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Earth System Dynamics An interactive open-access journal of the European Geosciences Union

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Earth Syst. Dynam. Discuss., 4, 25-47, 2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Jan 2013
Review status
This discussion paper has been under review for the journal Earth System Dynamics (ESD). A final paper in ESD is not foreseen.
Estimation of the climate feedback parameter by using radiative fluxes from CERES EBAF
P. Björnbom
KTH Royal Institute of Technology, c/o Pehr Björnbom, Kometvägen 1, 18333 Täby, Sweden

Abstract. Top-of-the-Atmosphere (TOA) net radiative flux anomalies from Clouds and Earth's Radiant Energy Systems (CERES) Energy Balanced and Filled (EBAF) and surface air temperature anomalies from HadCRUT3 were compared for the time interval September 2000–May 2011. In a phase plane plot with the radiative flux anomalies lagging the temperature anomalies with 7 months the phase plane curve approached straight lines during about an eight months long period at the beginning and a five year period at the end of the interval. Both of those periods, but more clearly the latter one, could be connected to the occurrence of distinct El Niño Southern Oscillation (ENSO) episodes. This result is explained by using a hypothesis stating that non-radiative forcing connected to the ENSO is dominating the temperature changes during those two periods and that there is a lag between the temperature change and the radiative flux feedback. According to the hypothesis the slopes of the straight lines equal the value of the climate feedback parameter. By linear regression based on the mentioned five year period the value of the climate feedback parameter was estimated to 5.5 ± 0.6 W m−2 K−1 (± two standard errors).

Citation: Björnbom, P.: Estimation of the climate feedback parameter by using radiative fluxes from CERES EBAF, Earth Syst. Dynam. Discuss., 4, 25-47, doi:10.5194/esdd-4-25-2013, 2013.
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