By Paul Homewood
h/t Dave Ward
Emerging from the ice for a brief growing season every Antarctic summer, the lush green mosses of East Antarctica are finally succumbing to climate change.
That is according to a study of the small, ancient and hardy plants – carried out over more than a decade.
This revealed that vegetation in East Antarctica is changing rapidly in response to a drying climate.
The findings are published in the journal Nature Climate Change.
"Visiting Antarctica, you expect to see icy, white landscapes," said lead scientist Prof Sharon Robinson from the University of Wollongong, in Australia. "But in some areas there are lush, green moss beds that emerge from under the snow for a growing period of maybe six weeks."
While West Antarctica and the Antarctic Peninsula are some of the fastest warming places of the planet, East Antarctica has not yet experienced much climate warming, so the scientists did not expect to see much change in the vegetation there.
"But we were really surprised when we saw how fast it was changing," Prof Robinson said.
"After a pilot study in 2000, we set up monitoring in 2003. When we returned in 2008, all these green moss beds had turned dark red, indicating they were severely stressed. It was a dramatic change.
"They change from green to red to grey if they get really stressed.
"The red pigments are the sunscreen and drought stress protective pigments they produce to protect themselves – antioxidant and UV screening compounds.
"Grey means they are dying."
The scientists discovered evidence of a drying climate affecting the plants.
When their study started, the moss beds were dominated by a species called Schistidium antarctici, which can survive long periods under water. By 2013, many of the beds the team studied were being encroached by two other moss species that thrive in drier conditions and are less tolerant to being submerged.
East Antarctica, the researchers say, has become colder, windier and drier due to the combined effects of climate change and ozone depletion.
So, apparently, global warming now means the East Antarctic is getting colder!!
The research was undertaken near Casey Station, the Australian research centre. They have been recording temperatures since 1989, and there is no evidence of temperatures either going up or down:
And they are so concerned about precipitation that they have barely bothered measuring it since 2005. What information they have does not suggest Casey is getting drier.
The so called scientists have provided no proof that what they have observed is not simply short term weather events, which have no doubt happened millions of times in the past.
via NOT A LOT OF PEOPLE KNOW THAT
September 26, 2018 at 01:42PM