Reduced marine phytoplankton sulphur emissions in the Southern Ocean during the past seven glacials
| Autor: | Toshitaka Suzuki, Takayuki Miyake, Yutaka Kondo, Kumiko Goto-Azuma, Takayuki Kuramoto, Ryu Uemura, Motohiro Hirabayashi, Hideaki Motoyama, Toshimitsu Sakurai, Keisuke Suzuki, Yoshinori Iizuka, Yoshiyuki Fujii, Makoto Igarashi, Koji Fujita, Shinichiro Horikawa, Shohei Hattori |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Atmospheric chemistry Science Climate Oceans and Seas Sulfur Acids General Physics and Astronomy chemistry.chemical_element Antarctic Regions 02 engineering and technology Palaeoclimate General Biochemistry Genetics and Molecular Biology Article 03 medical and health sciences Ice core Radiation budget Phytoplankton Ice Cover Seawater Glacial period lcsh:Science Multidisciplinary Geography Atmosphere fungi Temperature Sulfur cycle Biological pump East antarctica General Chemistry Carbon Dioxide 021001 nanoscience & nanotechnology Sulfur 030104 developmental biology Oceanography chemistry lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019) |
| ISSN: | 2041-1723 |
| Popis: | 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. Ice core derived marine biogenic sulphate does not agree with marine sediment records. Here based on new ice core records spanning the past 720,000 years obtained from Dome Fuji the authors propose that dust contributed a higher percentage of sulphate aerosols than previously thought. |
| Databáze: | OpenAIRE |
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