Japan launches precipitation-measuring satellite in bid to understand world’s weather

February 28, 2014

Following weeks of extreme and highly unpredictable weather all over the world, the launch of a new “precipitation measuring” satellite means we may from now on be more prepared…

Japan has successfully launched a rocket carrying a satellite built to track global rain- and snowfall, according to the Japan Aerospace Exploration Agency (JAXA). The US-built “Global Precipitation Measurement Core Observatory” launched at 3.37am (Japan Standard Time) on Friday 28th February from the Tanegashima Space Center in southern Japan.  The satellite is part of an international initiative to help us better understand the world’s water cycle and its relationship to storms, droughts and climate change, and is designed to help meteorologists more confidently predict extreme weather such as storms and typhoons.

Steve Neeck, NASA’s deputy associate administrator for Earth science flight programs, said of the project:

“Why are we flying GPM? Rain and snowfall affect our daily lives in many ways … The distribution of precipitation … directly affects the availability of fresh water for sustaining life. Extreme precipitation events like hurricanes, blizzards, floods, droughts and landslides have significant socio-economic impacts on our society.”

Indeed, after months of volatile weather, including deadly snowfall in Japan, severe flooding in the UK and a life-threatening Arctic freeze in the US, the promise of a more comprehensive weather observation system could not come at a better time.

The mission to launch the GPM Core satellite has been in place for over a decade. As a continuation of the Tropical Rainfall Measuring Mission, which began in November 1997, GPM will, among other uses, improve the resolution of images gathered by the TRMM satellite.

JAXA, the Japanese Space Agency, and NASA, have collaborated on the project and together have invested over $1.2 billion creating the sophisticated technology.

Designed and built at NASA’s Goddard Space Flight Center in Maryland, the GPM Core satellite weighs more than four tons fully fueled. It hosts two instruments to peer inside storms and through cloud layers from an altitude of more than 250 miles, acting like an X-ray for the clouds.

One of the instruments, the Dual-frequency Precipitation Radar provided by the Japan Aerospace Exploration Agency, will scan the planet to acquire three-dimensional views of rain and snow showers.

The other, NASA’s GPM Microwave Imager, or GMI, built by Ball Aerospace and Technologies Corp. will measure the total precipitation suspended inside clouds and falling to Earth.

“The GMI will sense the total precipitation within all cloudlayers, including, for the first time, light rain and snowfall,” Neeck said. “The DPR will make detailed three-dimensional measurements of precipitation structures and rates as well as particle drop size.”

The information gathered by the Observatory will fill gaps in precipitation data over oceans, remote land masses and other undeveloped regions.

The spacecraft is set to become the centrepiece of a worldwide program to synthesize observations from disparate international satellites into a database of global rainfall and snowfall, which will be accessible every three hours.

Researchers plan to use data from the GPM Core Observatory to calibrate microwave measurements gathered from the network of already-flying international satellite missions (developed by the United States, Japan, France, India and Eumetsat, the European weather satellite agency), creating a uniform dataset scientists can rely on in their work.

“When scientists incorporate data from the international fleet, they can get a snapshot of all precipitation on Earth every three hours” said Gail Skofronick-Jackson, NASA’s deputy GPM project scientist.

In this way, said Riko Oki, JAXA’s lead scientist in the project, the data recorded by GPM Core Observatory “will be to the benefit of all.”

Sources include: space.com; The Japan Times


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