Atmospheric scaling of cosmogenic nuclide production: Climate effect

Absorption of cosmic rays by atmospheric mass varies temporally due to a redistribution of atmospheric pressure by ice sheets during glaciations, the compression and expansion of the atmosphere due to cooling and warming, and changes in katabatic winds near large ice masses. These atmospheric proces...

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Vydáno v:Journal of Geophysical Research: Solid Earth Ročník 112; číslo B2
Hlavní autoři: Staiger, Jane, Gosse, John, Toracinta, Rick, Oglesby, Bob, Fastook, James, Johnson, Jesse V.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Washington, DC Blackwell Publishing Ltd 01.02.2007
American Geophysical Union
Témata:
anthropogenic
cosmogenic
denudation
Earth sciences
Earth, ocean, space
erosion
Exact sciences and technology
land use
watershed
atmosphere
altitude
models
Atmospheric condition
absorption
ice
Katabatic wind
expansion
atmospheric pressure
glaciation
ice sheets
nunataks
Production rate
cosmic rays
climate effects
cooling
warming
temperature
compression
calibration
ISSN:0148-0227, 2156-2202
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Popis
Shrnutí:Absorption of cosmic rays by atmospheric mass varies temporally due to a redistribution of atmospheric pressure by ice sheets during glaciations, the compression and expansion of the atmosphere due to cooling and warming, and changes in katabatic winds near large ice masses. These atmospheric processes can result in changes in production rates of cosmogenic nuclides which, when integrated over long exposure durations may result in 0% to >5% adjustments in site production rates depending on location. Combining a CCM3 model with imbedded ice sheets for 20 ka, we show that production rates changes (relative to today) are greatest at high elevations (6–7% at 5 km altitude) due to atmospheric compression from decreased temperature. Production rates at specific times for sites near ice sheet margins can be reduced more than 10% due to a combination of katabatic winds draining off the ice sheet margins and atmospheric cooling. Nunatak settings may be significantly affected by the climate effect due to persistent glacial atmospheric conditions. Atmospheric variability may explain some of the disparities among cosmogenic nuclide production rate calibrations.
Bibliografie:istex:9FEF5EBD97BC98C7110DB23D4C4D5C2A18882E87
ark:/67375/WNG-4PFP86RC-J
ArticleID:2005JB003811
ISSN:0148-0227
2156-2202
DOI:10.1029/2005JB003811