Palmer and Pearson, 2003 (23,000 year record of water pH and PCO2)

Question 1

Boron isotope studies of planktonic foraminifera from the Western Equatorial pacific show that this area was a strong source of … to the atmosphere between … and … years ago.

Answer 1

CO2, 13,800, 15,600

Question 2

This observation is suggested to be due to increased frequency of … … conditions during this interval.

Answer 2

La Niña (cooling of surface ocean waters)

Question 3

Hence, increased … in the eastern equatorial pacific may have played an important role in the rise in atmospheric CO2 during the last deglaciation

Answer 3

upwelling