Data

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

Australian Ocean Data Network
Saunders, K.M. ; 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=http://data.aad.gov.au/metadata/records/AAS_4156_Macquarie_Island_Emerald_Lake&rft.title=12,000 year record of sea spray and minerogenic input from Emerald Lake, Macquarie Island&rft.identifier=http://data.aad.gov.au/metadata/records/AAS_4156_Macquarie_Island_Emerald_Lake&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.Progress Code: completedStatement: 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.&rft.creator=Saunders, K.M. &rft.creator=SAUNDERS, KRYSTYNA MAGDALENA &rft.date=2021&rft.coverage=westlimit=158.77441; southlimit=-54.77772; eastlimit=158.94951; northlimit=-54.4828&rft.coverage=westlimit=158.77441; southlimit=-54.77772; eastlimit=158.94951; northlimit=-54.4828&rft.coverage=uplimit=170; downlimit=170&rft.coverage=uplimit=170; downlimit=170&rft.coverage=uplimit=1.2; downlimit=1.2&rft.coverage=uplimit=1.2; downlimit=1.2&rft_rights=This metadata record is publicly available.&rft_rights=These data are publicly available for download from the provided URL.&rft_rights= https://creativecommons.org/licenses/by/4.0/legalcode&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. http://creativecommons.org/licenses/by/4.0/).&rft_rights=Portable Network Graphic&rft_rights=https://i.creativecommons.org/l/by/3.0/88x31.png&rft_rights=Creative Commons by Attribution logo&rft_rights=Attribution 4.0 International (CC BY 4.0)&rft_rights=Legal code for Creative Commons by Attribution 4.0 International license&rft_rights=Attribution 4.0 International (CC BY 4.0)&rft_rights= https://creativecommons.org/licenses/by/4.0/legalcode&rft_subject=oceans&rft_subject=climatologyMeteorologyAtmosphere&rft_subject=EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY&rft_subject=EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > SEDIMENTS&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS&rft_subject=EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > 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=Palaeo Start Date 0 ka&rft_subject=Palaeo Stop Date 11.7 ka&rft_subject=PHANEROZOIC > CENOZOIC > QUATERNARY > HOLOCENE&rft_subject=AMD/AU&rft_subject=AMD&rft_subject=CEOS&rft_subject=OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
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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.

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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.

Notes

Purpose
Holocene westerly wind record from Macquarie Island for use as a comparison to other studies from Macquarie Island or elsewhere.

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

This dataset is part of a larger collection

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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: westlimit=158.77441; southlimit=-54.77772; eastlimit=158.94951; northlimit=-54.4828

text: uplimit=170; downlimit=170

text: uplimit=1.2; downlimit=1.2

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

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uri : https://data.aad.gov.au/eds/5215/download

Identifiers
  • global : AAS_4156_Macquarie_Island_Emerald_Lake
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