Effective radiative forcing and adjustments in CMIP6 models

Smith, Christopher J.; Kramer, Ryan J.; Myhre, Gunnar; Alterskjær, Kari; Collins, William; Sima, Adriana; Boucher, Olivier; Dufresne, Jean-Louis; Nabat, Pierre; Michou, Martine; Yukimoto, Seiji; Cole, Jason; Paynter, David; Shiogama, Hideo; O'Connor, Fiona M.; Robertson, Eddy; Wiltshire, Andy; Andrews, Timothy; Hannay, Cécile; Miller, Ron; Nazarenko, Larissa; Kirkevåg, Alf; Olivié, Dirk; Fiedler, Stephanie; Lewinschal, Anna; Mackallah, Chloe; Dix, Martin; Pincus, Robert; Forster, Piers M.

doi:10.5194/acp-20-9591-2020

Title: Effective radiative forcing and adjustments in CMIP6 models

Journal Article · Mon Aug 17 00:00:00 EDT 2020 · Atmospheric Chemistry and Physics (Online)

DOI:https://doi.org/10.5194/acp-20-9591-2020· OSTI ID:1647673

;

; Nabat, Pierre; Michou, Martine;

;

; Shiogama, Hideo; O'Connor, Fiona M.; Robertson, Eddy; Wiltshire, Andy; Andrews, Timothy; Hannay, Cécile;

Abstract. The effective radiative forcing, which includes the instantaneous forcing plus adjustments from the atmosphere and surface, has emerged as the key metric of evaluating human and natural influence on the climate. We evaluate effective radiative forcing and adjustments in 17 contemporary climate models that are participating in the Coupled Model Intercomparison Project (CMIP6) and have contributed to the Radiative Forcing Model Intercomparison Project (RFMIP). Present-day (2014) global-mean anthropogenic forcing relative to pre-industrial (1850) levels from climate models stands at 2.00 (±0.23) W m−2, comprised of 1.81 (±0.09) W m−2 from CO2, 1.08 (± 0.21) W m−2 from other well-mixed greenhouse gases, −1.01 (± 0.23) W m−2 from aerosols and −0.09 (±0.13) W m−2 from land use change. Quoted uncertainties are 1 standard deviation across model best estimates, and 90 % confidence in the reported forcings, due to internal variability, is typically within 0.1 W m−2. The majority of the remaining 0.21 W m−2 is likely to be from ozone. In most cases, the largest contributors to the spread in effective radiative forcing (ERF) is from the instantaneous radiative forcing (IRF) and from cloud responses, particularly aerosol–cloud interactions to aerosol forcing. As determined in previous studies, cancellation of tropospheric and surface adjustments means that the stratospherically adjusted radiative forcing is approximately equal to ERF for greenhouse gas forcing but not for aerosols, and consequentially, not for the anthropogenic total. The spread of aerosol forcing ranges from −0.63 to −1.37 W m−2, exhibiting a less negative mean and narrower range compared to 10 CMIP5 models. The spread in 4×CO2 forcing has also narrowed in CMIP6 compared to 13 CMIP5 models. Aerosol forcing is uncorrelated with climate sensitivity. Therefore, there is no evidence to suggest that the increasing spread in climate sensitivity in CMIP6 models, particularly related to high-sensitivity models, is a consequence of a stronger negative present-day aerosol forcing and little evidence that modelling groups are systematically tuning climate sensitivity or aerosol forcing to recreate observed historical warming.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: 7457436; 1582977

OSTI ID:: 1647673

Alternate ID(s):: OSTI ID: 1770589

Journal Information:: Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Vol. 20 Journal Issue: 16; ISSN 1680-7324

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: Germany

Language:: English

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