12,000 year record of sea spray and minerogenic input from Emerald Lake, Macquarie Island

• Other Authors: AADC (owner), AADC, DATA OFFICER (distributor), AADC, DATA OFFICER (custodian), AU/AADC > Australian Antarctic Data Centre, Australia (hasAssociationWith), Australian Antarctic Data Centre (publisher), Australian Antarctic Division (sponsor), SAUNDERS, KRYSTYNA MAGDALENA (collaborator), SAUNDERS, KRYSTYNA MAGDALENA (hasPrincipalInvestigator), SAUNDERS, KRYSTYNA MAGDALENA (author), Saunders, K.M. (originator)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: oceans; climatologyMeteorologyAtmosphere; EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY; PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENTS; BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS; RADIOCARBON; HOLOCENE; MACQUARIE ISLAND; WESTERLY WINDS; LAKE SEDIMENT CORERS; SEDIMENT CORERS; FIELD SURVEYS; LABORATORY; Palaeo Start Date 0 ka; Palaeo Stop Date 11.7 ka; PHANEROZOIC > CENOZOIC > QUATERNARY > AMD/AU; AMD; CEOS; OCEAN > SOUTHERN OCEAN > GEOGRAPHIC REGION > POLAR; Antarc*; Antarctic; Macquarie Island; Sea ice; Southern Ocean
• Online Access: https://researchdata.edu.au/12000-year-sea-macquarie-island/2819541

Progress Code: completed Statement: Please note: final record is a composite of sediment cores collected in 2006, 2009/10 and 2013. Details are in supplementary information. Dates provided in temporal coverage correspond to the runtime of the project. Purpose Holocene westerly wind record from Macquarie Island for use as a comparison to other studies from Macquarie Island or elsewhere. Reconstructed sea spray and minerogenic data for a 12,000 year lake sediment record from Emerald Lake, Macquarie Island. Proxies are based on biological (diatoms) and geochemical (micro x-ray fluorescence and hyperspectral imaging) indicators. Data correspond to the figures in: Saunders et al. 2018 Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing. Nature Geoscience 11:650-655. doi.org/10.1038/s41561-018-0186-5. Detailed supplementary information: https://static-content.springer.com/esm/art%3A10.1038%2Fs41561-018-0186-5/MediaObjects/41561_2018_186_MOESM1_ESM.pdf Abstract: The Southern Hemisphere westerly winds (SHW) play an important role in regulating the capacity of the Southern Ocean carbon sink. They modulate upwelling of carbon-rich deep water and, with sea ice, determine the ocean surface area available for air–sea gas exchange. Some models indicate that the current strengthening and poleward shift of these winds will weaken the carbon sink. If correct, centennial- to millennial-scale reconstructions of the SHW intensity should be linked with past changes in atmospheric CO2, temperature and sea ice. Here we present a 12,300-year reconstruction of wind strength based on three independent proxies that track inputs of sea-salt aerosols and minerogenic particles accumulating in lake sediments on sub-Antarctic Macquarie Island. Between about 12.1 thousand years ago (ka) and 11.2 ka, and since about 7 ka, the wind intensities were above their long-term mean and corresponded with increasing atmospheric CO2. Conversely, from about 11.2 to 7.2 ka, the wind intensities were below ...