Production rate and climate influences on the variability of 10Be deposition simulated by ECHAM5-HAM: Globally, in Greenland and in Antarctica

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dc.contributor.authorHeikkilä, UEen_AU
dc.contributor.authorSmith, AMen_AU
dc.date.accessioned2013-09-10T23:00:14Zen_AU
dc.date.available2013-09-10T23:00:14Zen_AU
dc.date.issued2013-03-27en_AU
dc.date.statistics2013-09-11en_AU
dc.description.abstractIce core concentrations of Be-10 are used as a proxy for solar activity, but they might be affected by atmospheric transport and deposition and their changes. During the Holocene, the influence is likely to be small, but during glacials it has to be accounted for. First, the climate influence has to be understood during the present climate. This study uses an ECHAM5-HAM 30-year climatological simulation of Be-10 to investigate the production and climate-related influences on Be-10 deposition with focus on Greenland and Antarctica. We examine the climate modes driving snow accumulation and hence potentially Be-10 deposition over a climatologically relevant period. The North Atlantic Oscillation (NAO) is found to be the main driver of changes in precipitation and Be-10 deposition in Greenland, in agreement with previous studies. In Antarctica, the picture is more complex as precipitation and Be-10 deposition are only weakly correlated with the Southern Annular Mode (SAM), El Nino-Southern Oscillation (ENSO), or Zonal Wave 3 pattern (ZW3). The results suggest that on seasonal scale, Be-10 deposition is linked with both precipitation rate and tropopause height, mainly due to the similar seasonal cycle. However, the correlation with tropopause height persists on the annual time scale. All in all, Be-10 variability in Antarctica is an interplay of several processes whose contribution varies in time and space. When interpreting Be-10 ice core records for solar activity, the time scale is essentially important. On seasonal scale, the Be-10 signal is dominated by weather influences, but on multiannual scales, the production rate is the main driver. On multidecadal scale, large long-term trends in climatic factors have the potential to distort the signal again as is seen in Be-10 records during glacials. This study shows how climate modes connect to Be-10 variability and how this connection could be used to correct for the climate impact. The established connections during present climatic conditions can be used as a basis to investigate these connections during glacial climate in a glacial model simulation. © 2013, American Geophysical Union.en_AU
dc.identifier.citationHeikkilä, U., & Smith, A. M. (2013). Production rate and climate influences on the variability of Be-10 deposition simulated by ECHAM5-HAM: Globally, in Greenland, and in Antarctica. Journal of Geophysical Research: Atmospheres, 118(6), 2506-2520. doi:10.1002/jgrd.50217en_AU
dc.identifier.govdoc4942en_AU
dc.identifier.issn2169-897Xen_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitleJournal of Geophysical Research: Atmospheresen_AU
dc.identifier.pagination2506-2520en_AU
dc.identifier.urihttp://dx.doi.org/10.1002/jgrd.50217en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4676en_AU
dc.identifier.volume118en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectRadioisotopesen_AU
dc.subjectClimatesen_AU
dc.subjectEarth atmosphereen_AU
dc.subjectOscillationsen_AU
dc.subjectDepositionen_AU
dc.subjectSolar activityen_AU
dc.titleProduction rate and climate influences on the variability of 10Be deposition simulated by ECHAM5-HAM: Globally, in Greenland and in Antarcticaen_AU
dc.typeJournal Articleen_AU
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