Arctic Climate Under Greenhouse Conditions in the Late Cretaceous
Last Post
Science Centric | 8 July 2009 17:00 GMT
New evidence for ice-free summers with intermittent
winter sea ice in the Arctic Ocean during the Late
Cretaceous - a period of greenhouse conditions - gives
a glimpse of how the Arctic is likely to respond to
future global warming.
••[Since any future global warming is at least 90
thousand years off, how the arctic responds is
moot]
Records of past environmental change in the Arctic
should help predict its future behaviour. The Late
Cretaceous, the period between 100 and 65 million
years ago leading up to the extinction of the
dinosaurs, is crucial in this regard because levels of
carbon dioxide (CO2) were high, driving greenhouse
conditions.
•• [Since any description of the climate at any time
in the Cretaceous which includes 35 ice ages is
at best problematic~~ and mostly guesswork]
But scientists have disagreed about the climate at this
time, with some arguing for low Arctic late
Cretaceous winter temperatures (when sunlight is
absent during the Polar night) as against more recent
suggestions of a somewhat milder 15 C mean annual
temperature.
•• [they are both probably right sometimes and wrong
some times and but mostly wrong all of the time.
There is a lot of leeway in 35 million years]
- -
In real science the burden of proof is always on
the proposer, never on the sceptics. So far
neither IPCC nor anyone else has provided one
iota of valid data for global warming nor have
they provided data that climate change is being
effected by commerce and industry, and not by
natural phenomena.
Last Post
Arctic climate under greenhouse conditions in the Late Cretaceous
Science Centric | 8 July 2009 17:00 GMT
New evidence for ice-free summers with intermittent
winter sea ice in the Arctic Ocean during the Late
Cretaceous - a period of greenhouse conditions - gives
a glimpse of how the Arctic is likely to respond to
future global warming.
••[Since any future global warming is at least 90
thousand years off, how the arctic responds is
moot]
Records of past environmental change in the Arctic
should help predict its future behaviour. The Late
Cretaceous, the period between 100 and 65 million
years ago leading up to the extinction of the
dinosaurs, is crucial in this regard because levels of
carbon dioxide (CO2) were high, driving greenhouse
conditions.
•• [Since any description of the climate at any time
in the Cretaceous which includes 35 ice ages is
at best problematic~~ and mostly guesswork]
But scientists have disagreed about the climate at this
time, with some arguing for low Arctic late
Cretaceous winter temperatures (when sunlight is
absent during the Polar night) as against more recent
suggestions of a somewhat milder 15 C mean annual
temperature.
[ . . . ]