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

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.

Identification info

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

Date (Publication): 2021-02-01

Edition: 1

Citation identifier

Dataset DOI

Title: Information and documentation - Digital object identifier system

Date (Publication): 2012-04-23

Citation identifier: ISO 26324:2012

Citation identifier: doi:10.26179/rrb0-xh91

Originator

Saunders, K.M.

Publisher

Australian Antarctic Data Centre

Principal investigator

SAUNDERS, KRYSTYNA MAGDALENA

Australian Nuclear Science and Technology Organisation.

New Illawarra Road

Lucas Heights

New South Wales

2234

Australia

Collaborator

SAUNDERS, KRYSTYNA MAGDALENA

Australian Nuclear Science and Technology Organisation.

New Illawarra Road

Lucas Heights

New South Wales

2234

Australia

Name: CAASM Metadata

Website: https://data.aad.gov.au/metadata/records/AAS_4156_Macquarie_Island_Emerald_Lake

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

Status: Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Topic category

Oceans
Climatology, meteorology, atmosphere

Extent

Description: Temporal Coverage

Temporal extent

TimePeriod: 2012-07-01 2019-06-30

Extent

Description: Vertical Extent - Altitude

Vertical element

Minimum value: 170

Maximum value: 170

Identifier: urn:x-ogc:def:cs:EPSG:6499

Name: Vertical CS. Axis: height (H). Orientation: up. UoM: m.

Identifier: urn:x-ogc:def:axis:EPSG:114

Name: height

Extent

Description: Vertical Extent - Depth

Vertical element

Minimum value: 1.2

Maximum value: 1.2

Identifier: urn:x-ogc:def:cs:EPSG:6498

Name: Vertical CS. Axis: depth (D). Orientation: down. UoM: m.

Identifier: urn:x-ogc:def:axis:EPSG:113

Name: depth

Title: Holocene dynamics of the Southern Hemisphere westerly winds and possible links to CO2 outgassing

Date (Publication): 2018

Citation identifier: 11

Citation identifier: https://doi.org/10.1038/s41561-018-0186-5