气候变化领域集成服务门户(CCPortal): Multi-proxy evidence for millennial-scale changes in North Pacific Holocene hydroclimate from the Kenai Peninsula lowlands; south-central Alaska

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DOI	10.1016/j.quascirev.2020.106420
	Multi-proxy evidence for millennial-scale changes in North Pacific Holocene hydroclimate from the Kenai Peninsula lowlands; south-central Alaska
	Broadman E.; Kaufman D.S.; Henderson A.C.G.; Berg E.E.; Anderson R.S.; Leng M.J.; Stahnke S.A.; Muñoz S.E.
发表日期	2020
ISSN	0277-3791
卷号	241
英文摘要	The Holocene hydroclimate of south-central Alaska has been studied extensively, but conflicting interpretations between oxygen isotope paleoclimate datasets are seemingly as common as converging reconstructions, in part due to the challenges of interpreting oxygen isotope ratios in terms of climate. Here, we present a new Holocene record of biogenic silica abundance (BSi), diatom flora, and diatom oxygen isotopes (δ18OBSi) analyzed in sediments from Sunken Island Lake (SIL) in the Kenai Peninsula lowlands, which we interpret in the context of previously published paleoclimate records, and use to understand regional changes in hydroclimate. Changes in lake level documented by aerial photography coupled with a survey of regional lake water isotopes indicate SIL is sensitive to changes in the balance of precipitation and evaporation (P-E). However, an analysis of SIL δ18OBSi over the instrumental period indicates that δ18OBSi is sensitive to both P-E and the isotope composition of precipitation (δ18Oprecip), which is driven by changes in the Aleutian Low atmospheric pressure cell (AL). We attribute a ∼2‰ increase in δ18OBSi from 5.5 to 4.5 ka cal BP to a stronger AL, which resulted in the delivery of isotopically heavier precipitation to the Kenai lowlands, and wetter conditions during the late Holocene. These interpretations are supported by late Holocene increases in the relative abundance of planktonic diatoms and BSi-inferred storminess, and by evidence for higher-than-present lake levels on the paleo-shorelines above SIL at ∼1.5–0.5 ka cal BP. Our dataset demonstrates that this region was characterized by relatively low lake levels and dry climate in the early Holocene, a strengthening of the AL in the late Holocene, and wetter climate during the late Holocene until recent decades. © 2020 Elsevier Ltd
英文关键词	Aleutian Low; Biogenic silica; Diatom oxygen isotopes; Holocene; Hydroclimate; Kenai lowlands; South-central Alaska
语种	英语
scopus关键词	Aerial photography; Antennas; Atmospheric pressure; Isotopes; Lakes; Oxygen; Silica; Biogenic silica; Isotope compositions; Multi-proxy evidences; Oxygen isotope ratios; Oxygen isotopes; Paleoclimate records; Planktonic diatoms; Relative abundance; Silicon; climate change; diatom; Holocene; hydrometeorology; lake level; lowland environment; oxygen isotope; paleoclimate; plankton; proxy climate record; reconstruction; Alaska; Kenai Peninsula; United States; Bacillariophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151404
作者单位	School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ, United States; School of Geography, Politics & Sociology, Newcastle University, Newcastle upon Tyne, United Kingdom; Kenai National Wildlife Refuge, U.S. Fish and Wildlife Service, Soldotna, AK, United States; National Environmental Isotope Facility, Isotope Geosciences Facility, British Geological Survey, Keyworth, Nottingham, United Kingdom; Centre for Environmental Geochemistry, School of Biosciences, University of Nottingham, Nottingham, United Kingdom; Marine Science Center, Department of Marine & Environmental Science, Northeastern University, Nahant, MA, United States
推荐引用方式 GB/T 7714	Broadman E.,Kaufman D.S.,Henderson A.C.G.,et al. Multi-proxy evidence for millennial-scale changes in North Pacific Holocene hydroclimate from the Kenai Peninsula lowlands; south-central Alaska[J],2020,241.
APA	Broadman E..,Kaufman D.S..,Henderson A.C.G..,Berg E.E..,Anderson R.S..,...&Muñoz S.E..(2020).Multi-proxy evidence for millennial-scale changes in North Pacific Holocene hydroclimate from the Kenai Peninsula lowlands; south-central Alaska.Quaternary Science Reviews,241.
MLA	Broadman E.,et al."Multi-proxy evidence for millennial-scale changes in North Pacific Holocene hydroclimate from the Kenai Peninsula lowlands; south-central Alaska".Quaternary Science Reviews 241(2020).