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1. agupubs.onlinelibrary.wiley.com › doi › fullObservational Evidence for a Stability Iris Effect in the Tropics

   agupubs.onlinelibrary.wiley.com › doi › full

   Jul 8, 2020 · The Iris and stability Iris relationships are also weak and non-significant for ice opaque clouds (0.5 < |r| < 0.6 for Iris and r < 0.4 for stability Iris), which are found at the deepest cores of convective systems. This suggests that the cloud fraction of deep convective cores is less constrained by the upper tropospheric clear-sky mass ...

   • Author: Marion Saint-Lu, Sandrine Bony, Jean-Louis Dufresne
   • Cited By: 25

   • Publish Year: 2020
   • Published: 08 July 2020

2. agupubs.onlinelibrary.wiley.com › doi › pdfObservational Evidence for a Stability Iris Effect in the Tropics

   agupubs.onlinelibrary.wiley.com › doi › pdf

   Abstract Anvil clouds cover extensive areas of the tropics, and their response to global warming can affect cloud feedbacks and climate sensitivity. A growing number of models and theories suggest that when the tropical atmosphere warms, anvil clouds rise and their coverage decreases, but observational support for this behavior remains limited.

3. dspace.mit.edu › bitstream › handleThe Iris Effect: A Review - Massachusetts Institute of Technology

   dspace.mit.edu › bitstream › handle

   This is referred to as the iris effect since the areal change hypothetically resembles the light control by the human eyes iris. If the effect is strong enough, it exerts a significant negative. ’. climate feedback which stabilizes tropical temperatures and limits climate sensitivity.

4. www.researchgate.net › publication › 342811280Observational Evidence for a Stability Iris Effect in the Tropics

   www.researchgate.net › publication › 342811280

   Jul 20, 2020 · Abstract Anvil clouds cover extensive areas of the tropics, and their response to global warming can. affect cloud feedbacks and climate sensitivity. A growing number of models and theories ...

5. www.nature.com › articles › s41561/024/01420-6Greater climate sensitivity implied by anvil cloud thinning

   www.nature.com › articles › s41561/024/01420-6

   Apr 17, 2024 · We now seek to understand how changes in the ice cloud continuum affect C ice, ... that the ice-free area exposed by a ... Y.-S. et al. Revisiting the iris effect of tropical cirrus clouds with ...

6. courses.seas.harvard.edu › climate › eliIris hypothesis - Harvard University

   courses.seas.harvard.edu › climate › eli

   Iris hypothesis. The iris hypothesis is a hypothesis proposed by Professor Richard Lindzen in 2001 that suggested increased sea surface temperature in the tropics would result in reduced cirrus clouds and thus more infrared radiation leakage from Earth's atmosphere. His study of observed changes in cloud coverage and modeled effects on infrared ...

7. People also ask

   Are tropical clouds a stable Iris effect?

   • By using meteorological reanalyses, we further show that this behavior is consistent with the stability Iris effect suggested by theory and modeling studies. These results improve our physical understanding of the response of tropical clouds to warming and present relationships that may be used to test climate models.

   Observational Evidence for a Stability Iris Effect in the Tropics

   agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020GL089059

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   How does Iris effect affect ice-free tropics?

   • Invoking the iris effect with a magnitude of −22%/K allowed resolution with- out any additional greenhouse gas, while 5%/K allowed for an ice-free tropics while also allowing complete resolution with the addition of CO2 well within what was allowed by geological data.

   The Iris Effect: A Review - Massachusetts Institute of Technology

   dspace.mit.edu/bitstream/handle/1721.1/132106/13143_2021_Article_238.pdf

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   Does Iris affect climate sensitivity?

   • climate feedback which stabilizes tropical temperatures and limits climate sensitivity. Initial responses to Lindzen et al. (Bull. Am. Meteor. Soc. 82:417-432, 2001) denied the existence and effectiveness of the iris effect. Assessment of the debatable issues in these responses will be presented later in this review paper.

   The Iris Effect: A Review - Massachusetts Institute of Technology

   dspace.mit.edu/bitstream/handle/1721.1/132106/13143_2021_Article_238.pdf

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   How does the iris affect surface temperature?

   • This dependence appears to act as an iris (by analogy with the eye’s iris) that opens and closes dry regions so as to inhibit changes in surface temperature (in contrast to the eye’s iris, which does the same in order to counter changes in light intensity).

   Does the Earth Have an Adaptive Infrared Iris? - Department of Atmosp…

   atmos.washington.edu/~salathe/papers/papers/Lindzen_2001-iris.pdf

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8. atmos.washington.edu › Lindzen_2001-irisDoes the Earth Have an Adaptive Infrared Iris?

   atmos.washington.edu › Lindzen_2001-iris

   This new mechanism would, in effect, constitute an adaptive infrared iris that opens and closes in order to control the Outgoing Longwave Radiation in response to changes in surface temperature in a manner similar to the way in which an eye’s iris opens and closes in response to changing light levels.