From: Bernard Appiah, SciDevNet, More from this Affiliate
Published February 21, 2013 08:16 AM

Mobile masts could help measure rain and chill vaccines

Mobile-phone masts in Africa could be used for other development initiatives, such as filling gaps in rainfall data and providing electricity to refrigerate vaccines, experts say.

For example, masts could be used to measure rainfall in areas without rain gauges, according to a study published in the Proceedings of the National Academy of Sciences (PNAS) this month (4 February).

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A general lack of rain gauges across Africa hinders countries' ability to monitor water resources and improve early warning systems that could save lives and cut the cost of flooding.

In the PNAS study, the researchers estimated average rainfall intensity from telecommunication network data for the Netherlands, taking advantage of the fact that rain causes signal losses between mobile-phone masts. They then compared these estimated rainfall maps with those generated from radar and rain gauges.

"There was a good match between the rainfall maps based on the mobile network and those based on the radar and rain gauge data," says lead author Aart Overeem, a hydrologist with Wageningen University in the Netherlands and the Royal Netherlands Meteorological Institute.

The researchers say their findings could be applicable in Africa and other places that lack a reliable network of rain gauges.

They hope their study will persuade mobile-phone companies to release relevant data freely for use in research and to measure rainfall.

But Overeem adds that the rain-measuring technique must be studied further both over a longer period and in places, such as the tropics, where mobile-phone masts often operate at lower radio frequencies. At such frequencies, there is a more complex relationship between rain and signal weakening that could affect the accuracy of rainfall maps.

A further application for mobile-phone towers could be to divert some of their electricity supply to cool vaccines, says Harvey Rubin, professor of medicine at the University of Pennsylvania in the United States and a director of Energize the Chain (EtC), an organisation that aims to set up this refrigeration.

The power for masts comes from generators, electricity companies or renewable energy sources such as the wind, which is paid for by mast operators.

As part of an EtC project in Zimbabwe, telecommunications firm Econet Wireless Zimbabwe has provided mast-cooled vaccine refrigerators at more than 100 sites, Rubin says, adding that the organisation will be focusing on India and Kenya next.

"Through the EtC initiative, it costs just 60 US cents a day to run one of the World Health Organization-approved vaccine refrigerators in remote villages," he says.

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Mobile mast image via Shutterstock.

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