Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age

Xingchen Tony Wang1, Daniel Mikhail Sigman2, Maria Prokopenko3, Jess F Adkins1, Laura F Robinson4, Sophia Hines1, Junyi Chai2, Anja S Studer5, Alfredo Martinez-Garcia5, Tao Li4, Tianyu Chen4 and Gerald H Haug5, (1)California Institute of Technology, Pasadena, CA, United States, (2)Princeton University, Princeton, NJ, United States, (3)Pomona College, Claremont, CA, United States, (4)University of Bristol, Bristol, United Kingdom, (5)Max Planck Institute for Chemistry, Mainz, Germany