The Flux of Galactic Cosmic Rays over the last 200,000 Years calculated from Beryllium-10 Records in deep Sea Sediments

Details The Flux of Galactic Cosmic Rays over the last 200,000 Years calculated from Beryllium-10 Records in deep Sea Sediments The Flux of Galactic Cosmic Rays over the last 200,000 Years calculated from Beryllium-10 Records in deep Sea Sediments

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5948c&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5948

Computer Science

Scientific paper

The production of cosmogenic radionuclides like 10Be and 14C in the Earth's atmosphere is directly related to the flux of galactic cosmic rays (GCR) reaching the Earth's orbit. Measuring the depositional flux of 10Be, as deposited in marine sediments, therefore provides a good tool to reconstruct the GCR-flux and to study the presumed GCR-climate connection on millennial time scales. However, the deposition of 10Be into deep sea sediments also can be influenced strongly by climatically induced oceanic transport processes like sediment redistribution of adsorbed 10Be and lateral transport of dissolved 10Be. Consequently, the bulk deposition of 10Be can not be used to reconstruct the global GCR-flux. The global 10Be-production is separated from the transport signal by applying a correction procedure. While sediment redistribution is corrected by using the well established 230Thex-normalization methoda, the transport of dissolved 10Be is quantified by using a simple box model that is able to describe water mass transport and sedimentation of 10Be in the ocean. The transport-corrected 10Be-profiles represent global production changes. They can be used to calculate the flux of GCRs during the last 200,000 years (based on simulations presented by Masarik and Beerb). The comparison of the GCR-flux with climate records from stalagmites from lowc and midd latitudes shows a correlation between the growth periodes of stalagmites and times of low GCR-flux. The 10Be-based record of the GCR-flux also can be used in paleoclimate models to study the presumed GCR-climate connection on millennial timescales. begin{small} aFrank et al., in Use of Proxies in Paleoceanography: Examples from the South Atlantic (eds. Fischer, G. &Wefer, G.), 409-426 (Springer-Verlag, New York, 1999). bMasarik and Beer, Simulation of particle fluxes and cosmogenic nuclide production in the Earth's atmosphere. JGR-Atmospheres 104, 12099-12111 (1999). cNeff et al., Strong coherence between solar variability and the monsoon in Oman between 9 and 6 kyr ago. Nature 411, 290-293 (2001). dSpoetl et al., Start of the last interglacial period at 135 ka: Evidence from a high Alpine speleothem. Geology 30, 815-818 (2002).

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