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AfricanClimate@Home


What is climate?

Climate is the average long-term pattern of weather activity over a region.

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What is a General Circulation Model (GCM)?

A GCM is a global, three-dimensional computer model of the climate system, which can be used to simulate the earth's climate. GCMs are highly complex and represent the effects of such factors as reflective and absorptive properties of atmospheric water vapor, greenhouse gas concentrations, clouds, solar heating, sea temperatures and ice boundaries. The most advanced GCMs include global representations of the atmosphere, oceans, and land surface.

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What is a Regional Circulation Model (RCM)?

A RCM is a comprehensive physical high resolution (less than 50km) climate model that covers a limited area of the globe, usually including the atmosphere and land surface components of the climate system, and containing representations of the important processes within the climate system (e.g., cloud, radiation, rainfall, soil hydrology).

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What are climate model parameters?

Climate model parameters are numbers that quantify certain factors in the rules of a climate model. Quantities related to land surface types such as vegetation, land, water, or amounts of atmospheric convection, etc. are examples of climate parameters. Climate model parameters also include the specification of factors that are not simulated but rather prescribed, such as the amount of rain from a given amount of humidity, wind and temperature.

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Why was this project just looking at Africa?

Africa is already vulnerable to extremes in climate, and current climate change projections suggest that the region will be more vulnerable in the future. Thus a climate study for this region is important both for economic reasons and for understanding future vulnerability. The climate modeling techniques developed here may be applied to other regions of the world in the future.

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Why did this project download and upload so much data?

Climate simulations require three-dimensional information about temperature, pressure, wind, humidity and surface properties for the entire region being studied at a detailed grid level. In addition, information arriving at the boundary of the region over the time span being studied is needed. This requires a considerable amount of input data, and as the simulation runs, a large quantity of output data is produced.

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What are the potential benefits of the "AfricanClimate@Home" project?

The project will lead to the identification of combinations of key parameterizations that best simulate the varying climates of Africa. More accurate models will give researchers a better understanding of the implications of various natural and man-made influences on the African climate. In turn, this will enable policy makers to make important adaptation and mitigation decisions based on the best available information.

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What computers can run the "AfricanClimate@Home" Project?

AfricanClimate@Home can run on computers that use a high speed internet connection and that run the Windows and Linux operating systems. AfricanClimate@Home will be available using the BOINC agent. You can check to see if you are using the BOINC agent by following the information available here. For system requirements, click here.

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What will World Community Grid's calculations produce?

World Community Grid will produce a significant amount of atmospheric and surface data that will be analyzed and interpreted by researchers to better understand the ability and constraints faced by models simulating African climate.

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What will happen with the data generated by all these calculations?

The generated data will eventually be released to the general scientific community, as well as others interested in doing non-commercial climate research over the African region.

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Why were there so many copies of a work unit sent out for AfricanClimate@Home?

Each computer that receives a work unit for AfricanClimate@Home will compute a two week period for the climate model based on the same starting conditions as other computers that receive a copy of the same work unit. The result data for AfricanClimate@Home is very large (greater then 100MB). Very few computers are able to return a result of this size. Therefore the result file is divided between each computer computing the work unit and each returns a unique section of the result file. Additional information is returned as well to ensure that the section of the result file returned is correct.

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Why do I have to opt into AfricanClimate@Home in order to participate?

The AfricanClimate@Home downloaded work unit size is anticipated to be approximately 77MB, which means it is approximately 150 times larger than a typical FightAIDS@Home or HPF2 work unit. Thus, a 756kbps network connection will take approximately 12-15 minutes to download the work unit. We have estimated that only about 33 percent of registered computers have enough bandwidth to be eligible to participate in this project.

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What version of WRF was being used for the AfricanClimate@Home project?

AfricanClimate@Home presently uses WRF Model Version 2.2 (December 2006). In addition, this project is not using the Chemistry model of WRF.

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When will this project be completed?

The first phase of the project ran through July, 2008.

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Screen saver/Graphics: What did the variable Temperature @ 2m on the right graph of the AfricanClimate@Home graphic represent?

The variable Temperature @ 2m represents the model simulated air temperature 2 meters above the ocean/land surface.

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Screen saver/Graphics: What did the variable Humidity @ 2m on the right graph of the AfricanClimate@Home graphic represent?

The variable Humidity @ 2m represents the model simulated absolute humidity (expressed as the mass of water vapor per kilogram of air) 2 meters above the ocean/land surface.

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Screen saver/Graphics: What did the variable Precipitation on the right graph of the AfricanClimate@Home graphic indicate?

It indicated the amount of rainfall simulated by the model at the surface.

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Screen saver/Graphics: What did the graph on the right side of the AfricanClimate@Home graphic represent?

It showed the change as time progresses in the mean value of Temperature/Humidity/Precipitation over the whole domain.

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Screen saver/Graphics: What did the map on the left side of the AfricanClimate@Home graphic represent?

The map on the left represented southern Africa with country boundaries. The island of Madagascar is on the right hand side of the map, which is derived from a blue marble image, courtesy of NASA's earth observatory. The shaded box represents the domain (boundaries) of the climate model, centerd on South Africa. Within that domain can be seen the model simulation of the local weather patterns.

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