DOI: 10.1016/j.epsl.2018.04.001
Scopus记录号: 2-s2.0-85046340154
论文题名: Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia
作者: Wurtzel J.B. ; Abram N.J. ; Lewis S.C. ; Bajo P. ; Hellstrom J.C. ; Troitzsch U. ; Heslop D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492 起始页码: 264
结束页码: 278
语种: 英语
英文关键词: deglaciation
; Indo-Pacific
; ITCZ
; oxygen isotopes
; speleothem
; Younger Dryas
Scopus关键词: Atmospheric thermodynamics
; Calcite
; Glacial geology
; Moisture
; Oceanography
; Rain
; Deglaciations
; Indo-Pacific
; ITCZ
; Oxygen isotopes
; speleothem
; Younger Dryas
; Climate change
; atmospheric moisture
; climate effect
; climate variation
; geological record
; hydrological response
; intertropical convergence zone
; last deglaciation
; meridional circulation
; monsoon
; overturn
; oxygen isotope
; paleoclimate
; proxy climate record
; speleothem
; Younger Dryas
; Atlantic Ocean
; Atlantic Ocean (North)
; Greater Sunda Islands
; Indian Ocean
; Indonesia
; Sumatra
; Sunda Isles
英文摘要: Abrupt changes in Atlantic Meridional Overturning Circulation are known to have affected the strength of the Indian and Asian Monsoons during glacial and deglacial climate states. However, there is still much uncertainty around the hydroclimate response of the Indo-Pacific Warm Pool (IPWP) region to abrupt climate changes in the North Atlantic. Many studies suggest a mean southward shift in the intertropical convergence zone (ITCZ) in the IPWP region during phases of reduced Atlantic meridional overturning, however, existing proxies have seasonal biases and conflicting responses, making it difficult to determine the true extent of North Atlantic forcing in this climatically important region. Here we present a precisely-dated, high-resolution record of eastern Indian Ocean hydroclimate variability spanning the last 16 ky (thousand years) from δ18O measurements in an aragonite–calcite speleothem from central Sumatra. This represents the western-most speleothem record from the IPWP region. Precipitation arrives year-round at this site, with the majority sourced from the local tropical eastern Indian Ocean and two additional long-range seasonal sources associated with the boreal and austral summer monsoons. The Sumatran speleothem demonstrates a clear deglacial structure that includes 18O enrichment during the Younger Dryas and 18O depletion during the Bølling–Allerød, similar to the pattern seen in speleothems of the Asian and Indian monsoon realms. The speleothem δ18O changes at this site are best explained by changes in rainfall amount and changes in the contributions from different moisture pathways. Reduced rainfall in Sumatra during the Younger Dryas is most likely driven by reductions in moisture transport along the northern or southern monsoon transport pathways to Sumatra. Considered with other regional proxies, the record from Sumatra suggests the response of the IPWP to North Atlantic freshwater forcing is not solely driven by southward shifts of the ITCZ, but also a reduction in moisture transport along both monsoon pathways. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109889
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; ARC Centre of Excellence for Climate System Science, Australian National University, Canberra, ACT, Australia; School of Physical Environmental and Mathematical Sciences, University of New South Wales, Canberra, ACT, Australia; School of Earth Sciences, University of Melbourne, Melbourne, VIC, Australia; School of Geography, University of Melbourne, Melbourne, VIC, Australia
Recommended Citation:
Wurtzel J.B.,Abram N.J.,Lewis S.C.,et al. Tropical Indo-Pacific hydroclimate response to North Atlantic forcing during the last deglaciation as recorded by a speleothem from Sumatra, Indonesia[J]. Earth and Planetary Science Letters,2018-01-01,492