trace_Fe_Al

 PI:              Christopher Measures
 of:              University of Hawaii
 dataset:         Dissolved iron and aluminum concentrations
                            from CTD casts
 project/cruise:  Arabian Sea/TTN-049 - Process Cruise 4   
 ship:            Thomas Thompson
  
 PI Notes and Methodology 
 
 Parameter      Description                                   Units

 event          event number from event log 
 sta            station number from event log 
 sta_std        Arabian Sea standard station identifier
 cast           cast number from event log 
 bot            CTD rosette bottle number
 press          sample depth reported as pressure             decibars
 AlFe_filt_sz   non-zero indicates filter size                microns
 Fe_unfilt      iron concentration, unfiltered                nanomoles/liter
 Al_unfilt      aluminum concentration, unfiltered            nanomoles/liter
 Fe_diss_lt0d2  dissolved iron conc. <0.2 microns             nanomoles/liter
 Al_diss_lt0d2  dissolved aluminum conc. <0.2 microns         nanomoles/liter