HR: 11:30h
AN: SH22B-04    [Abstracts]
TI: Climate Sensitivity of Earth to Solar Irradiance: update II
AU: * Douglass, D H
EM: douglass@pas.rochester.edu
AF: University of Rochester, River Campus, Rochester, NY 14627 United States
AB: This paper is a continuation of a study by Douglass, Clader and Knox (DCKI) [1]. In that paper we determined the solar effect on the lower tropospheric global temperature T using the Total Solar Irradiance (TSI) of Frohlich and Lean (FL)[2]. The sensitivity k, determined primarily by the 11 year activity cycle, was found to be twice that expected from a no-feedback Stefan-Boltzmann radiation balance model implying positive feedback. A linear trend of 77mK/decade was also found from that analysis. Since DCKI it has come to our attention that there is another construction of TSI by Willson and Mordvinov (WM)[3]. The WM TSI shows the familiar 11 year cycle but differs from FL in that they find a positive trend for TSI while FL find a negative trend. We now do a new analysis on T using the TSI of WM to determine the differences. We expect the sensitivity k to be nearly the same. However, the linear trend estimate could be significantly reduced. 1. D. H. Douglass, B. D. Clader, and R. S. Knox, Paper presented at 2004 Solar Radiation and Climate (SORCE) meeting on Decade Variability in the Sun and the Climate. See http://arXiv.org/abs/physics/0411002. 2.C. Fr”hlich and J. Lean, Geophys. Res. Lett. 25, 4377-4380 (1998). Version 18: http://www.obsun.pmodwrc.ch 3.R. C. Willson and A. V. Mordvinov. Geophys. Res. Lett. 30(5), article 1199 (2003)
DE: 1650 Solar variability
DE: 7537 Solar and stellar variability
DE: 7594 Instruments and techniques
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2005 Joint Assembly