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10Be concentrations in snow at Law Dome, Antarctica following the 29 October 2003 and 20 January 2005 solar cosmic ray events


Pedro, JB and Smith, AM and Duldig, ML and Klekociuk, AR and Simon, KJ and Curran, MAJ and van Ommen, TD and Fink, DA and Morgan, VI and Galton-Fenzi, BK, 10Be concentrations in snow at Law Dome, Antarctica following the 29 October 2003 and 20 January 2005 solar cosmic ray events, Advances in Geosciences, 14, (Solar Terrestrial) pp. 285-303. (2007) [Refereed Article]

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Copyright 2007 World Scientific Publishing Co.


Recent model calculations have attempted to quantify the contribution of major energetic solar cosmic ray (SCR) events to 10Be production. In this study we compare modeled 10Be production by SCR events to measured 10Be concentrations in a Law Dome snow pit record. The snow pit record spans 2.7 years, providing a quasi-monthly 10Be sampling resolution which overlaps with the SCR events of 29 Oct 2003 and 20 Jan 2005. These events were calculated to increase monthly 10Be production in the polar atmosphere (>65 S geomagnetic latitude) by ~60% and ~120% above the GCR background, respectively. A strong peak in 10Be concentrations (>4σ above the 2.7 y mean value) was observed ~1 month after the 20 Jan 2005 event. By contrast, no signal in 10Be concentrations was observed following the weaker 29 Oct 2003 series of events. The concentration of 10Be in ice core records involves interplay between production, transport, and deposition processes. We used a particle dispersion model to assess vertical and meridional transport of aerosols from the lower stratosphere where SCR production of 10Be is expected to occur, to the troposphere from where deposition to the ice sheet occurs. Model results suggested that a coherent SCR production signal could be transported to the troposphere within weeks to months following both SCR events. We argue that only the 20 Jan 2005 SCR event was observed in measured concentrations due to favorable atmospheric transport, relatively high production yield compared to the 29 Oct 2003 event, and a relatively high level of precipitation in the Law Dome region in the month following the event. This result encourages further examination of SCR signals in 10Be ice core data.

Item Details

Item Type:Refereed Article
Keywords:beryllium, isotope, solar cosmic ray events, SCR, Law Dome, snow, ice core
Research Division:Earth Sciences
Research Group:Atmospheric sciences
Research Field:Atmospheric aerosols
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Atmospheric processes and dynamics
UTAS Author:Pedro, JB (Dr Joel Pedro)
UTAS Author:Duldig, ML (Dr Marc Duldig)
UTAS Author:Curran, MAJ (Dr Mark Curran)
UTAS Author:van Ommen, TD (Dr Tas van Ommen)
UTAS Author:Morgan, VI (Mr Vincent Morgan)
UTAS Author:Galton-Fenzi, BK (Dr Ben Galton-Fenzi)
ID Code:62568
Year Published:2007
Deposited By:IASOS
Deposited On:2010-03-12
Last Modified:2015-09-30
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