Terrestrial uptake due to cooling responsible for low atmospheric CO2 during the Little Ice Age

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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.authorEnting, Ien_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.accessioned2022-05-05T22:07:44Zen_AU
dc.date.available2022-05-05T22:07:44Zen_AU
dc.date.issued2016-03-07en_AU
dc.date.statistics2022-05-03en_AU
dc.description.abstractModels of future carbon cycle-climate changes predict a large range in atmospheric CO2, mainly because of uncertainties in the response of the land carbon cycle to the future temperature increase. The Little Ice Age (LIA, 1500-1750 AD) CO2 decrease is the most significant pre-industrial atmospheric change over the last millennia and has been used to derive the climate sensitivity of the global carbon cycle (δ). While a recent study confirms that pre-industrial CO2 variations were caused by changes in land carbon stores, there are open questions about the size of the atmospheric LIA CO2 decrease reconstructed from ice cores, and about what caused the land to sequester CO2. To quantify the size of the LIA CO2 decrease, we have produced new CO2 measurements from DML ice, that support the DSS LIA CO2 decrease as a real atmospheric feature. To partition the contribution of ocean and land, we have measured the δ 13C-CO2, showing that the cause of the CO2 drop was uptake by the terrestrial biosphere. To identify whether the land uptake was caused by temperature, or by a decline in farming due to pandemics, we have simulated the effect of a temperature perturbation on atmospheric Carbonyl Sulfide (COS). In agreement with the previously published positive COS anomaly, our results indicate that Global Primary Productivity (GPP) decreased during the LIA, ruling out the early anthropogenic land use change hypothesis as the dominant cause of increased terrestrial carbon storage. This allows us to obtain a new, more coherent estimation of δ in the range -10/-60 Pg of C K-1.en_AU
dc.identifier.citationRubino, M., Etheridge, D.M., Trudinger, C.M., Allison, C.E., Rayner P.J., Enting, I., Mulvaney, R., Steele, L.P., Langenfelds, R.L., Sturges, W.T., Curran, M.A.J. & Smith, A.M. (2016). Terrestrial uptake due to cooling responsible for low atmospheric CO2 during the Little Ice Age. Paper presented at IPICS 2016, International Partnerships in Ice Core Sciences, Second Open Science Conference, 7-11 March 2016, Hobart, Tasmania.en_AU
dc.identifier.conferenceenddate11 March 2016en_AU
dc.identifier.conferencenameIPICS 2016, International Partnerships in Ice Core Sciences, Second Open Science Conferenceen_AU
dc.identifier.conferenceplaceHobart, Tasmaniaen_AU
dc.identifier.conferencestartdate7 March 2016en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13126en_AU
dc.language.isoenen_AU
dc.publisherAntarctic Climate and Ecosystems Cooperative Research Centreen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectLittle Ice Ageen_AU
dc.subjectClimatic changeen_AU
dc.subjectCarbon cycleen_AU
dc.subjectBiosphereen_AU
dc.subjectPaleoclimatologyen_AU
dc.titleTerrestrial uptake due to cooling responsible for low atmospheric CO2 during the Little Ice Ageen_AU
dc.typeConference Abstracten_AU
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