk carbon isotopes, elemental concentrations via Itrax core-scanning, and diatom community composition to reconstruct variability in glacier extent back through time. Our reconstruction indicates that glacially derived sedimentation in the lake decreased markedly at ∼11.1 cal kyr BP, although a glacier likely persisted in the catchment until ∼8.4 cal kyr BP. During the mid-Holocene (∼8.4–1.0 cal kyr BP) there was significantly limited glacial influence in the catchment and enhanced deposition of organic-rich sediment in the lake. The deposition of organic rich sediments during this time was interrupted by at least three multi-centennial intervals of reduced organic matter accumulation (∼5.9–5.0, 2.7–2.0, and 1.7–1.5 cal kyr BP). Considering our chronological information and a sedimentological comparison with intervals of enhanced glacier input, we interpret these intervals not as glacial advances, but rather as cold/dry episodes that inhibited organic matter production in the lake and surrounding catchment. At ∼1.0 cal kyr BP, input of glacially derived sediment to Gjøavatnet abruptly increased, representing the rapid expansion of the Annabreen glacier. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112289
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geosciences, University of Massachusetts Amherst, Amherst, MA 01003, United States; Department of Geology, College of William & Mary, Williamsburg, VA 23187, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Department of Earth Science, University of Bergen, Bergen, 5007, Norway; British Antarctic Survey, Cambridge, CB3 0ET, United Kingdom
Recommended Citation:
de Wet G.A.,Balascio N.L.,D'Andrea W.J.,et al. Holocene glacier activity reconstructed from proglacial lake Gjøavatnet on Amsterdamøya, NW Svalbard[J]. Quaternary Science Reviews,2018-01-01,183