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

This 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 yr time slice simulatio...

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Main Authors: Heikkila, U, Shi, X, Phipps, SJ, Smith, AM
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2015
Subjects:
Online Access:http://apo.ansto.gov.au/dspace/handle/10238/6279
https://doi.org/10.5194/cpd-9-5627-2013
id ftansto:oai:apo-prod.ansto.gov.au:10238/6279
record_format openpolar
spelling ftansto:oai:apo-prod.ansto.gov.au:10238/6279 2023-05-15T13:36:16+02:00 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition Heikkila, U Shi, X Phipps, SJ Smith, AM 2015-09-28 http://apo.ansto.gov.au/dspace/handle/10238/6279 https://doi.org/10.5194/cpd-9-5627-2013 en eng Copernicus Publications Heikkila, U., Shi, X., Phipps, S. J., & Smith, A. M. (2013). 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition. Climate of the Past Discussions, 9(5), 5627-5657. 1814-9324 http://dx.doi.org/10.5194/cpd-9-5627-2013 http://apo.ansto.gov.au/dspace/handle/10238/6279 ANTARCTICA CLIMATE MODELS SEAS CLIMATES PRECIPITATION SOLAR CYCLE Journal Article 2015 ftansto https://doi.org/10.5194/cpd-9-5627-2013 2019-12-23T19:03:50Z This 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 yr time slice simulations of 10 000 BP (years before present = 1950 CE), 11 000 BP 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 on lower frequencies, dominated by the 11yr solar cycle within the 30 yr time scale of these experiments. The climatic noise is of higher frequencies. We first apply empirical orthogonal functions (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 on 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.© 2013, Copernicus Publications. Article in Journal/Newspaper Antarc* Antarctica Greenland GRIP Sea ice Australian Nuclear Science and Technology Organisation: ANSTO Publications Online Greenland Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733)
institution Open Polar
collection Australian Nuclear Science and Technology Organisation: ANSTO Publications Online
op_collection_id ftansto
language English
topic ANTARCTICA
CLIMATE MODELS
SEAS
CLIMATES
PRECIPITATION
SOLAR CYCLE
spellingShingle ANTARCTICA
CLIMATE MODELS
SEAS
CLIMATES
PRECIPITATION
SOLAR CYCLE
Heikkila, U
Shi, X
Phipps, SJ
Smith, AM
10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition
topic_facet ANTARCTICA
CLIMATE MODELS
SEAS
CLIMATES
PRECIPITATION
SOLAR CYCLE
description This 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 yr time slice simulations of 10 000 BP (years before present = 1950 CE), 11 000 BP 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 on lower frequencies, dominated by the 11yr solar cycle within the 30 yr time scale of these experiments. The climatic noise is of higher frequencies. We first apply empirical orthogonal functions (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 on 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.© 2013, Copernicus Publications.
format Article in Journal/Newspaper
author Heikkila, U
Shi, X
Phipps, SJ
Smith, AM
author_facet Heikkila, U
Shi, X
Phipps, SJ
Smith, AM
author_sort Heikkila, U
title 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition
title_short 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition
title_full 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition
title_fullStr 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition
title_full_unstemmed 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition
title_sort 10be in late deglacial climate simulated by echam5-ham – part 2: isolating the solar signal from 10be deposition
publisher Copernicus Publications
publishDate 2015
url http://apo.ansto.gov.au/dspace/handle/10238/6279
https://doi.org/10.5194/cpd-9-5627-2013
long_lat ENVELOPE(112.833,112.833,-66.733,-66.733)
geographic Greenland
Law Dome
geographic_facet Greenland
Law Dome
genre Antarc*
Antarctica
Greenland
GRIP
Sea ice
genre_facet Antarc*
Antarctica
Greenland
GRIP
Sea ice
op_relation Heikkila, U., Shi, X., Phipps, S. J., & Smith, A. M. (2013). 10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition. Climate of the Past Discussions, 9(5), 5627-5657.
1814-9324
http://dx.doi.org/10.5194/cpd-9-5627-2013
http://apo.ansto.gov.au/dspace/handle/10238/6279
op_doi https://doi.org/10.5194/cpd-9-5627-2013
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