areal_sum

 PI:              James J. McCarthy
 dataset:         Areal Summary, daily N-15 uptake rates and f-ratios
 project/cruise:  Arabian Sea/TTN-053 - Process Cruise 6   
 ship:            Thomas Thompson
 
 
 Data and Documentation Revised 09/10/1999

 Note:  These data have been revised with new integrations to the
       mixed layer depth or the 1% light depth, which ever is shallower.
 
 070924. CLC. added event number, lat, lon (from event log) to support GIS interface.

 Methodology:  McCarthy, J.J., C. Garside, and J.L. Nevins. (1999) Nitrogen
              Dynamics during the Arabian Sea Northeast Monsoon. Deep-Sea
              Research II 46 (1999) 1623-1664.
 
 DMO note: unable to determine more accurate position from event log;
           samples were drawn from the CTD rosette sampler, but multiple CTD 
           casts were done at each station location
 
 
 Parameter      Description                                Units

 sta          station number, from event log
 sta_std      Arabian Sea standard station identifier
 event        a unique number assigned to each sampling   
                operation consisting of month MM, day DD
	        hour HH and minute mm
 lat          start latitude of cast (negative = South)   decimal degrees
 lon          start longitude of cast (negative = West)   decimal degrees
 lat_n        nominal latitude of station                 decimal degrees
                (minus = south)
 lon_n        nominal longitude of station                decimal degrees
 		(minus = west)
 pNO2         N-15 uptake from nitrite labeled            mMol N /m^2/d
                  substrate		  
 pNO3         N-15 uptake from nitrate labeled            mMol N /m^2/d
                  substrate		  
 pNH4         N-15 uptake from ammomium labeled           mMol N /m^2/d
                  substrate		  		  		  
 f_ratio      f ratio define as follows: 
                  pNO3/(pNO2+pNO3+NH4)