Sigman, D. M., Jaccard, S. L., Haug, G. H., & 5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum (2004). Polar ocean stratification in a cold climate. Nature, 428, 59-63. doi:10.1038/nature02357.