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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.

Also Read: Space station crew will experience New Year’s Eve 16 times, says NASA

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.

Also Read: NASA’s Kepler Discovers Nearly 100 New Exoplanets

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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Ozone-Depleting Substance Causes Half of Arctic Warming

Ozone-depleting substances behind half of Arctic warming

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Arctic warming
Ozone-depleting substances caused half of Arctic warming and sea ice loss. Pixabay

Ozone-depleting substances caused half of Arctic warming and sea ice loss from 1955 to 2005, causing about a third of all global warming during that period, reveals a significant study.

A scientific paper published in 1985 was the first to report a burgeoning hole in Earth’s stratospheric ozone over Antarctica.

The discovery left scientists into a huddle to determine the cause which happened to be ozone-depleting substances – long-lived artificial halogen compounds entirely manmade and popularly used as refrigerants, solvents and propellants.

The new study from researchers at Columbia University and published in the journal Nature Climate Change examined the greenhouse warming effects of ozone-depleting substances (ODS).

Arctic warming
Ozone-depleting substances act as a strong supplement to carbon dioxide and had lead to Arctic warming. Pixabay

It found that the ozone-depleting substances acted as a strong supplement to carbon dioxide, the most pervasive greenhouse gas. “We showed that ODS have affected the Arctic climate in a substantial way,” said researcher Michael Previdi from Lamont-Doherty Earth Observatory.

The scientists reached their conclusion using two very different climate models that are widely employed by the scientific community, both developed at the US National Center for Atmospheric Research. The results highlight the importance of the Montreal Protocol, which has been signed by nearly 200 countries.

“Climate mitigation is in action as we speak because these substances are decreasing in the atmosphere, thanks to the Montreal Protocol,” said Lorenzo Polvani, lead author of the study. “In the coming decades, they will contribute less and less to global warming. It’s a good-news story”.

In the 1980s, a hole in Earth’s stratospheric ozone layer, which filters much of the harmful ultraviolet radiation from the sun, was discovered over Antarctica. Scientists quickly attributed it to ODS. The world sprang into action, finalizing a global agreement to phase out ODS.

Also Read- Increase in Diabetes and Thyroid in India in 2019: Report

The Montreal Protocol was signed in 1987 and entered into force in 1989. Due to the swift international reaction, atmospheric concentrations of most ODS peaked in the late 20th century and have been declining since.

However, for at least 50 years, the climate impacts of ODS were extensive, revealed the new study. (IANS)