Please cite this data set as:

Sabine, C., R. Feely, R. Wanninkhof, A. Dickson, F. MIllero, D. Hansell, and J. Swift. 2012. 
Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Nathaniel B. Palmer Cruise 
in the Southern Ocean on CLIVAR Repeat Hydrography Section S04P (Feb. 19 - Apr. 23, 2011).
http://cdiac.ornl.gov/ftp/oceans/CLIVAR/S04P_2011/. Carbon Dioxide Information Analysis Center, 
Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee. 
doi: 10.3334/CDIAC/OTG.CLIVAR_S04P_2011
