气候变化领域集成服务门户(CCPortal): Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions

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DOI	10.1016/j.quascirev.2020.106388
	Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions
	Kjellman S.E.; Schomacker A.; Thomas E.K.; Håkansson L.; Duboscq S.; Cluett A.A.; Farnsworth W.R.; Allaart L.; Cowling O.C.; McKay N.P.; Brynjólfsson S.; Ingólfsson Ó.
发表日期	2020
ISSN	0277-3791
卷号	240
英文摘要	Arctic precipitation is predicted to increase in the coming century, due to a combination of enhanced northward atmospheric moisture transport and local surface evaporation from ice-free seas. However, large model uncertainties, limited long-term observations, and high spatiotemporal variability limit our understanding of these mechanisms, emphasizing the need for paleoclimate records of precipitation changes. Here we use lipid biomarkers in lake sediments to reconstruct precipitation seasonality in northern Spitsbergen, Svalbard. We measured the hydrogen isotopic ratios (δ2H) of n-alkanoic acids (C20–C30) from sedimentary leaf waxes in lake Austre Nevlingen, Spitsbergen. We interpret δ2H values of mid-chain (C22) and long-chain (C28) n-alkanoic acids to represent δ2H of lake and soil water, respectively. Austre Nevlingen lake water δ2H reflects amount-weighted mean annual precipitation δ2H. In contrast, soil water is mostly recharged by summer rainfall, and therefore reflects δ2H values of summer precipitation. Austre Nevlingen leaf wax δ2H values are 2H-depleted in the Early Holocene, suggesting high winter precipitation amounts. This coincides with high summer insolation, strong Atlantic water advection and reduced spring sea-ice cover in surrounding waters. Winter precipitation continued to dominate until c. 6 cal. kyr BP. After 6 cal. kyr BP, the trend in the biomarker record is not as clear. This could be related to colder conditions causing longer duration of seasonal lake-ice cover, thereby influencing the precipitation seasonality registered by the lake water. The Austre Nevlingen record suggests a close relationship between precipitation seasonality and regional ocean surface conditions, consistent with simulations suggesting that Arctic winter sea-ice loss will lead to increased local evaporation. © 2020 The Author(s)
英文关键词	Arctic; Biomarkers; Hydrogen isotopes; Lake sediment; n-alkanoic acids; Paleoclimatology; Precipitation seasonality; Quaternary; Sea ice
语种	英语
scopus关键词	Atmospheric movements; Biomarkers; Carboxylic acids; Evaporation; Rain; Sea ice; Soil moisture; Uncertainty analysis; Atmospheric moisture; Hydrogen isotopic; Long term observations; Paleoclimate records; Precipitation change; Spatiotemporal variability; Summer precipitation; Winter precipitation; Lakes; atmospheric moisture; Holocene; lacustrine deposit; lake water; precipitation (climatology); sea ice; sea surface; seasonality; spatiotemporal analysis; Arctic; Atlantic Ocean; Spitsbergen; Svalbard; Svalbard and Jan Mayen
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/151428
作者单位	Department of Geosciences, UiT The Arctic University of Norway, Postboks 6050 Langnes, Tromsø, N-9037, Norway; Department of Geology, University at Buffalo, State University of New York, 126 Cooke Hall, Buffalo, NY 14260, United States; Department of Arctic Geology, The University Centre in Svalbard (UNIS), P.O. Box 156, Longyearbyen, N-9171, Norway; Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Askja, Sturlugata 7, Reykjavík, IS-101, Iceland; School of Earth and Sustainability, Northern Arizona University, NAU Box 4099, Flagstaff, AZ 86011, United States; Icelandic Institute of Natural History, Borgum við Norðurslóð, Akureyri, IS-600, Iceland; Faculty of Earth Sciences, University of Iceland, Sturlugata 7, Reykjavík, IS-101, Iceland
推荐引用方式 GB/T 7714	Kjellman S.E.,Schomacker A.,Thomas E.K.,et al. Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions[J],2020,240.
APA	Kjellman S.E..,Schomacker A..,Thomas E.K..,Håkansson L..,Duboscq S..,...&Ingólfsson Ó..(2020).Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions.Quaternary Science Reviews,240.
MLA	Kjellman S.E.,et al."Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions".Quaternary Science Reviews 240(2020).