Thursday October 18, 2018

Over 627,000 people die prematurely due to particulate air pollution

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By Newsgram Staff Writer

Over 627,000 people die prematurely and 18 million healthy life years are lost every year due to particulate air pollution Sunita Narain, director general of the Centre for Science and Environment (CSE) said at the Anil Agarwal Dialogue held in memory of CSE’s founder Anil Agarwal in the national capital today. She said that despite decades of air quality management,  particle pollution remains one of the top killers.

Particle pollution is the microscopic solid and liquid matter suspended in the Earth’s atmosphere. It is mostly black carbon, which is a product of incomplete combustion.

“Black carbon is local air pollutant and has global impact as well. The issue to deliberate will be the emerging science on local-global pollutants and also to understand the national road maps for intervention in key areas of mitigation and to see if these are sufficient or transformational approaches are needed,” Narain said.

The two-day event, that began on Wednesday, had discussions on black carbon and its impact of the climate.

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Earth’s Melting Ice Can Now Be Tracked By The Satellite That NASA Is Launching

The ICESat-2 will zoom above the planet at 7 km per second (4.3 miles per second), completing an orbit around Earth in 90 minutes.

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NASA, space
NASA's Chandra Observatory back in action. Pixabay

NASA is set to launch its Ice, Cloud and land Elevation Satellite-2, or ICESat-2 — that will track Earth’s melting poles and disappearing sea ice — on Saturday.

The satellite with a three-year mission is scheduled to launch at 8.46 a.m. EDT on September 15, with liftoff aboard a Satellite Delta II rocket from Space Launch Complex-2 (SLC-2), the US space agency said in a blog post late on Tuesday.

ICESat-2 is the NASA’s most advanced laser instrument — the Advanced Topographic Laser Altimeter System, or ATLAS.

It measures height by precisely timing how long it takes individual photons of light from a laser to leave the satellite, bounce off Earth and return to the satellite.

NASA, Polar Ice
ICESat-2 will measure the average annual elevation change of land ice covering Greenland and Antarctica. Flickr

The satellite will provide critical observations of how ice sheets, glaciers and sea ice are changing, leading to insights into how those changes impact people where they live, NASA said.

ICESat-2’s orbit will make 1,387 unique ground tracks around Earth in 91 days and then start the same ground pattern again at the beginning.

While the first ICESat satellite (2003-09) measured ice with a single laser beam, ICESat-2 splits its laser light into six beams making it better to cover more ground (or ice).

The arrangement of the beams into three pairs will also allow scientists to assess the slope of the surface they are measuring, NASA said.

NASA
ICESat-2 is the NASA’s most advanced laser instrument Pixabay

Further, the ICESat-2 will zoom above the planet at 7 km per second (4.3 miles per second), completing an orbit around Earth in 90 minutes. The orbits have been set to converge at the 88-degree latitude lines around the poles, to focus the data coverage in the region where scientists expect to see the most changes.

Also Read: AI Helps Find Source Of Radio Bursts 3 Billion Light Years Away From Earth

All of those height measurements result from timing the individual laser photons on their 600-mile roundtrip between the satellite and Earth’s surface – a journey that is timed to within 800 picoseconds, NASA said. (IANS)

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