Climate Sensitivity From Both Physical and Carbon Cycle Feedbacks

Goodwin, Philip, Williams, Richard G ORCID: 0000-0002-3180-7558, Roussenov, Vassil M ORCID: 0000-0003-4128-9712 and Katavouta, Anna ORCID: 0000-0002-1587-4996 (2019) Climate Sensitivity From Both Physical and Carbon Cycle Feedbacks. GEOPHYSICAL RESEARCH LETTERS, 46 (13). pp. 7554-7564.

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Official URL: http://dx.doi.org/10.1029/2019gl082887

Abstract

<jats:title>Abstract</jats:title><jats:p>The surface warming response to anthropogenic forcing is highly sensitive to the strength of feedbacks in both the physical climate and carbon cycle systems. However, the definitions of climate feedback, <jats:italic>λ</jats:italic><jats:sub>Climate</jats:sub> in W·m<jats:sup>−2</jats:sup>·K<jats:sup>−1</jats:sup>, and climate sensitivity, <jats:italic>S</jats:italic><jats:sub>Climate</jats:sub> in K/(W/m<jats:sup>2</jats:sup>), explicitly exclude the impact of carbon cycle feedbacks. Here we provide a new framework to incorporate carbon feedback into the definitions of climate feedback and sensitivity. Applying our framework to the Global Carbon Budget reconstructions reveals a present‐day terrestrial carbon feedback of <jats:italic>λ</jats:italic><jats:sub>Carbon</jats:sub> = 0.31 ± 0.09 W·m<jats:sup>−2</jats:sup>·K<jats:sup>−1</jats:sup> and an ocean carbon feedback of −0.06 to 0.015 W·m<jats:sup>−2</jats:sup>·K<jats:sup>−1</jats:sup> in Earth system models. Observational constraints reveal a combined climate and carbon feedback of <jats:italic>λ</jats:italic><jats:sub>Climate+Carbon</jats:sub> = 1.48 W·m<jats:sup>−2</jats:sup>·K<jats:sup>−1</jats:sup> with a 95% range of 0.76 to 2.32 W·m<jats:sup>−2</jats:sup>·K<jats:sup>−1</jats:sup> on centennial time scales, corresponding to a combined climate and carbon sensitivity of <jats:italic>S</jats:italic><jats:sub>Climate+Carbon</jats:sub> = 0.67 K/(W/m<jats:sup>2</jats:sup>) with a 95% range of 0.43 to 1.32 K/(W/m<jats:sup>2</jats:sup>).</jats:p>

Item Type:	Article
Uncontrolled Keywords:	13 Climate Action
Depositing User:	Symplectic Admin
Date Deposited:	02 Sep 2019 09:40
Last Modified:	15 Mar 2024 07:44
DOI:	10.1029/2019GL082887
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3052931