C13A-0792
Arctic ice core records of vanillic acid from Siberia, Greenland, and Svalbard
Monday, 14 December 2015
Poster Hall (Moscone South)
Mackenzie M Grieman1, Eric S Saltzman1, Joe McConnell2, Diedrich Fritzsche3, Thomas Opel3, Elisabeth D Isaksson4 and Margit Schwikowski5, (1)University of California Irvine, Irvine, CA, United States, (2)Desert Research Institute, Reno, NV, United States, (3)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Department of Periglacial Research, Potsdam, Germany, (4)Norwegian Polar Institute, Tromsø, Norway, (5)Paul Scherrer Institute, Laboratory of Radiochemistry and Environmental Chemistry, Villingen, Switzerland
Abstract:
Biomass burning is a major source for atmospheric gases and aerosols, and an important part of the global carbon cycle and radiation budget. The factors controlling centennial and millennial variability in regional to global biomass burning dynamics are not well understood because there are few well-dated proxy records only. We are exploring ice core records of organic compounds resulting from incomplete combustion of lignin as tracers for biomass burning. In this study we investigate the distribution of vanillic acid (VA) in Arctic ice cores. VA is a major product of conifer combustion, but may also be produced from angiosperms. VA was measured in ice core samples using ion chromatography with electrospray MS/MS detection. Here we present measurements of vanillic acid in three Arctic ice cores from Siberia (Akademii Nauk; 0-3 kyr bp), northern Greenland (Tunu; 0-1.75 kyr bp), and Svalbard (Lomonosovfonna; 0-0.75 kyr bp). The Siberian record exhibits 3 strong centennial scale maxima (1200-600 BC, AD 300-800, and AD 1450-1700). All three cores exhibit a smaller feature around 1250, with a subsequent decline in Greenland and Svalbard. VA levels in Greenland and Svalbard are generally smaller than those in Siberia. These results suggest strong regional input from Northern Eurasian sources (i.e. boreal forests) to the Siberian core, and lower Arctic-wide “background” levels at the other sites.
