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

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doi:10.5194/esdd-4-25-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Jan 2013
Review status
A revision of this discussion paper for further review has not been submitted.
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.
P. Björnbom
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
AC C1: 'Additional discussion of surface air temperature anomalies', Pehr Björnbom, 19 Jan 2013 Printer-friendly Version 
 
RC C11: 'ENSO is not a surrogate for forced climate change.', Anonymous Referee #1, 05 Feb 2013 Printer-friendly Version 
AC C27: 'Reply to Anonymous Referee #1', Pehr Björnbom, 07 Feb 2013 Printer-friendly Version 
 
AC C18: 'Reply to Troy CA', Pehr Björnbom, 05 Feb 2013 Printer-friendly Version 
SC C53: 'Comment on validation in “Estimation of the climate feedback parameter by using radiative fluxes from CERES EBAF”', Troy Masters, 16 Feb 2013 Printer-friendly Version Supplement 
 
AC C48: 'Hypotheses and estimated parameter value are supported by generally accepted ENSO theory', Pehr Björnbom, 15 Feb 2013 Printer-friendly Version 
 
AC C68: 'Observed coherent oscillations in temperature and radiative flux anomalies are also found in climate model simulations promising possible new insights into climate sensitivity', Pehr Björnbom, 23 Feb 2013 Printer-friendly Version 
 
AC C90: 'Comparison of my paper with Dessler (2013) raises some doubts about using conventional linear regression for studying feedbacks', Pehr Björnbom, 02 Mar 2013 Printer-friendly Version 
 
AC C137: 'Comparison of my paper with Armour et al. (2012) gives a possible explanation to the observed time lag in global radiative thermal response.', Pehr Björnbom, 25 Mar 2013 Printer-friendly Version 
 
RC C161: 'Review', Anonymous Referee #2, 05 Apr 2013 Printer-friendly Version 
AC C189: 'Response to Anonymous Referee \#2 and also final response: The interactive discussion and recent papers have convinced me that an even more thorough revision than a major one is needed.', Pehr Björnbom, 23 Apr 2013 Printer-friendly Version 
 
EC C202: 'Editor comment', Julia C. Hargreaves, 24 Apr 2013 Printer-friendly Version 
P. Björnbom
P. Björnbom

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