Atmos. Chem. Phys. Discuss., 2, 173-180, 2002
© Author(s) 2002. This work is licensed under the
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Reply to: “Tropical cirrus and water vapor: an effective Earth infrared iris feedback?"
M.-D. Chou1, R. S. Lindzen2, and A. Y. Hou1
1Laboratory for Atmospheres, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
2Dept. of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

Abstract. In assessing the iris effect suggested by Lindzen et al. (2001), Fu et al. (2001, 2002) found that the response of high-level clouds to the sea surface temperature had an effect of reducing the climate sensitivity to external radiative forcing, but the effect was not as strong as Lindzen et al. (2001) found. The approach of Fu et al. (2001, 2002) to specifying longwave emission and cloud albedos appears to be inappropriate, and the derived cloud optical properties may not have real physical meaning. The cloud albedo calculated by Fu et al. (2001, 2002) is too large for cirrus clouds and too small for boundary layer clouds, which underestimates the iris effect.

Citation: Chou, M.-D., Lindzen, R. S., and Hou, A. Y.: Reply to: “Tropical cirrus and water vapor: an effective Earth infrared iris feedback?", Atmos. Chem. Phys. Discuss., 2, 173-180, doi:10.5194/acpd-2-173-2002, 2002.
Search ACPD
Discussion Paper
    Final Revised Paper