Year - year
Jd   - Julian (serial) day
Time – Time (HH.hh where hh is decimal fraction of hour  – i.e. 9.10 is 09:06)  
Dyear – decimal year         
Lat – latitude (N +ve)     
Lon – longitude (E +ve)     
nw – number of WQM measurements (temperature, salinity, oxygen, fluorescence, turbidity) taken to calculate average / standard deviation   
nc – number of CDOM measurements taken to calculate average / standard deviation
nn – number of nitrate measurements taken to calculate average / standard deviation  
nm – number of meteorological measurements taken to calculate average / standard deviation  
np – number of hyperspectral irradiance profile measurements taken to calculate average / standard deviation     
SST – Sea-surface Temperature (degC)   
SST_sd – standard deviation of SST (degC)
Sal – Salinity (PSU)   
Sal_sd – standard deviation of salinity (PSU)
Oxy  - Oxygen (uM)
Oxy_sd  - standard deviation of oxygen (uM)
Chl  - chlorophyll (mg/m3)
Chl_sd  - standard deviation of chlorophyll (mg/m3)
SPM   - Turbidity (NTU)
SPM_sd    - standard deviation of turbidity (NTU)
CDM – CDOM (QSU – Quinine Sulphate Units)  
CDM_sd  - standard deviation of CDOM (QSU)
Nit  - nitrate (uM)
Nit_sd – standard deviation of nitrate (uM)
Prs – atmospheric pressure (mb)
Prs_sd – standard deviation of atmospheric pressure
Ta – air temperature (degC)      
Ta_sd  - standard deviation of air temperature
Hum – humidity (%)    
Hum_sd  - standard deviation of humidity (%)
U – zonal wind speed (m/s)      
U_sd – standard deviation of zonal windspeed (m/s)   
V – meridional wind speed (m/s)     
V_sd  - standard deviation of meridional wind speed (m/s)
PAR – PAR (W/m2)   
UV      UV (W/m2)   
pH1 – pH (detector 1)    
pH2 – pH (detector 2)