Sentences with phrase «model parameterizations of»

As it is, the model parameterization of clouds just plain sucks.

Wang, T. Vukicevic, G. Leoncini, T. Matsui, C. Castro, D. Niyogi, C.M. Kishtawal, A. Biazar, K. Doty, R.T. McNider, U. Nair, and W.K. Tao, 2007: Satellite - based model parameterization of diabatic heating.

Not exact matches

This technique lays the foundation for much improved parameterizations of climate change and global vegetation models, which will tell what the future holds in store.

Hoose, C. et al. (2010): A classical - theory - based parameterization of heterogeneous ice nucleation by mineral dust, soot, and biological particles in a global climate model, J. Atmos.

Uncertainties in the hydrological cycle due to land surface parameterizations can be divided into uncertainties from the spatial distribution of vegetation and from the model parameter values.

The team included a parameterization to represent irrigation in the Noah land surface model applied in WRF, and conducted a series of simulations with and without irrigation over the SGP for an extremely dry year (2006) and wet year (2007).

Unfortunately, many of these cloud properties must be estimated through parameterization, a technique used to represent complex small - scale systems, because climate model resolution is too coarse to resolve small - scale cloud features.

They compared the empirical data to the model simulations of the MJO, where much of the MJO processes are currently represented with parameterizations, a way to express complex climate systems in a computationally efficient way.

This finding enabled a complete thermodynamic budget analysis of the wave and identified the limitations of the model parameterization.

Parameterizations of cloud microphysics, cumulus clouds, and aerosol - cloud interactions in regional / global climate models

Mission The mission of PNNL's Aerosol Climate Initiative is to advance the current scientific understanding and parameterization of aerosol processes and properties to improve comprehensive climate modeling frameworks and to inform policy decisions related to global climate change and the environmental impacts of aerosols.

Knutson, T.R., and R.E. Tuleya, 2004: Impact of CO2 - induced warming on simulated hurricane intensity and precipitation: Sensitivity to the choice of climate model and convective parameterization.

Tompkins, A., 2002: A prognostic parameterization for the subgrid - scale variability of water vapor and clouds in large - scale models and its use to diagnose cloud cover.

Nakano, H., and N. Suginohara, 2002: Effects of bottom boundary layer parameterization on reproducing deep and bottom waters in a World Ocean model.

Liu, J., et al., 2003: Sensitivity of sea ice to physical parameterizations in the GISS global climate model.

For example one ocean ecosystem model that I know is used in at least one GCM does not include any sort of parameterization related to ocean acidity.

The Cloud, Aerosol, and Complex Terrain Interactions (CACTI) experiment in the Sierras de Córdoba mountain range of north - central Argentina is designed to improve understanding of cloud life cycle and organization in relation to environmental conditions so that cumulus, microphysics, and aerosol parameterizations in multi-scale models can be improved.

For instance, models with different parameterization strategies give very different estimates of the amount of carbon dioxide in the atmosphere necessary to raise Earth's surface temperature by 2 °C — with critical implications for policy decisions.

Thus, parameterizations, efficient ways to represent complex processes in climate models, have been constructed to capture the essence of cloud physics at a much lower computational cost.

He is leading projects investigating the impacts of snow and ice impurities on climate and water resources, and the aerosol sub-grid progress and parameterizations in climate models.

It seems a little odd to validate the models only at a seasonal macro scale after adjusting small scale parameters since that would aggregate the effect of parameterizations across large scale pattern changes within each season and make it impossible to determine cause and effect.

This action is simulated more explicitly in RCMs and more implicitly in GCMs by their parameterization schemes, but it is still not really known if these two levels of modelling provide a physically consistent picture of the scale interactions.

Further, recent work shows that ECS of a model can be largely tuned using details of the tropical convection and cloud parameterizations.

Has there been any success with models that would attempt to model climate «directly» via some theoretically or otherwise justified parameterization of all weather?

Similarly, an underlying principle, if one exists, could take care of some multiscale phenomena in climate models, reducing the need for guessing parameterization schemes greatly while improving model quality.

Given that there is some irreducible imprecision in model formulation and parameterization, what is the impact of this imprecision?

Specializing in the parameterization of land - atmosphere exchange for use in Global Climate, Regional Mesoscale, and Local Cloud - Resolving numerical weather prediction models.

I create parameterizations of land - atmosphere interactions which are incorporated into climate models and numerical weather prediction models.

I haven't seen anything that very strongly supports the IRIS idea, but I do concur with one idea buried in the paper: that the parameterization of fractional cloud cover in GCM's is not based on very clear physical principles, and could operate in many different ways — some of which, I think, could make climate sensitivity considerably greater than the midrange model of the current crop.

The most important part of their work was to simulate the iris in a climate model by artificially tweaking the model's convective parameterization.

Given that the answer to this for atmospheric models is a resounding «NO» (particularly because of sub-grid scale processes which need to be effectively pre-ordained through parameterizations), and given that oceanic circulations have much longer adjustment time scales, yet also have much more intense small scale (gyre) circulations than the atmosphere, my instinct is that we are not even close to being able to trust ocean models without long term validation data.

In super-parameterized climate models, thousands of embedded idealized two - dimensional cloud process - resolving model arrays are used to calculate sub-grid cloud and boundary layer adjustments to resolved dynamics, instead of conventional statistical parameterizations.

Knutson & Tuleya (2004) Impact of CO2 - Induced Warming on Simulated Hurricane Intensity and Precipitation: Sensitivity to the Choice of Climate Model and Convective Parameterization, J. Clim.

... A new sea - ice albedo parameterization scheme has been developed and implemented in ECHAM5 general circulation model, and includes important components like albedo decay due to snow aging, ice thickness dependency and an explicit treatment of melt pond albedo.

The main objective of the Action is to evaluate and improve our ability to project the consequences of environmental change for European forests by addressing questions regarding data needs, scaling, parameterization, and predictive accuracy of forest models.

The Cloud, Aerosol, and Complex Terrain Interactions (CACTI) field campaign in the Sierras de Córdoba mountain range of north - central Argentina is designed to improve understanding of cloud life cycle and organization in relation to environmental conditions so that cumulus, microphysics, and aerosol parameterizations in multiscale models can be improved.

This research has demonstrated that the new convection parameterization improves the simulation of the diurnal cycle of convection over land areas in the CAM model.

Thomas R. Knutson and Robert E. Tuleya, «Impact of CO2 - Induced Warming on Simulated Hurricane Intensity and Precipitation: Sensitivity to the Choice of Climate Model and Convective Parameterization,» Journal of Climate, vol.

To learn more about the development and application of improved physical parameterizations for global models, please contact us.

Now on to the interpretive part of that paragraphs: yes, to match real earth climate data, if a) you have a given model (say GISS II) with coded physics, with parameterization for physcial processes.

«The Sensitivity of Monsoon Climates to Orbital Parameterization Changes for 9000 Years BP: Experiments with the NCAR General Circulation Model.»

Without that theory, it is difficult to construct more accurate parameterizations [or models] of clouds that go into global climate models,» Romps said.

«Seasonal Simulation as a Test for Uncertainties in the Parameterization of a Budyko - Sellers Zonal Climate Model.»

General theory of cloud dynamics; parameterization of microphysics and radiation; models of fog, stratocumuli, cumulonimbi, and orographic clouds

However, if you compare regions like the hotter portion of the tropical oceans, there is still a bit of a discrepancy and even a hypothesis as to why the discrepancy may exist, convective triggering temperature which just one on many model «parameterizations» (SWAG).

Sensitivity of coupled tropical Pacific model biases to convective parameterization in CESM1, Journal of Advances in Modeling Earth Systems, 10, doi: 10.1002 / 2017MS001176.

Second, more accurate convective parameterization schemes, reasonable representation of the physical processes, and higher resolution are required in the reanalysis models.

For instance, models with different parameterization strategies give very different estimates of the amount of carbon dioxide in the atmosphere necessary to raise Earth's surface temperature by 2 °C — with critical implications for policy decisions.

This approach gets at the heart of the uncertainty that plagues today's models: a mathematical technique known as parameterization.

A fifth problem concerns the parameterization of the flowering date model.