Mengis, Nadine , Partanen, . I. , Jalbert, J. and Matthews, H. R. (2019) 1.5 °C carbon budget dependent on carbon cycle uncertainty and future non-CO2 forcing. [Talk] In: IUGG General Assembly 2019. , 08.-18.07.2019, Montreal, Canada .

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Abstract

Estimates of the 1.5 °C carbon budget vary widely among recent studies, emphasizing the need to better understand and quantify key sources of uncertainty. Here we quantify the impact of carbon cycle uncertainty and non-CO2 forcing on the 1.5 °C carbon budget in the context of a prescribed 1.5 °C temperature stabilization scenario. We use Bayes theorem to weight members of a perturbed parameter ensemble with varying land and ocean carbon uptake, to derive an estimate for the fossil fuel (FF) carbon budget of 469 PgC since 1850, with a 95% likelihood range of (411,528) PgC. CO2 emissions from land-use change (LUC) add about 230 PgC. Our best estimate of the total (FF + LUC) carbon budget for 1.5 °C is therefore 699 PgC, which corresponds to about 11 years of current emissions. Non-CO2 greenhouse gas and aerosol emissions represent equivalent cumulative CO2 emissions of about 510 PgC and −180 PgC for 1.5 °C, respectively. The increased LUC, high non-CO2 emissions and decreased aerosols in our scenario, cause the long-term FF carbon budget to decrease following temperature stabilization. In this scenario, negative emissions would be required to compensate not only for the increasing non-CO2 climate forcing, but also for the declining natural carbon sinks.

Document Type:	Conference or Workshop Item (Talk)
Research affiliation:	OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
International?:	Yes
Date Deposited:	07 Jul 2021 11:53
Last Modified:	07 Jul 2021 11:53
URI:	https://oceanrep.geomar.de/id/eprint/53269

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