DOI: 10.1016/j.quascirev.2016.10.006
Scopus记录号: 2-s2.0-85001610199
论文题名: Alkenone-based reconstructions reveal four-phase Holocene temperature evolution for High Arctic Svalbard
作者: van der Bilt W.G.M. ; D'Andrea W.J. ; Bakke J. ; Balascio N.L. ; Werner J.P. ; Gjerde M. ; Bradley R.S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 183 起始页码: 204
结束页码: 213
语种: 英语
英文关键词: Alkenones
; Holocene
; Paleothermometry
; Svalbard
; U37K
Scopus关键词: Digital storage
; Earth (planet)
; Global warming
; Incident solar radiation
; Lakes
; Sea ice
; Solar radiation
; Alkenones
; Holocenes
; Paleothermometry
; Svalbard
; U37K
; Ice
; alkenone
; atmospheric circulation
; climate forcing
; cooling
; global warming
; heat budget
; Holocene
; Hypsithermal
; ice sheet
; lake water
; Northern Hemisphere
; paleoclimate
; paleotemperature
; proxy climate record
; reconstruction
; uranium isotope
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Fram Strait
; Svalbard
; Svalbard and Jan Mayen
英文摘要: Situated at the crossroads of major oceanic and atmospheric circulation patterns, the Arctic is a key component of Earth's climate system. Compounded by sea-ice feedbacks, even modest shifts in the region's heat budget drive large climate responses. This is highlighted by the observed amplified response of the Arctic to global warming. Assessing the imprint and signature of underlying forcing mechanisms require paleoclimate records, allowing us to expand our knowledge beyond the short instrumental period and contextualize ongoing warming. However, such datasets are scarce and sparse in the Arctic, limiting our ability to address these issues. Here, we present two quantitative Holocene-length paleotemperature records from the High Arctic Svalbard archipelago, situated in the climatically sensitive Arctic North Atlantic. Temperature estimates are based on U37K unsaturation ratios from sediment cores of two lakes. Our data reveal a dynamic Holocene temperature evolution, with reconstructed summer lake water temperatures spanning a range of ∼6–8 °C, and characterized by four phases. The Early Holocene was marked by an early onset (∼10.5 ka cal. BP) of insolation-driven Hypsithermal conditions, likely compounded by strengthening oceanic heat transport. This warm interval was interrupted by cooling between ∼10.5–8.3 ka cal. BP that we attribute to cooling effects from the melting Northern Hemisphere ice sheets. Temperatures declined throughout the Middle Holocene, following a gradual trend that was accentuated by two cooling steps between ∼7.8–7 ka cal. BP and around ∼4.4–4.3 ka cal. BP. These transitions coincide with a strengthening influence of Arctic water and sea-ice in the adjacent Fram Strait. During the Late Holocene (past 4 ka), temperature change decoupled from the still-declining insolation, and fluctuated around comparatively cold mean conditions. By showing that Holocene Svalbard temperatures were governed by an alternation of forcings, this study improves our understanding of Arctic climate dynamics. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112294
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Science, University of Bergen, Allégaten 41, Bergen, 5007, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States; Department of Geology, College of William & Mary, Williamsburg, VA 23185, United States; Department of Geosciences, University of Massachusetts, Amherst, MA 01003, United States
Recommended Citation:
van der Bilt W.G.M.,D'Andrea W.J.,Bakke J.,et al. Alkenone-based reconstructions reveal four-phase Holocene temperature evolution for High Arctic Svalbard[J]. Quaternary Science Reviews,2018-01-01,183