An energy balance perspective on regional CO2-induced temperature changes in CMIP5 models

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http://hdl.handle.net/10138/185058

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Räisänen , J 2017 , ' An energy balance perspective on regional CO2-induced temperature changes in CMIP5 models ' , Climate dynamics : observational, theoretical and computational research on the climate system , vol. 48 , no. 9-10 , pp. 3441-3454 . https://doi.org/10.1007/s00382-016-3277-2

Title: An energy balance perspective on regional CO2-induced temperature changes in CMIP5 models
Author: Räisänen, Jouni
Contributor organization: Department of Physics
Date: 2017-05
Language: eng
Number of pages: 14
Belongs to series: Climate dynamics : observational, theoretical and computational research on the climate system
ISSN: 0930-7575
DOI: https://doi.org/10.1007/s00382-016-3277-2
URI: http://hdl.handle.net/10138/185058
Abstract: An energy balance decomposition of temperature changes is conducted for idealized transient CO2-only simulations in the fifth phase of the Coupled Model Intercomparison Project. The multimodel global mean warming is dominated by enhanced clear-sky greenhouse effect due to increased CO2 and water vapour, but other components of the energy balance substantially modify the geographical and seasonal patterns of the change. Changes in the net surface energy flux are important over the oceans, being especially crucial for the muted warming over the northern North Atlantic and for the seasonal cycle of warming over the Arctic Ocean. Changes in atmospheric energy flux convergence tend to smooth the gradients of temperature change and reduce its land-sea contrast, but they also amplify the seasonal cycle of warming in northern North America and Eurasia. The three most important terms for intermodel differences in warming are the changes in the clear-sky greenhouse effect, clouds, and the net surface energy flux, making the largest contribution to the standard deviation of annual mean temperature change in 34, 29 and 20 % of the world, respectively. Changes in atmospheric energy flux convergence mostly damp intermodel variations of temperature change especially over the oceans. However, the opposite is true for example in Greenland and Antarctica, where the warming appears to be substantially controlled by heat transport from the surrounding sea areas.
Subject: Temperature change
Energy budget
Atmospheric heat convergence
Surface energy flux
CMIP5
CLIMATE MODELS
FEEDBACK
SURFACE
SIMULATIONS
ADJUSTMENT
SNOW
CO2
114 Physical sciences
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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