Negative Climate Feedbacks

Scott Church
Does the Earth Have an Adaptive Infrared Iris?
Lindzen et al. 2001. BAMS, 82 (3)
The Year 2001 paper from R.S. Lindzen and colleagues in which they first proposed their "Iris" hypothesis, in which sea surface temperatures (SST's) are inversely correlated with outgoing longwave radiation (OLR) increases and suggestions of a cooling effect on global temperatures.
No Evidence for Iris
Hartmann & Michelsen. 2002. BAMS, 83 (2)
A paper by Hartmann & Michelsen which demonstrates that the proposed mechanism driving the SST - OLR inverse correlation (anvil cloud moisture detrainment) does not correlate with SST itself.
Reply to "No Evidence for Iris"
Lindzen et al. 2002. BAMS, 83 (3)
A reply by Lindzen et al. to the comments of Hartmann & Michelsen.
Reply to Lindzen et al. on "No Evidence for Iris"
Hartmann & Michelsen. 2002. BAMS, 83 (9)
Appendix: A Two-Box Model of Cloud-Weighted Sea-Surface Temperature - The Semi-Automatic Negative Correlation with Mean Cloud Fraction
Hartmann & Michelsen. 2002. BAMS, 83 (9)
A further reply to Lindzen et al. from Hartmann & Michelsen. The first link is the body of the reply, and the second is an Appendix with supporting analysis on mean cloud fraction correlations.
Tropical Cirrus & Water Vapor: An Effective Earth Infrared Iris Feedback?
Fu Atmospheric Chemistry & Physics Journal, Jan. 30, 2002)
A paper from Fu et al. demonstrating that Lindzen et al. used Japanese Geostationary Meteorological Satellite (GMS-5) satellite data incorrectly and overestimated high cloud radiative emissions and water vapor feedbacks.
The Iris Hypothesis: A Negative or Positive Cloud Feedback?
Lin J. Climate, 15 (1)
A paper from Lin et al. that replaced Lindzen et al.'s modeled tropical cloud radiative fluxes with actual ones derived from Tropical Rainfall Measuring Mission (TRMM) satellite data, and obtained a positive rather than a negative feedback.
Examination of New CERES Data for Evidence of Tropical Iris Feedback
Chambers J. Climate, 15, (24)
A paper from Chambers et al. similar to the Lin et al. study in which Cloud and Earth's Radiant Energy System (CERES) satellite data were used cloud radiative fluxes, also yielding a positive feedback.
Does the Earth have an Iris Analog?
Herring, D. NASA Earth Observatory
An overview of the Iris Effect, with commentary, from the NASA Earth Observatory web site.


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