DOI: 10.5194/cp-9-841-2013
Scopus记录号: 2-s2.0-84881123180
论文题名: Controls of caribbean surface hydrology during the mid-to late holocene: Insights from monthly resolved coral records
作者: Giry C. ; Felis T. ; Kolling M. ; Wei W. ; Lohmann G. ; Scheffers S.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 2 起始页码: 841
结束页码: 858
语种: 英语
Scopus关键词: coral reef
; fossil record
; Holocene
; hydrology
; isotopic composition
; long-term change
; numerical model
; oxygen isotope
; paleoclimate
; precipitation (climatology)
; proxy climate record
; reconstruction
; sea surface
; sea surface temperature
; seasonality
; temporal variation
; timescale
; Amazon River
; Atlantic Ocean
; Caribbean Sea
英文摘要: Several proxy-based and modeling studies have investigated long-term changes in Caribbean climate during the Holocene, however, very little is known on its variability on short timescales. Here we reconstruct seasonality and interannual to multidecadal variability of sea surface hydrology of the southern Caribbean Sea by applying paired coral Sr/Ca and 18O measurements on fossil annually banded Diploria strigosa corals from Bonaire. This allows for better understanding of seasonal to multidecadal variability of the Caribbean hydrological cycle during the mid-to late Holocene. The monthly resolved coral 1 18O records are used as a proxy for the oxygen isotopic composition of seawater (18Osw) of the southern Caribbean Sea. Consistent with modern day conditions, annual 18Osw cycles reconstructed from three modern corals reveal that freshwater budget at the study site is influenced by both net precipitation and advection of tropical freshwater brought by wind-driven surface currents. In contrast, the annual 18Osw cycle reconstructed from a mid-Holocene coral indicates a sharp peak towards more negative values in summer, suggesting intense summer precipitation at 6 ka BP (before present). In line with this, our model simulations indicate that increased seasonality of the hydrological cycle at 6 ka BP results from enhanced precipitation in summertime. On interannual to multidecadal timescales, the systematic positive correlation observed between reconstructed sea surface temperature and salinity suggests that freshwater discharged from the Orinoco and Amazon rivers and transported into the Caribbean by wind-driven surface currents is a critical component influencing sea surface hydrology on these timescales. © 2013 Author(s). 资助项目: DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49426
Appears in Collections: 气候变化与战略
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Recommended Citation:
Giry C.,Felis T.,Kolling M.,et al. Controls of caribbean surface hydrology during the mid-to late holocene: Insights from monthly resolved coral records[J]. Climate of the Past,2013-01-01,9(2)