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Meteorological Technology International
Rainfall

Institutes in Australia collaborate to use GPS for more accurate rain forecasts

Helen NormanBy Helen NormanOctober 23, 20192 Mins Read
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The Royal Melbourne Institute of Technology (RMIT) University, Geoscience Australia and Bureau of Meteorology (BoM) have collaborated to use the growing network of GPS receivers to provide more accurate, real time weather forecasts.

GPS signals can be slightly delayed on their journey from satellites to Earth by moisture in the troposphere, causing what’s known as a zenith total delay. Scientists now know how to use precise measurements of this delay to accurately calculate air moisture and likely rainfall.

Following successful trials across Australia, the method is now part of BoM’s weather forecast models. RMIT adjunct professor and BoM senior principal research scientist, John Le Marshall, said it was an exciting new capability for real-time weather measurements and forecasting.

“Atmospheric water vapour is highly variable yet vital to accurate analysis and weather forecasting,” he explained. “The development of a GPS-based system to improve moisture analysis and forecasting over Australia is therefore an exciting step toward improved humidity and rainfall forecasting.”

GPS is proving increasingly useful to meteorologists, with another completed project using the bending of GPS signals through the atmosphere to determine temperature at various altitudes.

Le Marshall said while the technology could be applied almost anywhere, it was particularly valuable in a sparsely populated country like Australia with its lack of ground-based meteorological observation stations.

“Weather forecasting is dependent on accurate atmospheric observations, but the limited stations we can draw measurements from across our vast continent has always been an issue,” he said.

“With this technology we were able to tap into an Australia-wide network of 256 GPS receiving stations, and that number of stations is set to continue increasing over coming years.”

A study of the latest system was recently been published in Journal of Southern Hemisphere Earth Systems Science.

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