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Beryllium-10 transport to Antarctica: Results from seasonally resolved observations and modeling

Citation

Pedro, JB and Heikkila, UE and Klekociuk, A and Smith, AM and van Ommen, TD and Curran, MAJ, Beryllium-10 transport to Antarctica: Results from seasonally resolved observations and modeling, Journal of Geophysical Research, 116, (D23) Article D23120. ISSN 2156-2202 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 American Geophysical Union

DOI: doi:10.1029/2011JD016530

Abstract

Cosmogenic 10Be measured in polar ice cores has important application in the reconstruction of past solar activity. However, the processes controlling its atmospheric transport and deposition to the ice sheets are not fully understood. Here we use the seasonal changes in 10Be concentrations in a 10 year monthly resolved ice core record from the Law Dome site (East Antarctica) in conjunction with ECHAM5-HAM general circulation model (GCM) simulations of 10Be and 7Be deposition as tools to examine this problem. Maximum 10Be concentrations are observed in the ice core during the austral late summer to early autumn (summer-autumn), while minimum concentrations are observed during the austral winter. The GCM simulations, corroborated by earlier observations of 10Be:7Be ratios in Antarctica from the Georg von Neumayer air sampling station, suggest that the 10Be concentration maximum is linked to direct input of stratospheric 10Be from the Antarctic stratosphere to the lower levels of the Antarctic troposphere during the austral summer-autumn. This result contrasts with the modeled transport of 10Be to Greenland, where the seasonal maximum in stratospheric input is seen in the late winter to spring, synchronous with the timing of the seasonal maximum in midlatitude stratosphere to troposphere exchange. Our results suggest that a different combination of processes is responsible for the transport of 10Be to the Antarctic and Greenland ice sheets.

Item Details

Item Type:Refereed Article
Keywords:beryllium 10, Antarctica, ice cores, solar activity, Greenland
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Pedro, JB (Mr Joel Pedro)
Author:van Ommen, TD (Dr Tas van Ommen)
Author:Curran, MAJ (Dr Mark Curran)
ID Code:76821
Year Published:2011
Web of Science® Times Cited:12
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-03-14
Last Modified:2017-10-06
Downloads:0

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