DOI: 10.1016/j.quascirev.2015.09.007
论文题名: Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions
作者: Werner K. ; Müller J. ; Husum K. ; Spielhagen R.F. ; Kandiano E.S. ; Polyak L.
刊名: Quaternary Science Reviews
出版年: 2016
卷: 147 起始页码: 194
结束页码: 209
语种: 英语
英文关键词: Atlantic water
; Biomarkers
; Fram strait
; Holocene
; IP25
; Planktic foraminifera
; Sea ice
; Sea surface temperatures
; Subsurface
Scopus关键词: Advection
; Atmospheric temperature
; Biomarkers
; Catchments
; Ice
; Incident solar radiation
; Mooring
; Oceanography
; Repair
; Sea ice
; Sedimentation
; Solar radiation
; Surface properties
; Atlantic water
; Fram strait
; Holocenes
; IP25
; Planktic foraminifera
; Sea surface temperature (SST)
; Subsurface
; Surface waters
; Foraminifera
; Turborotalita quinqueloba
英文摘要: Two high-resolution sediment cores from eastern Fram Strait have been investigated for sea subsurface and surface temperature variability during the Holocene (the past ca 12,000 years). The transfer function developed by Husum and Hald (2012) has been applied to sediment cores in order to reconstruct fluctuations of sea subsurface temperatures throughout the period. Additional biomarker and foraminiferal proxy data are used to elucidate variability between surface and subsurface water mass conditions, and to conclude on the Holocene climate and oceanographic variability on the West Spitsbergen continental margin. Results consistently reveal warm sea surface to subsurface temperatures of up to 6 °C until ca 5 cal ka BP, with maximum seawater temperatures around 10 cal ka BP, likely related to maximum July insolation occurring at that time. Maximum Atlantic Water (AW) advection occurred at surface and subsurface between 10.6 and 8.5 cal ka BP based on both foraminiferal and dinocyst temperature reconstructions. Probably, a less-stratified, ice-free, nutrient-rich surface ocean with strong AW advection prevailed in the eastern Fram Strait between 10 and 9 cal ka BP. Weakened AW contribution is found after ca 5 cal ka BP when subsurface temperatures strongly decrease with minimum values between ca 4 and 3 cal ka BP. Cold late Holocene conditions are furthermore supported by high planktic foraminifer shell fragmentation and high δ18O values of the subpolar planktic foraminifer species Turborotalita quinqueloba. While IP25-associated indices as well as dinocyst data suggest a sustained cooling due to a decrease in early summer insolation and consequently sea-ice increase since about 7 cal ka BP in surface waters, planktic foraminiferal data including stable isotopes indicate a slight return of stronger subsurface AW influx since ca 3 cal ka BP. The observed decoupling of surface and subsurface waters during the later Holocene is most likely attributed to a strong pycnocline layer separating cold sea-ice fed surface waters from enhanced subsurface AW advection. This may be related to changes in North Atlantic subpolar versus subtropical gyre activity. © 2015 Elsevier Ltd 资助项目: Werner, K.
; Byrd Polar and Climate Research Center, The Ohio State University, 1090 Carmack Road, United States
; 电子邮件: werner.192@osu.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59521
Appears in Collections: 过去全球变化的重建
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作者单位: Byrd Polar and Climate Research Center, The Ohio State University, 1090 Carmack Road, Columbus, United States; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, Germany; Norwegian Polar Institute, Framsenteret, Hjalmar Johansens Gate 14, Tromsø, Norway; Academy of Sciences, Humanities, and Literature Mainz, Geschwister-Scholl-Straße 2, Mainz, Germany; GEOMAR Helmholtz Centre for Ocean Research, Wischhofstr. 1-3, Kiel, Germany
Recommended Citation:
Werner K.,Müller J.,Husum K.,et al. Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions[J]. Quaternary Science Reviews,2016-01-01,147