New study: Antarctica has added 0.76 cm to sea level since 1992 ice extent has been increasing since 2009

New study: Antarctica has added 0.76 cm to sea level since 1992 ice extent has been increasing since 2009
New study: Antarctica has added 0.76 cm to sea level since 1992 ice extent has been increasing since 2009
Anonim

The current fervor of climate alarms could be completely undermined by the magnitude of the changes that have taken place in the Antarctic ice sheet in recent decades.

Here's a broader perspective.

The most alarming aspect of global warming is often cited as the threat of rising sea waters on the world's densely populated coasts, displacing hundreds of millions of people.

In 1989, as the UN was actively preparing to release the first report on human-induced global warming the following year, the prevailing alarmist view was that humans can control and "solve" the problem of the greenhouse effect on Earth (Associated Press, 1989).

The outlook was bleak as "entire countries could be wiped off the face of the earth by rising sea levels unless the trend towards global warming is reversed by the year 2000." In other words, "governments have a 10-year window of opportunity to tackle the greenhouse effect [1999] before it gets out of human control."

To illustrate the alarm over rising sea levels, scientists note that it will take “extended periods ranging from hundreds of thousands to millions of years” to cause even partial retreat of the Antarctic ice sheet (Nature Geoscience, 2018).

A 2007 IPCC report indicated that warming Antarctica would result in a net increase in mass and a decrease in sea level.

We recently learned that a "deep" cooling in East Antarctica has been occurring since the 1970s, and a cooling (-1.68 ° C since 1979) has spread to West Antarctica.

And now a new study shows that Antarctica contributed just 0.76 centimeters to sea level rise in 1992-2017, or 0.3 millimeters per year. In addition, when comparing 1997-2008 with 2009-2018, the last decade has seen a net increase in the area of ​​ice in Antarctica.

The surface temperature of the Southern Ocean over the past 2 decades has cooled by -0.5 ° C along East Antarctica and warmed by 0.5 ° C along West Antarctica and the peninsula.

None of these trends support the alarmist worldview about the current state of the climate.

Image source: Baumhoer et al., 2021.

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