How Atmospheric Sounding Transformed Weather Prediction

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#Météo , #Changements climatiques

Publié le 10 mai 2019

In the late 1950s, a scientist named Lewis Kaplan divined a new and groundbreaking way to calculate temperature in the atmosphere for weather forecasting: by measuring the vibration of molecules at different altitudes. The hope was to do this using a brand-new technology, an Earth-observing satellite.

Artist's rendering of the Nimbus-3 spacecraft. Credits: NASA

At the time, the only way to get a reading on atmospheric temperature was to dispatch high-altitude weather balloons, or radiosondes. Weather balloons collected critical information for weather forecasting. They still do today. But they required a lot of manpower; someone needed to fill each balloon with helium and release it, and they were sparse over the ocean. Hours often passed between measurements.

“Once you got out over the oceans, where there aren’t people to launch balloons, you were essentially in the dark, and weather forecasts weren’t very good,” said William Smith, professor emeritus at the University of Wisconsin, Madison, a distinguished professor at Hampton University in Hampton, Virginia, and a longtime leader in the field. “The satellite data was urgently needed to fill the gap over the oceans, and to fill in some of the time gaps.”

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