#  ClimaTea Journal Club 

 



####  calendar\_today Date and Time 

 **February 13, 2018** 

 03:00PM - 03:00PM EST 

####  pin\_drop Location 

 **Seminar Room MCZ, 429**  



 

 



 

 Speaker: Judy Pu

 Judy will lead the discussion on the Snowball Earth climate dynamics and Cryogenian and she lead us through the following key points:

- Geological evidence shows that ice from polar regions reached equatorial latitudes at least twice in Earth history during the Cryogenian Period (720-635 Ma).
- High-precision geochronology, paleomagnetism, and climate modeling support globally synchronous deglaciation for both snowball periods, but onset age and duration of the later Marinoan snowball Earth remain unclear.
- The snowball Earth periods were times of dynamic glaciers and ice sheets in a cold and dry climate state, with possible reversal of the annual mean tropical atmospheric circulation.
- Trigger mechanisms and reasons for the drastic difference in duration between the two Cryogenian snowball Earth events are still uncertain.



 

 

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 Attachments- [  picture\_as\_pdf  hoffman\_etal\_sciad\_2017.pdf ](/sites/g/files/omnuum11466/files/climate/files/hoffman_etal_sciad_2017.pdf)
 
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 See also:- [ ClimaTea ](/type-event/climatea-lecturejournal-club)
 
 

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