DOI: 10.1016/j.quascirev.2017.12.011
Scopus记录号: 2-s2.0-85040054279
论文题名: Temperature variations in the southern Great Lakes during the last deglaciation: Comparison between pollen and GDGT proxies
作者: Watson B.I. ; Williams J.W. ; Russell J.M. ; Jackson S.T. ; Shane L. ; Lowell T.V.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 182 起始页码: 78
结束页码: 92
语种: 英语
英文关键词: Continental biomarkers
; GDGT
; Lagoons and Swamps
; Lakes
; North America
; Paleoclimatology
; Pleistocene
; Pollen
; Sedimentology
Scopus关键词: Atmospheric temperature
; Geochronology
; Glycerol
; Repair
; Sedimentology
; Vegetation
; GDGT
; North America
; Paleoclimatology
; Pleistocene
; Pollen
; Lakes
; biomarker
; fossil record
; ice sheet
; last deglaciation
; Northern Hemisphere
; paleoclimate
; paleotemperature
; pollen
; regional climate
; sedimentology
; swamp
; temperature effect
; Younger Dryas
; Great Lakes [North America]
; Ohio
; Silver Lake [Ohio]
; United States
英文摘要: Our understanding of deglacial climate history in the southern Great Lakes region of the United States is primarily based upon fossil pollen data, with few independent and multi-proxy climate reconstructions. Here we introduce a new, well-dated fossil pollen record from Stotzel-Leis, OH, and a new deglacial temperature record based on branched glycerol dialkyl glycerol tetraethers (brGDGTs) at Silver Lake, OH. We compare these new data to previously published records and to a regional stack of pollen-based temperature reconstructions from Stotzel-Leis, Silver Lake, and three other well-dated sites. The new and previously published pollen records at Stotzel-Leis are similar, but our new age model brings vegetation events into closer alignment with known climatic events such as the Younger Dryas (YD). brGDGT-inferred temperatures correlate strongly with pollen-based regional temperature reconstructions, with the strongest correlation obtained for a global soil-based brGDGT calibration (r2 = 0.88), lending confidence to the deglacial reconstructions and the use of brGDGT and regional pollen stacks as paleotemperature proxies in eastern North America. However, individual pollen records show large differences in timing, rates, and amplitudes of inferred temperature change, indicating caution with paleoclimatic inferences based on single-site pollen records. From 16.0 to 10.0ka, both proxies indicate that regional temperatures rose by ∼10 °C, roughly double the ∼5 °C estimates for the Northern Hemisphere reported in prior syntheses. Change-point analysis of the pollen stack shows accelerated warming at 14.0 ± 1.2ka, cooling at 12.6 ± 0.4ka, and warming from 11.6 ± 0.5ka into the Holocene. The timing of Bølling-Allerød (B-A) warming and YD onset in our records lag by ∼300–500 years those reported in syntheses of temperature records from the northern mid-latitudes. This discrepancy is too large to be attributed to uncertainties in radiocarbon dating, and correlation between pollen and brGDGT temperature reconstructions rules out vegetation lags as a cause. However, the YD termination appears synchronous among the brGDGT record, regional pollen stack, and Northern Hemisphere stack. The cause of the larger and lagged temperature changes in the southern Great Lakes relative to Northern Hemisphere averages remains unclear, but may be due to the effects of continentality and ice sheet extent on regional climate evolution. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112305
Appears in Collections: 气候减缓与适应
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作者单位: University of Wisconsin-Madison, 550 N. Park St., Madison, WI 53703, United States; Brown University, 324 Brook St., Providence, RI 02912, United States; U.S. Geological Survey, Department of the Interior Southwest Climate Science Center, University of Arizona, 1064 E. Lowell St., Tucson, AZ 85721, United States; Limnological Research Center, 500 Pillsbury Dr. SE, Minneapolis, MN 55455, United States; University of Cincinnati, 500 Geology/Physics Building, Cincinnati, OH 45221, United States
Recommended Citation:
Watson B.I.,Williams J.W.,Russell J.M.,et al. Temperature variations in the southern Great Lakes during the last deglaciation: Comparison between pollen and GDGT proxies[J]. Quaternary Science Reviews,2018-01-01,182