Holocene precipitation seasonality in northern Svalbard: Influence of sea ice and regional ocean surface conditions

• Published in: Quaternary Science Reviews
• Main Authors: Kjellman, Sofia E., Schomacker, Anders, Thomas, Elizabeth K., Hakansson, Lena, Duboscq, Sandrine, Cluett, Allison A., Farnsworth, Wesley R., Allaart, Lis, Cowling, Owen C., McKay, Nicholas P., Brynjolfsson, Skafti, Ingolfsson, Olafur
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier Ltd. 2020
• Subjects: Arctic; biomarkers; hydrogen isotopes; lake; lake sediment; n-alkanoic acids; paleoclimatology; precipitation seasonality; quaternary; sea ice; Svalbard; Sea ice; Spitsbergen
• Online Access: http://hdl.handle.net/10477/84169; https://doi.org/10.1016/j.quascirev.2020.106388

This is a post-print of an article published in Quaternary Science Reviews. The version of record is available on the publisher site. 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. Fieldwork, radiocarbon dates, and laboratory analyses were funded by ...