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Scientists Find Antarctica’s Rapidly Cooling, Ice-Sheet Melt Natural, Not CO2

by Kenneth Richard
July 16, 2019, 8:00 AM
in News and Opinion
Reading Time: 3 mins read
A A
7

Natural variability rules in Antarctica. Scientists have identified clouds, wind, and localized solar heating – not CO2 – as the factors driving ice melt; rising CO2 leads to Antarctic cooling.

Antarctica rapidly cooling in recent decades

In a review of the scientific literature, Lüning et al. 2019 report Antarctica as a whole has undergone a cooling trend in recent decades.

The Antarctic Peninsula has cooled at a rate of -0.5°C per decade since the late 1990s.

West Antarctica as a whole has “slightly cooled” (or the warming has “plateaued”) over the past two decades.

East Antarctica “has not experienced any significant temperature change since the 1950s” with ice sheet mass gains and cooling during the past 15 years.

Image Source: Lüning et al. 2019

Rising CO2 leads to Antarctic cooling

Antarctica contains about 90% of the world’s ice.

Because the continent averages -28.2°C in summer and -60°C in winter, inducing even partial retreat for an ice sheet that averages 2.3 kilometers in height would require a substantial amount of heat energy.

This effectively rules out a human influence.

According to scientists, raising CO2 concentrations does not even lead to warming in Antarctica. Actually, scientists find Antarctica cools in response to rising CO2 concentrations, which means we humans may be contributing more to ice mass gains than to losses.

Image Source: Schmithüsen et al., 2015

Natural variability – clouds, wind, localized solar heating – drive Antarctic ice melt

The surface melting of portions of the West Antarctic Ice Sheet (WAIS) has received quite a bit of attention in media circles, often accompanied by scary warnings of ice sheet collapse and catastrophic sea-level rise.

For example, Dr. James Hansen – admitting his doomsday predictions are tendentiously designed to be “persuasive” – has claimed sea levels will rise by 10 feet by 2065 mostly due to Antarctic ice sheet melt.

Image Source: Slate

These harrowing warnings often seem to arise in response to observations of glacier calving events – large glaciers fissuring and breaking off from the ice sheet.

But glaciologists know that calving events are indicative of ice sheet thickening, not thinning. Glaciers calve when the ice accumulation has become so heavy and thick that the base of the ice sheet can no longer bear the load.

Image Source: Christmann et al., 2016

Yes, portions of Antarctica are undergoing ice melt. But any ice sheet recession and advancement are both natural. And modern ice melt is well within the range of what occurs naturally for Antarctica.

Indeed, as Jones et al. (2016) conclude, natural variability “overwhelms” any forced response in satellite era trend observations.

Image Source: Jones et al., 2016

In two new papers, scientists identify the natural mechanisms driving the recession of some of West Antarctica’s glaciers in recent decades.

Scott et al. (2019) conclude surface melt is driven by wind currents and downwelling longwave radiation from clouds.

Stewart et al. (2019) find localized solar heating of surface water can explain melting in small portions of the Ross Ice Shelf.

Considering the total Antarctic meltwater contribution to sea level rise may only amount to 0.34 of a centimeter since 1958 (Frederikse et al., 2018), it is quite reasonable to conclude that nothing unusual, unprecedented, or concerning is occurring in Antarctica that could be said to fall outside the range of natural variability.

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Comments 7

  1. Dave of Reedy Creek, Qld. Aust says:
    6 years ago

    I am reasonable sure after reading articles for several years that Antarctic melting is caused by volcanic activity. In fact, it is quite obvious that volcanoes, both under sea and on land ones spew out huge amounts of material that cause part of our climate cycles. Don’t think I have ever read of Gore, Flannery and a myriad other lefty/greenie/commos ever mention them. Obviously it’s an “inconvenient truth”. It was volcanoes in the past that caused “the years with no summer.”

  2. Francois Marechal says:
    6 years ago

    Very good read. Particularly like the links to other articles provided.
    Thanks

  3. Boxorox says:
    6 years ago

    Even if we were to assume that warming in Antarctica is occurring for any reason, as long as the ice remains below the melting point, it remains frozen.

  4. Amber says:
    6 years ago

    Why don’t the Hollywood blow hards move to Antarctica ? Maybe just a little to real . How does a guy that left politics with peanuts put 4 of his kids through Harvard ? Who says there is no money in hot air ?

  5. Dave O says:
    6 years ago

    So let me try to put a media bias twist to this story:
    Global Warming has led to cooling in the Antarctic. And all you people who don’t believe this are science deniers.

  6. Spurwing Plover says:
    6 years ago

    Greenpeace and all their poppycock about melting ice caps proves their wrong i mean look at the Ice caps as shrinking and expanding the Penguins and Arctic Terns see more ice then dose any other living things and the Ice Cap on Mars shrinks and expands with the Martian Seasons

  7. Spurwing Plover says:
    6 years ago

    P

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