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Climate change driving dramatic rise in sea levels: NASA

The researchers said that the speed of the acceleration can be affected by geological events such as volcanic eruptions or by climate patterns such as El Nino and La Nina

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This year NASA discovered few earth like planets. Wikimedia Commons
This year NASA discovered few earth like planets. Wikimedia Commons
  • Sea levels are at the risk of rising due to rapid climate change
  • Sea levels are expected to rise twice as high by 2100
  • It is now high time we do something about the climate change

The sea level may rise twice as high by 2100 as previously estimated as a result of climate change, a new NASA study says.

According to the findings detailed in the journal Proceedings of the National Academy of Sciences, arise in sea level may increase by up to 65 centimetres in the next 80 years, enough to cause significant problems for coastal cities, Space.com reported on Friday.

ISS is a permanent base for astronauts stationed in the outer sky. Wikimedia Commons
Sea levels are rising due to climate change: NASA. Wikimedia Commons

“This is almost certainly a conservative estimate,” said Steve Nerem, Professor at the University of Colorado-Boulder, who led the NASA Sea Level Change team that conducted the study.

This acceleration has been driven mainly by increased ice melting in Greenland and Antarctica, the study said.

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The findings are based on 25 years of NASA and European satellite data.

Sea levels are constantly rising which is a matter of great concern. www.austradesecure.com
Sea levels are constantly rising which is a matter of great concern. www.austradesecure.com

“Our extrapolation assumes that sea level continues to change in the future as it has over the last 25 years. Given the large changes we are seeing in the ice sheets today, that is not likely,” Nerem said in a statement.

Rising concentrations of greenhouse gases in Earth’s atmosphere increase the temperature of air and water, which causes sea level to rise in two ways.

First, warmer water expands, and this “thermal expansion” of the ocean has contributed about half of the seven centimetres of global mean sea level rise that has been observed over the past 25 years, Nerem said.

Second, the water from melting land ice flows into the ocean, which also increases sea level around the world. The rate of sea level rise has risen from about 2.5 millimetres per year in the 1990s to about 3.4 millimetres per year today, the researchers said.

NASA
NASA constantly monitors climate change and its effects.

These increases have been measured by satellite altimeters since 1992, including the TOPEX/Poseidon, Jason-1, Jason-2, and Jason-3 missions, which have been jointly managed by NASA, France’s Centre national d’etudes spatiales, the European Organisation for the Exploitation of Meteorological Satellites, and the US National Oceanic and Atmospheric Administration.

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The researchers said that the speed of the acceleration can be affected by geological events such as volcanic eruptions or by climate patterns such as El Nino and La Nina.

They used climate models and other data sets to account for the volcanic effects and to determine the El Nino /La Nina effects, ultimately uncovering the underlying rate and acceleration of sea level rise. IANS

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NASA Making a ‘Rigorous’ Search for Vikram with Fresh Lunar Pictures

LRO will next fly around the region on November 10 and it will be another good opportunity with favourable lighting conditions for pictures, Petro said

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nasa, trump, moon mission
NASA also plans to build a space outpost in lunar orbit that can relay astronauts to the lunar surface by 2024. VOA

BY ARUL LOUIS

NASA’s Lunar Reconnaissance Orbiter (LRO) has taken a fresh set of pictures under better lighting conditions of the area where the Indian moon lander Vikram likely ended up and experts will be making a rigorous search for it, according to LRO Project Scientist Noah Petro.

“The lighting conditions on Monday were much more favourable, (with) less shadow in the region” compared to last month, Petro told IANS on Wednesday.

Scientists were not able to locate the Vikram in the pictures taken during the LRO’s last flyover on September 17, when it was dusk on the moon and the long shadows that covered much of the terrain may be hidden in it, NASA said at that time.

“We flew over the landing site on Monday and the camera team is still evaluating images, so we should know more in the next few days,” Noah said.

Chandrayaan 2, India, Moon
Chandrayaan-2, India’s ambitious expedition to the moon’s south pole, made headlines globally even as Vikram, the lander of the mission, lost contact with the orbiter. Pixabay

“We will do a careful search, we will be as rigorous as possible” and “we will find out soon” what happened to the Vikram moon lander, said Petro, who is based at the Goddard Space Flight Center in Maryland near Washington.

“This is a large area, we don’t know exactly where we have to look. So it will take some time to search the images because we are looking over a very, very large area,” he added.

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Vikram lost contact with the Indian Space Research Organisation (ISRO) following its launch from Chandraayan 2 moon orbiter on September 6 and likely landed in an area around the moon’s South Pole.

LRO will next fly around the region on November 10 and it will be another good opportunity with favourable lighting conditions for pictures, Petro said. (IANS)