DOI: 10.1029/2019GC008751
论文题名: Alkenone Distributions and Hydrogen Isotope Ratios Show Changes in Haptophyte Species and Source Water in the Holocene Baltic Sea
作者: Weiss G.M. ; Massalska B. ; Hennekam R. ; Reichart G.-J. ; Sinninghe Damsté J.S. ; Schouten S. ; van der Meer M.T.J.
刊名: Geochemistry, Geophysics, Geosystems
ISSN: 15252027
出版年: 2020
卷: 21, 期: 2 语种: 英语
英文关键词: alkenones
; Baltic Sea
; haptophytes
; hydrogen isotopes
Scopus关键词: Glaciers
; Hydrogen
; Isotopes
; Sea level
; Water
; Alkenones
; Baltic sea
; Dynamic environments
; haptophytes
; Holocene sediments
; Hydrogen isotope
; Long chain alkenones
; Species composition
; Population distribution
; alga
; alkenone
; community composition
; Holocene
; hydrogen isotope
; isotopic analysis
; isotopic ratio
; salinity
; Atlantic Ocean
; Baltic Sea
; Haptophyceae
; Littorina
英文摘要: The Baltic Sea, a dynamic, marginal marine basin, experienced a number of large changes in salinity during the Holocene as a result of fluctuations in global and local sea level related to melting of glacial ice sheets and subsequent isostatic rebound. These changes likely had pronounced effects on the species composition of haptophytes, a common phytoplankton group found in the Baltic Sea. This dynamic environment provides the ideal setting to study how species change impacts distribution and hydrogen isotope ratios of long-chain alkenones (δ2HC37), haptophyte-specific biomarkers. Here we analyzed the aforementioned parameters in Holocene sediments covering the contrasting hydrological phases of the Baltic Sea. Alkenone distributions changed with different Baltic Sea salinity phases, suggesting that species shifts coincide with salinity change. δ2HC37 values show two major shifts: one in the middle of the freshwater Ancylus Lake phase (10.6 to 7.7 ka) and a second at the transition from the brackish Littorina Sea phase (7.2 to 3 ka) into the fresher Modern Baltic (3 ka to the present). The first shift represents a significant enrichment of 50‰, which cannot be explained by salinity or species changes only. At this time, the isotopically depleted ice sheets had melted, and only the relatively enriched freshwater source remained. The second shift, coincident with a change in distribution, is likely caused by a change in species composition alone. These findings show that hydrogen isotope ratios of long-chain alkenones, combined with their relative distribution, can be used to reconstruct changes in source water. © 2020. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159604
Appears in Collections: 气候变化与战略
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作者单位: Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Texel, Netherlands; Now at Department of Geosciences, Pennsylvania State University & Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Department of Geology, University of Warsaw, Warsaw, Poland; Department of Ocean Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Texel, Netherlands; Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands
Recommended Citation:
Weiss G.M.,Massalska B.,Hennekam R.,et al. Alkenone Distributions and Hydrogen Isotope Ratios Show Changes in Haptophyte Species and Source Water in the Holocene Baltic Sea[J]. Geochemistry, Geophysics, Geosystems,2020-01-01,21(2)