Author: postMigrator

Scientists have been citing evidence of links between greenhouse
forcing and the stratospheric ozone shield for some years. Here’s one
more.
Lance

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“The supercomputer modeling effort also indicated that ozone hole
recovery would weaken the intense westerly winds that currently whip
around Antarctica and block air masses from crossing into the
continent’s interior. As a result, Antarctica would no longer be
isolated from the warming patterns affecting the rest of the world.”
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Public release date: 24-Apr-2008
University of Colorado at Boulder

Contact: Judith Perlwitz
judith.perlwitz@noaa.gov
303-497-4814

Ozone hole recovery may reshape southern hemisphere climate change
A full recovery of the stratospheric ozone hole could modify climate
change in the Southern Hemisphere and even amplify Antarctic warming,
according to scientists from the University of Colorado at Boulder,
the National Oceanic and Atmospheric Administration and NASA.

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http://www.space.com/scienceastronomy/080424-am-jurassic-warming.html

“During the Jurassic, abrupt global warming of between 9 and 18
Fahrenheit (5 and 10 degrees Celsius) was associated with severe
environmental change. Many organisms went extinct and the global
carbon cycle was thrown off balance. One of the most intriguing
effects was that the oxygen content of the oceans became drastically
reduced, and this caused many marine species to die off.

“These intervals of reduced oxygen content in the oceans are now
known as oceanic anoxic events, or OAEs. OAEs are associated with
periods of global warming and have occurred a few times in Earth’s
history. In the recent study, researchers focused specifically on the
Toarcian OAE, a well-documented OAE from the early Jurassic.

“During OAEs, the remains of dead organisms and other organic matter
accumulate on the ocean floor and became layers of organic-rich
sediments. Today, scientists are examining the chemical and isotopic
compositions of these sedimentary deposits in order to determine the
actual extent to which the oceans became anoxic. By doing so, they
have been able to draw connections between oxygen-depleted oceans and
the disruption of Earth’s carbon cycle.”

http://www.space.com/scienceastronomy/080424-am-jurassic-warming.html
“The structural relations within and between human societies
and their environments form the most complex systems
known to science.”

Charles D. Laughlin and Ivan Brady, editors,
Extinction and Survival in Human Populations
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“Making connections is the essence of scientific progress.”

Chris Quigg, “Aesthetic Science,”
Scientific American, April 1999
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Bears will see varied influence of changing distribution of trees.
For example, although the implications may not be perfectly clear,
polar bears will be shifting southward off the ice and onto the land
at the same time that spruce will be shifting northward, plausibly
shading the ground enough to select for or against the understory
species that might be polar bears’ future food base.
Lance

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http://www.sciencedaily.com/releases/2007/12/071203090131.htm
Climate Change Predicted To Drive Trees Northward

ScienceDaily (Dec. 3, 2007) – The most extensive and detailed study
to date of 130 North American tree species concludes that expected
climate change this century could shift their ranges northward by
hundreds of kilometers and shrink the ranges by more than half. The
study is by Daniel W. McKenney of the Canadian Forest Service and his
colleagues. Ranges may decrease sharply if trees cannot disperse in
altered conditions.

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