Reduced marine phytoplankton sulphur emissions in the Southern Ocean during the past seven glacials
Year: 2019
Type: article
Abstract: Marine biogenic sulphur affects Earth’s radiation budget and may be an indicator of primary productivity in the Southern Ocean, which is closely related to atmospheric CO2 variability through the biological pump. Previous ice-core studies in Antarctica show little climate dependence of marine biogenic sulphur emissions and hence primary productivity, contradictory to marine sediment records. Here we present new 720,000-year ice core records from Dome Fuji in East Antarctica and show that a large portion of non-sea-salt sulphate, which was traditionally used as a proxy for marine biogenic sulphate, likely originates from terrestrial dust during glacials. By correcting for this, we make a revised calculation of biogenic sulphate and find that its flux is reduced in glacial periods. Our results suggest reduced dimethylsulphide emissions in the Antarctic Zone of the Southern Ocean during glacials and provide new evidence for the coupling between climate and the Southern Ocean sulphur cycle.
Source: Nature Communications
Authors: K. Goto-Azuma, M. Hirabayashi, H. Motoyama, T. Miyake, T. Kuramoto, R. Uemura, M. Igarashi, Y. Iizuka, T. Sakurai, S. Horikawa, K. Suzuki, T. Suzuki, K. Fujita, Y. Kondo, S. Hattori, Y. Fujii
Institutions: The Graduate University for Advanced Studies, SOKENDAI, National Institute of Polar Research, Research Organization of Information and Systems, Tokai University, Nagoya University, Hokkaido University, Institute of Low Temperature Science, Hokkaido University, Civil Engineering Research Institute for Cold Region, Public Works Research Institute, Shinshu University, Yamagata University, Tokyo Institute of Technology
Language: English
Subfield: Atmospheric Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,200
Awards: Genome analysis of ancient samples preserved in Antarctica, Variation trend of snow depth in the Japanese Alps, G1575921184, G1627175001, G1770056389, G2963934970, Triple oxygen isotopic analysis of ice core sulfate/nitrate for reconstruction of past atmospheric oxidative capacity, G4592423010, G4617983891, G5219668243, Environmental diagnosis with isotopologue tracers, G7184231001, Elevation-dependent climate changes in the Nepal Himalaya as reconstructed from tree rings and ice cores
OpenAlex ID: W2962948346