Solar has its largest influence in the lower stratosphere (
including changes in jet stream position), CO2 in the lower troposphere.
Not exact matches
Those
changes may
include the loss of Arctic summer sea ice, the collapse of ice sheets
in Greenland and western Antarctica, dieback of the Amazon rainforest and
changes in the
jet stream and the pattern of El Niño and La Niña weather cycles.
The
changes in the atmospheric circulation
include things like a stronger subtropical
jet stream.
As I describe
in that article the weather systems on Earth (primarily the
jet streams and the high pressure cells either side of them) ramp up their thermal efficiency
in tune with the scale of any positive or negative energy input
changes from any source
including that from human CO2.
The previous suggested reason was that climate
change was shifting storms and the powerful air currents known as the
jet streams —
including the one that traverses the United States — toward the poles, which
in turn were driving the movement of the clouds.
Further adding to the divide within the climate science community is the fact that many of the climate models that Trenberth and others often use do not show the sorts of
changes in the
jet stream that the new study and others like it have pointed to,
including the more frequently stagnated or «blocked» weather patterns that Francis cited.
While climate
change does not affect Earth's tilt, it does have potential implications for many of the other factors that influence winter weather
in the US,
including Arctic sea ice, the polar
jet stream, the polar vortex, and El Niño.