Mercury in melt ponds 
  US GEOTRACES Arctic (GN01) HLY1502 
  PI: Robert Mason (UConn) 
  Version history: 
   2021-01-25 (v1) - renamed fields with DOoR barcodes 
   2019-11-01 (v0.5) - revised dataset received Oct 2019 
   2019-10-14 (v0) - version received July 2019; preliminary/for PI review 
  Notes: 
   * = data from Alison Agather						 
   nd = date not recorded