Search Results - "Webb, Mark J"

The Dependence of Global Cloud and Lapse Rate Feedbacks on the Spatial Structure of Tropical Pacific Warming by Andrews, Timothy, Webb, Mark J.

“…An atmospheric general circulation model (AGCM) is forced with patterns of observed sea surface temperature (SST) change and those output from atmosphere–ocean…”
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The Dependence of Radiative Forcing and Feedback on Evolving Patterns of Surface Temperature Change in Climate Models by Andrews, Timothy, Gregory, Jonathan M., Webb, Mark J.

“…Experiments with CO₂ instantaneously quadrupled and then held constant are used to show that the relationship between the global-mean net heat input to the…”
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Forcing, feedbacks and climate sensitivity in CMIP5 coupled atmosphere-ocean climate models by Andrews, Timothy, Gregory, Jonathan M., Webb, Mark J., Taylor, Karl E.

“…We quantify forcing and feedbacks across available CMIP5 coupled atmosphere‐ocean general circulation models (AOGCMs) by analysing simulations forced by an…”
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Mechanisms of the Negative Shortwave Cloud Feedback in Middle to High Latitudes by Ceppi, Paulo, Hartmann, Dennis L., Webb, Mark J.

“…Increases in cloud optical depth and liquid water path (LWP) are robust features of global warming model simulations in high latitudes, yielding a negative…”
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Accounting for Changing Temperature Patterns Increases Historical Estimates of Climate Sensitivity by Andrews, Timothy, Gregory, Jonathan M., Paynter, David, Silvers, Levi G., Zhou, Chen, Mauritsen, Thorsten, Webb, Mark J., Armour, Kyle C., Forster, Piers M., Titchner, Holly

“…Eight atmospheric general circulation models (AGCMs) are forced with observed historical (1871–2010) monthly sea surface temperature and sea ice variations…”
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Positive Low Cloud Feedback Primarily Caused by Increasing Longwave Radiation From the Sea Surface in Two Versions of a Climate Model by Ogura, Tomoo, Webb, Mark J., Lock, Adrian P.

“…Low cloud feedback in global warming projections by climate models is characterized by its positive sign, the mechanism of which is not well understood. Here…”
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Contributions of Different Cloud Types to Feedbacks and Rapid Adjustments in CMIP5 by Zelinka, Mark D., Klein, Stephen A., Taylor, Karl E., Andrews, Timothy, Webb, Mark J., Gregory, Jonathan M., Forster, Piers M.

“…Using five climate model simulations of the response to an abrupt quadrupling of CO₂, the authors perform the first simultaneous model intercomparison of cloud…”
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Origins of differences in climate sensitivity, forcing and feedback in climate models by Webb, Mark J., Lambert, F. Hugo, Gregory, Jonathan M.

“…We diagnose climate feedback parameters and CO 2 forcing including rapid adjustment in twelve atmosphere/mixed-layer-ocean (“slab”) climate models from the…”
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Global-mean radiative feedbacks and forcing in atmosphere-only and coupled atmosphere-ocean climate change experiments by Ringer, Mark A., Andrews, Timothy, Webb, Mark J.

“…Analysis of the available Coupled Model Intercomparison Project Phase 5 models suggests that sea surface temperature‐forced, atmosphere‐only global warming…”
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Fixed Anvil Temperature Feedback: Positive, Zero, or Negative? by Yoshimori, Masakazu, Lambert, F. Hugo, Webb, Mark J., Andrews, Timothy

“…The fixed anvil temperature (FAT) theory describes a mechanism for how tropical anvil clouds respond to global warming and has been used to argue for a robust…”
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Coupling between subtropical cloud feedback and the local hydrological cycle in a climate model by Webb, Mark. J., Lock, Adrian P.

“…In HadGEM2-A, AMIP experiments forced with observed sea surface temperatures respond to uniform and patterned +4 K SST perturbations with strong positive cloud…”
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The Cloud Feedback Model Intercomparison Project (CFMIP) contribution to CMIP6 by Webb, Mark J., Andrews, Timothy, Bodas-Salcedo, Alejandro, Bony, Sandrine, Bretherton, Christopher S., Chadwick, Robin, Chepfer, Helene, Douville, Herve, Good, Peter, Kay, Jennifer E., Tselioudis, George

“…The primary objective of CFMIP is to inform future assessments of cloud feedbacks through improved understanding of cloud-climate feedback mechanisms and…”
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The Impact of Parameterized Convection on Climatological Precipitation in Atmospheric Global Climate Models by Maher, Penelope, Vallis, Geoffrey K., Sherwood, Steven C., Webb, Mark J., Sansom, Philip G.

“…Convective parameterizations are widely believed to be essential for realistic simulations of the atmosphere. However, their deficiencies also result in model…”
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Projected increase in continental runoff due to plant responses to increasing carbon dioxide by Betts, R.A, Boucher, O, Collins, M, Cox, P.M, Falloon, P.D, Gedney, N, Hemming, D.L, Huntingford, C, Jones, C.D, Sexton, D.M.H

“…In addition to influencing climatic conditions directly through radiative forcing, increasing carbon dioxide concentration influences the climate system…”
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What Are the Main Causes of Positive Subtropical Low Cloud Feedbacks in Climate Models? by Webb, Mark J., Lock, Adrian P., Ogura, Tomoo

“…We investigate positive subtropical low cloud feedback mechanisms in climate models which have performed the CMIP6/CFMIP‐3 AMIP and AMIP uniform +4K…”
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Climate model errors, feedbacks and forcings: a comparison of perturbed physics and multi-model ensembles by Collins, Matthew, Booth, Ben B. B, Bhaskaran, B, Harris, Glen R, Murphy, James M, Sexton, David M. H, Webb, Mark J

“…Ensembles of climate model simulations are required for input into probabilistic assessments of the risk of future climate change in which uncertainties are…”
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Prospects for narrowing bounds on Earth's equilibrium climate sensitivity by Stevens, Bjorn, Sherwood, Steven C., Bony, Sandrine, Webb, Mark J.

“…The concept of Earth's Equilibrium Climate Sensitivity (ECS) is reviewed. A particular problem in quantifying plausible bounds for ECS has been how to account…”
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Multivariate probabilistic projections using imperfect climate models part I: outline of methodology by Sexton, David M. H., Murphy, James M., Collins, Mat, Webb, Mark J.

“…We demonstrate a method for making probabilistic projections of climate change at global and regional scales, using examples consisting of the equilibrium…”
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Mechanisms for the land/sea warming contrast exhibited by simulations of climate change by Joshi, Manoj M, Gregory, Jonathan M, Webb, Mark J, Sexton, David M. H, Johns, Tim C

“…The land/sea warming contrast is a phenomenon of both equilibrium and transient simulations of climate change: large areas of the land surface at most…”
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The Relationship between Land–Ocean Surface Temperature Contrast and Radiative Forcing by Lambert, F. Hugo, Webb, Mark J., Joshi, Manoj M.

“…Previous work has demonstrated that observed and modeled climates show a near-time-invariant ratio of mean land to mean ocean surface temperature change under…”
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