Cloud radiation forcings and feedbacks
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Cloud radiation forcings and feedbacks general circulation model tests and observational validation by

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

Subjects:

  • Atmospheric general circulation models.,
  • Radiation measurement.,
  • Air water interactions.,
  • Climate models.,
  • Parameterization.,
  • Water vapor.,
  • Moisture content.,
  • Atmospheric radiation.,
  • Climatology.

Book details:

Edition Notes

StatementWan-Ho Lee, Sam F. Iacobellis, and Richard C.J. Somerville.
Series[NASA contractor report] -- 207261., NASA contractor report -- NASA CR-207261.
ContributionsIacobellis, Sam F., Somerville, Richard., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15547615M

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The book focuses largely on the physical principles and approximations that are required to develop important topics in atmospheric radiation, cloud physics, and thermal equilibrium. Aspects of the interactions and feedbacks of radiation-cloud and dynamic and climate processes are discussed using a hierarchy of atmospheric by: Cloud Radiation Forcings and Feedbacks: General Circulation Model Tests and Observational Validation Using an atmospheric general circulation model (the National Center for Atmospheric Research Community Climate Model: CCM2), the effects on climate sensitivity of several different cloud radiation parameterizations have been investigated. In addition to the original cloud radiation .   For the longwave feedbacks, the decrease in high effective cloudiness for the schemes without interactive radiative properties leads to a negative feedback, while for the other cases, the longwave feedback is cloud radiation parameterizations are empirically validated by using a single-column diagnostic model, together with Cited by: reduction in the cloud droplet size at constant liquid water content) as applicable in the context of liquid clouds, yielding global mean radiative forcings ranging from − to Wm−2. Because of the large uncertainties in aerosol and cloud processes and their parametrizations in general circulation.

Cloud feedback (λ CRE) in UKESM1 and the HadGEM3‐GC‐LL configurations are found to be at the upper end of the CMIP5 5–95% range (Table 2) but below the maximum found in CMIP5 ( W m −2 K −1, Andrews, Gregory, et al., ). The other feedback processes (λ LWcs and λ SWcs) are relatively close to the CMIP5 mean, as is EffF 2x. The global mean net cloud feedback in response to short-term (interannual) fluctuations in nature is estimated to be W m −2 K −1 with a 2σ uncertainty of W m −2 K −1 (Dessler, ; Dessler and Loeb, ), which is in agreement with the ensemble average short-term cloud feedback in climate models (Table 1).   The monthly SST autocorrelations as a function of calendar month and lag from the control simulation, which includes all feedbacks and forcings, and from observations are shown for the CWP region in Fig. 6. The simulated autocorrelations are based on the ensemble average from a set of 50 simulations, where each ensemble member has the same ENSO. Global warming - Global warming - Feedback mechanisms and climate sensitivity: There are a number of feedback processes important to Earth’s climate system and, in particular, its response to external radiative forcing. The most fundamental of these feedback mechanisms involves the loss of longwave radiation to space from the surface. Since this radiative loss increases with increasing.

The cloud feedback thus depends on changes in the frequency of occurrence and the optical properties of all the different cloud types. It's an enormously complex problem. Following the notation in the lecture on climate sensitivity and feedback, we can write the change in the top-of-atmosphere energy budget after the response to a radiative. The forcings introduced above—orbital forcing, changes in albedo, and the effects of greenhouse gases—can all be characterized as imbalances between incoming solar radiation energy and outgoing thermal IR radiation from the planet, radiative forcings. feedbacks, though the balance of evidence favours a positive clear-sky water vapour feedback of a magnitude comparable to that found in simulations. Probably the greatest uncertainty in future projections of climate arises from clouds and their interactions with radiation. Cloud feedbacks depend upon changes in cloud height, amount. Book Description. Our current climate is strongly influenced by atmospheric composition, and changes in this composition are leading to climate change. Physics of Radiation and Climate takes a look at how the outward flow of longwave or terrestrial radiation is affected by the complexities of the atmosphere’s molecular spectroscopy. This book.