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New methodology improves winter climate forecasting

Date:
July 21, 2010
Source:
North Carolina State University
Summary:
It's hot out right now, but new research will help us know what to expect when the weather turns cold. Researchers have developed a new methodology that improves the accuracy of winter precipitation and temperature forecasts. The tool should be valuable for government and utility officials, since it provides key information for use in predicting energy consumption and water availability.

Researchers were able to reduce uncertainty in winter climate predictions by developing a methodology that incorporates multiple climate forecast models and also accounts for the activity of El Nino conditions in the Pacific.
Credit: Image courtesy of North Carolina State University

It may be hot out right now, but new research from North Carolina State University will help us know what to expect when the weather turns cold. Researchers have developed a new methodology that improves the accuracy of winter precipitation and temperature forecasts. The tool should be valuable for government and utility officials, since it provides key information for use in predicting energy consumption and water availability.

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"Predicting winter precipitation is extremely useful, because winter is the most important season in terms of re-charging water supplies in the United States, ensuring water will be available in the summer," says Dr. Sankar Arumugam, author of the study and an assistant professor of civil, construction and environmental engineering at NC State. The study was co-authored by Naresh Devineni, a Ph.D. student at NC State.

"Predicting temperature is also important, because temperature determines energy consumption," Arumugam says. "When it is very cold, people use more energy to heat their homes."

The researchers were able to reduce uncertainty in winter climate predictions over the United States by developing a methodology that incorporates multiple general climate forecast models (GCMs) and also accounts for the activity - or inactivity - of El Nino conditions in the Pacific.

Winter precipitation and temperature over many regions of the continental United States are predominantly determined by the El Nino Southern Oscillation (ENSO), which denote hot (El Nino) or cold (La Nina) sea surface temperature conditions in the tropical Pacific.

Most GCMs are better at predicting the winter climate when ENSO is quite active, and are less accurate under neutral ENSO conditions. The methodology developed by the researchers accounts for the skill of the models under active and neutral ENSO conditions in combining multiple GCMs, resulting in reduced uncertainty in predicting the winter climate.

"Improving precipitation and temperature predictions should help government, water and energy utility officials plan more effectively," Arumugam says, "because they will have a better idea of what conditions to expect."

The study, "Improving the Prediction of Winter Precipitation and Temperature over the continental United States: Role of ENSO State in Developing Multimodel Combinations," was published online this month by Monthly Weather Review. The research was funded by the North Carolina Water Resources Research Institute.

NC State's Department of Civil, Construction and Environmental Engineering is part of the university's College of Engineering.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Devineni et al. Improving the Prediction of Winter Precipitation and Temperature over the Continental United States: Role of the ENSO State in Developing Multimodel Combinations. Monthly Weather Review, 2010; 138 (6): 2447 DOI: 10.1175/2009MWR3112.1

Cite This Page:

North Carolina State University. "New methodology improves winter climate forecasting." ScienceDaily. ScienceDaily, 21 July 2010. <www.sciencedaily.com/releases/2010/07/100720101343.htm>.
North Carolina State University. (2010, July 21). New methodology improves winter climate forecasting. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2010/07/100720101343.htm
North Carolina State University. "New methodology improves winter climate forecasting." ScienceDaily. www.sciencedaily.com/releases/2010/07/100720101343.htm (accessed December 20, 2014).

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