Data

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

Australian Antarctic Data Centre
SAUNDERS, KRYSTYNA MAGDALENA
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.26179/rrb0-xh91&rft.title=12,000 year record of sea spray and minerogenic input from Emerald Lake, Macquarie Island&rft.identifier=10.26179/rrb0-xh91&rft.publisher=Australian Antarctic Data Centre&rft.description=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 their long-term mean and corresponded with decreasing atmospheric CO2. These observations are consistent with model inferences of enhanced SHW contributing to the long-term outgassing of CO2 from the Southern Ocean.&rft.creator=SAUNDERS, KRYSTYNA MAGDALENA &rft.date=2021&rft.coverage=northlimit=-54.4828; southlimit=-54.77772; westlimit=158.77441; eastLimit=158.94951; projection=WGS84&rft.coverage=northlimit=-54.4828; southlimit=-54.77772; westlimit=158.77441; eastLimit=158.94951; projection=WGS84&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4156_Macquarie_Island_Emerald_Lake when using these data.&rft_subject=climatologyMeteorologyAtmosphere&rft_subject=oceans&rft_subject=GEOCHEMISTRY&rft_subject=EARTH SCIENCE&rft_subject=SOLID EARTH&rft_subject=SEDIMENTS&rft_subject=PALEOCLIMATE&rft_subject=OCEAN/LAKE RECORDS&rft_subject=DIATOMS&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=PLANTS&rft_subject=MICROALGAE&rft_subject=RADIOCARBON&rft_subject=HOLOCENE&rft_subject=MACQUARIE ISLAND&rft_subject=WESTERLY WINDS&rft_subject=LAKE SEDIMENT CORERS&rft_subject=SEDIMENT CORERS&rft_subject=FIELD SURVEYS&rft_subject=LABORATORY&rft_subject=Paleo Start Date 0 ka&rft_subject=Paleo Stop Date 11.7 ka&rft_subject=PHANEROZOIC > CENOZOIC > QUATERNARY > HOLOCENE&rft_subject=OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND&rft_subject=GEOGRAPHIC REGION > POLAR&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data
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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4156_Macquarie_Island_Emerald_Lake when using these data.

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Brief description

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 their long-term mean and corresponded with decreasing atmospheric CO2. These observations are consistent with model inferences of enhanced SHW contributing to the long-term outgassing of CO2 from the Southern Ocean.

Issued: 2021-01-18

Data time period: 2012-07-01 to 2019-06-30

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158.94951,-54.4828 158.94951,-54.77772 158.77441,-54.77772 158.77441,-54.4828 158.94951,-54.4828

158.86196,-54.63026

text: northlimit=-54.4828; southlimit=-54.77772; westlimit=158.77441; eastLimit=158.94951; projection=WGS84

Subjects
BIOLOGICAL CLASSIFICATION | DIATOMS | EARTH SCIENCE | FIELD SURVEYS | GEOCHEMISTRY | GEOGRAPHIC REGION > POLAR | HOLOCENE | LABORATORY | LAKE SEDIMENT CORERS | MACQUARIE ISLAND | MICROALGAE | OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND | OCEAN/LAKE RECORDS | PALEOCLIMATE | PHANEROZOIC > CENOZOIC > QUATERNARY > HOLOCENE | PLANTS | Paleo Start Date 0 ka | Paleo Stop Date 11.7 ka | RADIOCARBON | SEDIMENT CORERS | SEDIMENTS | SOLID EARTH | WESTERLY WINDS | climatologyMeteorologyAtmosphere | oceans |

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AU-ANL:PEAU : http://nla.gov.au/nla.party-617536

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