Variables for DBLK ( Polarstern  WOCE ) experiments :

     date = year-month-day
     hour = decimal hour
     lat = latitude North ( - = South )
     lon = longitude East ( - = West )
     ws = wind speed ( ocean relative  at 37 m )
     seaT = sea near-surface temperature ( bow mounted thermosalinograph )
     airT = air temperature ( 27 m )
     qa = specific humidity ( 27 m )
     wdir = wind direction from North ( 37 m )
     pres = atmospheric pressure 
     dewT = dewpoint temperature ( 27 m )
     rhum = relative humidity ( 27 m )
     rain = precipitation rate
     zcl = cloud base height
     rad = atmospheric radiation