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dc.contributor.authorEiselt, Kai-Uwe
dc.contributor.authorGraversen, Rune Grand
dc.date.accessioned2023-10-25T08:07:45Z
dc.date.available2023-10-25T08:07:45Z
dc.date.issued2022-04-19
dc.description.abstractRobust estimates of climate sensitivity are important for decision-making on mitigation of climate change. However, climate sensitivity and its governing processes are still subject to large uncertainty. Recently it has been established that climate sensitivity changes over time in numerical climate model experiments with abrupt quadrupling of the CO<sub>2</sub> concentration. Here we conduct an analysis of such experiments from a range of climate models from phases 5 and 6 of the Coupled Model Intercomparison Project (CMIP). Climate feedbacks associated with clouds, lapse rate, Planck radiation, surface albedo, and water vapor and their changes over time are diagnosed based on a radiative kernel method. We find two clearly distinct model groups, one with weak and one with strong lapse-rate feedback change. The Arctic is the region showing the largest differences between these two model groups, with respect to both warming change and individual feedback changes. We retrace this change to the development over time of the Arctic sea ice, which impacts both the surface-albedo and lapse-rate feedbacks. Generally, models that warm quickly, both globally and in the Arctic, also quickly lose their Arctic sea ice and change their total global-mean climate feedback only little, and vice versa. However, it remains unclear if the Arctic changes are a cause or rather a by-product of the total global-mean feedback change. Finally, we find support for the results of previous studies finding that the relative warming in the tropical Indo-Pacific region may control the change of total climate feedback over time.en_US
dc.descriptionFor information regarding reuse of this content and general copyright information, consult the <a href=https://www.ametsoc.org/index.cfm/ams/publications/ethical-guidelines-and-ams-policies/ams-copyright-policy/>AMS Copyright Policy</a>.en_US
dc.identifier.citationEiselt, Graversen. Change in Climate Sensitivity and Its Dependence on the Lapse-Rate Feedback in 4 x CO2 Climate Model Experiments. Journal of Climate. 2022;35(9):2919-2932en_US
dc.identifier.cristinIDFRIDAID 2047772
dc.identifier.doi10.1175/JCLI-D-21-0623.1
dc.identifier.issn0894-8755
dc.identifier.issn1520-0442
dc.identifier.urihttps://hdl.handle.net/10037/31625
dc.language.isoengen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.ispartofEiselt, K.U. (2023). On the time-dependence of climate sensitivity. (Doctoral thesis). <a href=https://hdl.handle.net/10037/31607>https://hdl.handle.net/10037/31607</a>.
dc.relation.journalJournal of Climate
dc.relation.projectIDMeteorologisk institutt: 181090en_US
dc.relation.projectIDSigma2: NS9063Ken_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The American Meteorological Society.en_US
dc.titleChange in Climate Sensitivity and Its Dependence on the Lapse-Rate Feedback in 4 x CO2 Climate Model Experimentsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US


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