intensified warming of the arctic: causes and impacts on...
Post on 02-Jun-2020
7 Views
Preview:
TRANSCRIPT
Intensified warming of the Arctic: Causes and impacts on middle latitudes
Global and Planetary ChangeJohn E. Walsh
Outline
• Current status update of Arctic
• Drivers and mechanisms of Arctic change
• Impacts on middle latitudes
• Conclusion
Degree (C)
Annual mean change of surface air temperature in the northern hemisphere over the last 50 years
Less IceLess reflective surface area
=
More heat absorbed and released by the ocean
Sea Ice Albedo Feedback
Less IceIncreased atmospheric moisture
Increases Downwelling radiation
Warms lower Troposphere
Water vapor/Infrared feedback loop
Atm
osp
her
ic P
ress
ure
(m
b)
Atm
osp
her
ic P
ress
ure
(m
b)
Atm
osp
her
ic P
ress
ure
(m
b)
top related