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Antarctic and global climate history viewed from ice cores by Edward Brook…
Antarctic and global climate history viewed from ice cores by Edward Brook
Bipolar Seesaw
Defined as a instance where Northern Hemisphere warming happens while the Southern Hemisphere cools
Driven by the Atlantic Meridional Overturning Circulation
Regulates climate variability over millennium.
Antiphasing of Greenland and Antarctic temperatures
Lag Time
Oxygen Isotopes in ice cores indicate temp changes over time periods
High oxygen isotope levels indicate warmer time periods and low oxygen isotope levels suggest cold time periods
There is a delay in oxygen isotope signals between hemispheres
What does this tell?
Temp shifts don't occur at the same time
Phasing
Timing between temp signals in both hemispheres
Northern/southern Hemi lag time
Lag can be 1kya-2kya
Southern Hemisphere lags after the Northern Hemisphere
Heat distribution changes are important for overall climate understanding
Warming observed in the Northern Hemi
Southern Hemi takes longer to respond to climate forcing
Role of AMOC
AMOC redistributes heat
can be sensitive to freshwater input
Can influence lag time
AMOC slows down when there is increased freshwater input,
Glaciers can input freshwater
The seesaw like pattern transfers warming and cooling to balance the difference