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Large scale changes in 20th century black carbon deposition to Antarctica

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posted on 2023-05-17, 11:11 authored by Bisiaux, MM, Edwards, R, McConnell, JR, Mark Curran, Tasman van OmmenTasman van Ommen, Smith, AM, Neumann, TA, Pasteris, DR, Penner, JE, Taylor, K
Refractory black carbon aerosols (rBC) emitted by biomass burning (fires) and fossil fuel combustion, affect global climate and atmospheric chemistry. In the Southern Hemisphere (SH), rBC is transported in the atmosphere from low latitudes to Antarctica 5 and deposited to the polar ice sheet preserving a history of emissions and atmospheric transport. Here, we present two high-resolution Antarctic rBC ice core records drilled from the West Antarctic Ice Sheet divide and Law Dome on the periphery of the East Antarctic ice sheet. Separated by ~3500 km, the records span calendar years 1850- 2001 and reflect the rBC distribution over the Indian and Pacific ocean sectors of the 10 Southern Ocean. Highly correlated over the past 60 yr, the records show that coherent large-scale changes in SH rBC occurred at decadal to inter-annual time scales, notably in ENSO-like periodicities. Decadal trends in the records are similar to inventories of SH rBC emissions from grass fires and biofuels. The combined records suggest a large-scale reduction in rBC from 1950 to 1990 over the remote Southern Hemisphere.

History

Publication title

Atmospheric Chemistry and Physics Discussions

Volume

11

Issue

10

Pagination

27815-27831

ISSN

1680-7367

Department/School

Institute for Marine and Antarctic Studies

Publisher

Copernicus Publications

Place of publication

Gottingen, Germany

Rights statement

Licensed under the Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the earth sciences

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