globalchange  > 气候减缓与适应
DOI: 10.1016/j.quascirev.2018.06.027
Scopus记录号: 2-s2.0-85049334462
论文题名:
Holocene atmospheric circulation in the central North Pacific: A new terrestrial diatom and δ18O dataset from the Aleutian Islands
作者: Bailey H.L.; Kaufman D.S.; Sloane H.J.; Hubbard A.L.; Henderson A.C.G.; Leng M.J.; Meyer H.; Welker J.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 194
起始页码: 27
结束页码: 38
语种: 英语
英文关键词: Diatoms ; Holocene ; Limnology ; North Pacific ; Paleoclimate ; Stable isotopes
Scopus关键词: Isotopes ; Lakes ; Limnology ; Moisture ; Phytoplankton ; Diatoms ; Holocenes ; North Pacific ; Paleoclimates ; Stable isotopes ; Climatology ; advection ; atmospheric forcing ; Beringia ; climate variation ; cyclogenesis ; data set ; Holocene ; limnology ; marine environment ; oxygen isotope ; paleoclimate ; precipitation (climatology) ; proxy climate record ; stable isotope ; terrestrial environment ; Adak Island ; Alaska ; Aleutian Islands ; Andreanof Islands ; Heart Lake ; Pacific Ocean ; Pacific Ocean (North) ; United States ; Wyoming ; Bacillariophyta
英文摘要: The North Pacific is a zone of cyclogenesis that modulates synoptic-scale atmospheric circulation, yet there is a paucity of instrumental and paleoclimate data to fully constrain its long-term state and variability. We present the first Holocene oxygen isotope record (δ18Odiatom) from the Aleutian Islands, using siliceous diatoms preserved in Heart Lake on Adak Island (51.85° N, 176.69° W). This study builds on previous work demonstrating that Heart Lake sedimentary δ18Odiatom values record the δ18O signal of precipitation, and correlate significantly with atmospheric circulation indices over the past century. We apply this empirical relationship to interpret a new 9.6 ka δ18Odiatom record from the same lake, supported by diatom assemblage analysis. Our results demonstrate distinct shifts in the prevailing trajectory of storm systems that drove spatially heterogeneous patterns of moisture delivery and climate across the region. During the early-mid Holocene, a warmer/wetter climate prevailed due to a predominantly westerly Aleutian Low that enhanced advection of warm 18O-enriched Pacific moisture to Adak, and culminated in a δ18Odiatom maxima (33.3‰) at 7.6 ka during the Holocene Thermal Maximum. After 4.5 ka, relatively lower δ18Odiatom indicates cooler/drier conditions associated with enhanced northerly circulation that persisted into the 21st century. Our analysis is consistent with surface climate conditions inferred from a suite of terrestrial and marine climate-proxy records. This new Holocene dataset bridges the gap in an expanding regional network of paleoisotope studies, and provides a fresh assessment of the complex spatial patterns of Holocene climate across Beringia and the atmospheric forces driving them. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112104
Appears in Collections:气候减缓与适应

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作者单位: Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK 99508, United States; Alfred Wegener Institute for Polar and Marine Research, Potsdam, 14473, Germany; Department of Ecology and Genetics, University of Oulu, Oulu, Finland; School of Earth Sciences & Environmental Sustainability, Northern Arizona University, Flagstaff, AZ 86011, United States; NERC Isotope Geosciences Facility, British Geological Survey, Nottingham, NG12 5GG, United Kingdom; Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology, UiT The Arctic University of Norway, Tromsø, 9037, Norway; School of Geography, Politics and Sociology, Newcastle University, Newcastle-upon-Tyne, NE7 1RU, United Kingdom; Centre for Environmental Geochemistry, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, United Kingdom

Recommended Citation:
Bailey H.L.,Kaufman D.S.,Sloane H.J.,et al. Holocene atmospheric circulation in the central North Pacific: A new terrestrial diatom and δ18O dataset from the Aleutian Islands[J]. Quaternary Science Reviews,2018-01-01,194
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