DOI: 10.1016/j.quascirev.2018.05.003
Scopus记录号: 2-s2.0-85047064895
论文题名: Subtropical hydroclimate during Termination V (∼430-422 ka): Annual records of extreme precipitation, drought, and interannual variability from Santa Barbara Basin
作者: Napier T.J. ; Hendy I.L. ; Hinnov L.A. ; Brown E.T. ; Shevenell A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 191 起始页码: 73
结束页码: 88
语种: 英语
英文关键词: El Niño-Southern Oscillation
; Interannual hydroclimate
; North America
; North Pacific
; Paleoclimatology
; Quaternary
; Sedimentology-marine cores
; Termination V
Scopus关键词: Atmospheric pressure
; Drought
; Glacial geology
; Principal component analysis
; Sedimentology
; Silicon compounds
; Tropics
; Interannual
; Marine cores
; North America
; North Pacific
; Paleoclimatology
; Quaternary
; Southern oscillation
; Climate change
; annual variation
; atmospheric circulation
; drought
; El Nino-Southern Oscillation
; extreme event
; foraminifera
; hydrometeorology
; marine isotope stage
; paleoclimate
; precipitation (climatology)
; Quaternary
; sediment core
; sedimentology
; subtropical region
; California
; Pacific Ocean
; Pacific Ocean (North)
; Santa Barbara Basin
英文摘要: Hydroclimate extremes are expected to become more frequent and intense with anthropogenic climate forcing, but future El Niño-Southern Oscillation (ENSO) behavior is unclear. Understanding of extreme hydroclimate variability and magnitude prior to human-influences is limited by short instrumental records, however, continuous sedimentary archives of past hydroclimate variability can complement and extend these records. Laminated Santa Barbara Basin (SBB) sediment cores MV0508-33JPC, −21JPC, and −29JPC preserve annually-resolved, multi-centennial-scale precipitation records from Termination V (TV), the transition from glacial Marine Isotope Stage (MIS) 12 to interglacial MIS 11 at 424 ka. These records provide insights into the subtropical hydroclimate response to warming. Foraminiferal δ18O variations indicate rapid warming and/or salinity changes, and were used to verify the TV age assignment. A paleoprecipitation proxy was developed using the first principal component of scanning XRF elemental counts (PC1), which has high loadings for siliciclastic sediment-associated elements K, Ti, and Si. Sedimentary laminae couplets identified in PC1 were annually-tuned to investigate TV paleoprecipitation variability, as modern SBB laminae represent annual deposits. Extreme flooding and decadal-to-centennial droughts were identified, with magnitudes exceeding modern observations. ENSO-like (2–7 year) paleoprecipitation periodicities coincide with wetter intervals, but ENSO variability is reduced during droughts. A 1500-year arid interval may be related to poleward shifting of general atmospheric circulation as ice sheets melted, such that the subtropical dry zone intersected California. Southern California paleoprecipitation reconstructions from past warm climates provide insight into precipitation variability and magnitude on interannual timescales, and can reduce uncertainties in predictions of interannual climate, including ENSO. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112160
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, United States; Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA 22030, United States; Large Lakes Observatory, Department of Earth and Environmental Sciences, University of Minnesota Duluth, Duluth, MN 55812, United States; College of Marine Sciences, University of South Florida, St. Petersburg, Florida 33701, United States
Recommended Citation:
Napier T.J.,Hendy I.L.,Hinnov L.A.,et al. Subtropical hydroclimate during Termination V (∼430-422 ka): Annual records of extreme precipitation, drought, and interannual variability from Santa Barbara Basin[J]. Quaternary Science Reviews,2018-01-01,191