4.8 Article

Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice

Journal

NATURE GEOSCIENCE
Volume 14, Issue 10, Pages 762-+

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41561-021-00816-y

Keywords

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Funding

  1. US National Science Foundation (NSF)
  2. Royal Society Te Aparangi Marsden Fund [18-VUW-089, 15-VUW-131]
  3. New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform [ANTA1801]
  4. New Zealand Ministry of Business, Innovation and Employment Strategic Science Investment Fund (SSIF) through GNS Science [540GCT32]
  5. Dumont d'Urville NZ-France Science and Technology Programme, MARICE project [45455NF, 19-VUW-047-DDU]
  6. ERC StG ICEPROXY [203441]
  7. ANR CLIMICE
  8. FP7 Past4Future [243908]
  9. Spanish Research Council [201830I092]
  10. Spanish Ministry of Science and Innovation [CTM2017-89711-C2-1-P]
  11. European Union through FEDER funds
  12. University of Otago research grant
  13. L'Oreal-UNESCO For Women in Science Australia and New Zealand Fellowship
  14. Natural Environment Research Council [NE/L002493/1, Ne/I00646X/1]
  15. Japan Society for Promotion of Science (JSPS) [JP20H00193]
  16. National Science Foundation [OPP-0732796, PLR-1644118, OCE-1129101]

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The study used ancient sediment cores to investigate the impacts of Antarctic sea ice and subdecadal climate variability on phytoplankton bloom frequency, revealing that intensified coastal sea ice can reduce the frequency of bloom events.
Antarctic sea-ice extent, primary productivity and ocean circulation represent interconnected systems that form important components of the global carbon cycle. Subdecadal to centennial-scale variability can influence the characteristics and interactions of these systems, but observational records are too short to evaluate the impacts of this variability over longer timescales. Here, we use a 170-m-long sediment core collected from Integrated Ocean Drilling Program Site U1357B, offshore Adelie Land, East Antarctica to disentangle the impacts of sea ice and subdecadal climate variability on phytoplankton bloom frequency over the last similar to 11,400 years. We apply X-ray computed tomography, Ice Proxy for the Southern Ocean with 25 carbon atoms, diatom, physical property and geochemical analyses to the core, which contains an annually resolved, continuously laminated archive of phytoplankton bloom events. Bloom events occurred annually to biennially through most of the Holocene, but became less frequent (similar to 2-7 years) at similar to 4.5 ka when coastal sea ice intensified. We propose that coastal sea-ice intensification subdued annual sea-ice break-out, causing an increased sensitivity of sea-ice dynamics to subdecadal climate modes, leading to a subdecadal frequency of bloom events. Our data suggest that projected loss of coastal sea ice will impact the influence of subdecadal variability on Antarctic margin primary productivity, altering food webs and carbon-cycling processes at seasonal timescales.

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