气候变化领域集成服务门户(CCPortal): Insolation and greenhouse gases drove Holocene winter and spring warming in Arctic Alaska

CCPortal

DOI	10.1016/j.quascirev.2020.106438
	Insolation and greenhouse gases drove Holocene winter and spring warming in Arctic Alaska
	Longo W.M.; Huang Y.; Russell J.M.; Morrill C.; Daniels W.C.; Giblin A.E.; Crowther J.
发表日期	2020
ISSN	0277-3791
卷号	242
英文摘要	Global surface temperature changes and their drivers during the Holocene Epoch remain controversial. Syntheses of proxy data indicate that global mean annual temperature declined from the mid-Holocene until the Pre-industrial Era, a trend linked to decreasing Northern Hemisphere summer insolation. In contrast, global climate models simulate increasing mean annual temperatures driven by retreating ice sheets and increasing greenhouse gas concentrations. This proxy-model disagreement may originate from a warm season bias in Northern Hemisphere proxy reconstructions, highlighting the need for new proxies that quantify cold season temperature, especially in Arctic regions that were devoid of continental ice sheets during the Holocene. Here, we present a new 16,000-year winter-spring temperature reconstruction derived from the unsaturation ratio of alkenones (U37K) in a continuous sedimentary sequence from Lake E5, northern Alaska. We employ a thermodynamic lake model to convert alkenone-inferred lake temperatures into winter-spring air temperature anomalies and we contextualize our proxy reconstruction with climate model output from the region. Our reconstruction shows that winter-spring temperatures warmed rapidly during the deglaciation at 16 and 14 thousand years before present and continued to warm gradually throughout the middle and late Holocene (0.12–0.28 °C/thousand years) in concert with regional sea surface temperature and sea ice records. Our results are consistent with climate model simulations and we attribute Holocene warming to rising winter-spring insolation, radiative forcing from rising greenhouse gas concentrations and regional feedbacks. Our reconstructed cold season warming equaled or exceeded summer cooling according to a regional synthesis of temperature records, suggesting that seasonal biases in temperature reconstructions may account for proxy-model disagreements in Holocene temperature trends from Eastern Beringia. © 2020 Elsevier Ltd
英文关键词	Alkenone; Beringia; Continental biomarkers; Holocene; North America; Paleoclimatology; Paleolimnology; Proxy data-model comparison; Seasonality; Temperature reconstruction
语种	英语
scopus关键词	Atmospheric radiation; Atmospheric temperature; Glaciers; Greenhouse gases; Incident solar radiation; Lakes; Oceanography; Sea ice; Springs (components); Surface properties; Climate model simulations; Continental ice sheet; Global climate model; Global surface temperature; Mean annual temperatures; Sea surface temperature (SST); Sedimentary sequence; Temperature reconstruction; Climate models; arctic environment; Beringia; climate modeling; deglaciation; global climate; global warming; greenhouse gas; Holocene; ice sheet; insolation; Northern Hemisphere; proxy climate record; reconstruction; sea ice; sea surface temperature; sedimentary sequence; spring (season); surface temperature; winter; Alaska; United States
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/151385
作者单位	Department of Earth, Environmental and Planetary Sciences, Brown University, 324 Brook Street, Providence, RI 02912, United States; Institute at Brown for Environment and Society, Brown University, 324 Brook Street, Providence, RI 02912, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, 216 UCB, Boulder, CO 80309, United States; NOAA's National Centers for Environmental Information, Center for Weather and Climate, 325 Broadway, Boulder, CO 80309, United States; The Ecosystems Center, Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, United States
推荐引用方式 GB/T 7714	Longo W.M.,Huang Y.,Russell J.M.,et al. Insolation and greenhouse gases drove Holocene winter and spring warming in Arctic Alaska[J],2020,242.
APA	Longo W.M..,Huang Y..,Russell J.M..,Morrill C..,Daniels W.C..,...&Crowther J..(2020).Insolation and greenhouse gases drove Holocene winter and spring warming in Arctic Alaska.Quaternary Science Reviews,242.
MLA	Longo W.M.,et al."Insolation and greenhouse gases drove Holocene winter and spring warming in Arctic Alaska".Quaternary Science Reviews 242(2020).