10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition

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dc.contributor.authorHeikkilä, UEen_AU
dc.contributor.authorShi, Xen_AU
dc.contributor.authorPhipps, SJen_AU
dc.contributor.authorSmith, AMen_AU
dc.date.accessioned2016-08-17T00:15:46Zen_AU
dc.date.available2016-08-17T00:15:46Zen_AU
dc.date.issued2014-04-01en_AU
dc.date.statistics2016-09-17en_AU
dc.description.abstractThis study investigates the effect of deglacial climate on the deposition of the solar proxy 10Be globally, and at two specific locations, the GRIP site at Summit, Central Greenland, and the Law Dome site in coastal Antarctica. The deglacial climate is represented by three 30 year time slice simulations of 10 000 BP (years before present = 1950 CE), 11 000 and 12 000 BP, compared with a preindustrial control simulation. The model used is the ECHAM5-HAM atmospheric aerosol–climate model, driven with sea-surface temperatures and sea ice cover simulated using the CSIRO Mk3L coupled climate system model. The focus is on isolating the 10Be production signal, driven by solar variability, from the weather- or climate-driven noise in the 10Be deposition flux during different stages of climate. The production signal varies at lower frequencies, dominated by the 11 year solar cycle within the 30 year timescale of these experiments. The climatic noise is of higher frequencies than 11 years during the 30 year period studied. We first apply empirical orthogonal function (EOF) analysis to global 10Be deposition on the annual scale and find that the first principal component, consisting of the spatial pattern of mean 10Be deposition and the temporally varying solar signal, explains 64% of the variability. The following principal components are closely related to those of precipitation. Then, we apply ensemble empirical decomposition (EEMD) analysis to the time series of 10Be deposition at GRIP and at Law Dome, which is an effective method for adaptively decomposing the time series into different frequency components. The low-frequency components and the long-term trend represent production and have reduced noise compared to the entire frequency spectrum of the deposition. The high-frequency components represent climate-driven noise related to the seasonal cycle of e.g. precipitation and are closely connected to high frequencies of precipitation. These results firstly show that the 10Be atmospheric production signal is preserved in the deposition flux to surface even during climates very different from today's both in global data and at two specific locations. Secondly, noise can be effectively reduced from 10Be deposition data by simply applying the EOF analysis in the case of a reasonably large number of available data sets, or by decomposing the individual data sets to filter out high-frequency fluctuations. © Author(s) 2014.en_AU
dc.identifier.citationHeikkilä, U., Shi, X., Phipps, S. J., & Smith, A. M. (2014). 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition. Climate of The Past, 10, 687–696. doi:10.5194/cp-10-687-2014en_AU
dc.identifier.govdoc6980en_AU
dc.identifier.issn1814-9332en_AU
dc.identifier.journaltitleClimate of The Pasten_AU
dc.identifier.pagination687-696en_AU
dc.identifier.urihttp://dx.doi.org/10.5194/cp-10-687-2014en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7338en_AU
dc.identifier.volume10en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectClimatesen_AU
dc.subjectAntarcticaen_AU
dc.subjectSeasen_AU
dc.subjectWeatheren_AU
dc.subjectAtmospheric precipitationsen_AU
dc.subjectDataen_AU
dc.subjectSimulationen_AU
dc.subjectGreenhouse gasesen_AU
dc.subjectGlaciersen_AU
dc.subject.otherQuaternary perioden_AU
dc.title10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be depositionen_AU
dc.typeJournal Articleen_AU
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