  Dissolved gaseous mercury from the ship's underway system 
  US GEOTRACES Arctic (GN01) HLY1502 
  PI: Robert Mason (UConn) 
  Version history: 
   2021-02-19 (v2) - removed Hg_0_G_CONC_LOWVOL & Hg_0_Flux columns 
   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: 
   na = Geotraces number or Event # was not assigned to this sample 
   nd = parameter not measured or cannot be calculated because of missing data 
