Atmospheric CO2 and d13C-CO2 reconstruction of the little ice age from antarctic ice cores

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dc.contributor.authorRubino, Men_AU
dc.contributor.authorEtheridge, DMen_AU
dc.contributor.authorTrudinger, CMen_AU
dc.contributor.authorAllison, CEen_AU
dc.contributor.authorRayner, PJen_AU
dc.contributor.authorMulvaney, Ren_AU
dc.contributor.authorSteele, LPen_AU
dc.contributor.authorLangenfelds, RLen_AU
dc.contributor.authorSturges, WTen_AU
dc.contributor.authorCurran, MAJen_AU
dc.contributor.authorSmith, AMen_AU
dc.date.accessioned2015-11-10T23:17:09Zen_AU
dc.date.available2015-11-10T23:17:09Zen_AU
dc.date.issued2015-04-12en_AU
dc.date.statistics2015-09-04en_AU
dc.description.abstractThe decrease of atmospheric CO2 concentration recorded in Antarctic ice around 1600 AD is one of the most significant atmospheric changes to have occurred during the last millennia, before the onset of the industrial period.Together with the temperature decrease, the CO2 drop has been used to derive the sensitivity of carbon stores to climate. However, the cause of it is still under debate because models are not yet able to reproduce either its magnitude, or its timing. Here we present new measurements of the CO2 concentration decrease recorded in an ice core from a medium accumulation rate site in Antarctica (DML). We show that the new record is compatible(differences <2 ppm) with the CO2 record from the high accumulation rate DSS site on Law Dome (East Antarctica), when the different age distributions are taken into account. We have also measured the d13C-CO2 change in DML ice, filling a gap around 1600 AD in the DSS d13C record. We use a double deconvolution of the CO2 and d13C records together to provide quantitative evidence that the CO2 decrease was caused by a change in the net flux to the terrestrial biosphere. Finally, we provide a new interpretation of a published record showing increasing atmospheric carbonyl sulphide during the CO2 decrease, suggesting that cooler LIA climate affected terrestrial biospheric fluxes. Altogether our findings support the hypothesis that reduced soil heterotrophic respiration is likely to have given the most significant contribution to the LIA CO2 decrease implying a positive CO2-climate feedback. © 2015, Authors.en_AU
dc.identifier.articlenumberEGU2015-9747-2en_AU
dc.identifier.articlenumberEGU2015-9747-2en_AU
dc.identifier.citationRubino, M., Etheridge, D., Trudinger, C., Allison, C., Rayner, P., Mulvaney, R., Steele, P., Langenfelds, R., Sturgess, W., Curren, M., & Smith, A. (2015). Atmospheric CO₂ reconstruction of the little ice age from Antarctic ice cores. Presentation to the European Geosciences Union General Assembly 2015, 12th -17th April 2015. Vienna, Austria,en_AU
dc.identifier.conferenceenddate17 April 2015en_AU
dc.identifier.conferencenameEuropean Geosciences Union General Assembly 2015en_AU
dc.identifier.conferenceplaceVienna, Austriaen_AU
dc.identifier.conferencestartdate12 April 2017en_AU
dc.identifier.govdoc6019en_AU
dc.identifier.otherVol. 17, EGU2015-9747-2, 2015en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2015/EGU2015-9747-2.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6405en_AU
dc.identifier.volume17en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectClimatesen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectIceen_AU
dc.subjectAntarctic regionsen_AU
dc.subjectBiosphereen_AU
dc.subjectAmbient temperatureen_AU
dc.titleAtmospheric CO2 and d13C-CO2 reconstruction of the little ice age from antarctic ice coresen_AU
dc.typeConference Abstracten_AU
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