Concentrations and ratios of particulate organic carbon, nitrogen, and phosphorus in the global ocean 
  PIs: Martiny (UC-Irvine), Lomas (Bigelow) 
  
  version 2 date: 2020-12-21 [dates corrected; all no data values changed to 'nd'] 
  version 1 date: 2014-06-09 
     NOTE: large dataset; slow to load