manganese_part

 PI:             Brent Lewis and George Luther
 of:             University of Delaware            
 dataset:        Particulate Manganese and Aluminum concentrations
 project/cruise: Arabian Sea/TTN-045, Process cruise #2
 ship:           R/V Thomas Thompson

 Methods:  Landing, W.M. and B.L. Lewis.  1991. Collection, processing and
          analysis of marine particulate and colloidal material for transition
          metals.  IN:  Marine Particles: Analysis and Characterization,
          (D.C. Hurd and D.W. Spencer, eds.), Geophysical Monograph 63,
          American Geophysical Union, Washington, D.C., pp. 263-272.

 Notes:

 1.  Particulate Mn and Al concentrations are in nmoles/liter.
 2.  Samples were collected by pressure filtration under nitrogen directly from
     the rosette bottles through 144 mm 0.4 micron Nuclepore filters held in 
     Teflon filter sandwiches.
 3.  "leach" and "refrac" designate "acetic-acid leachable" and "refractory"
     (microwave digestion with HCl/HNO3/HF) fractions, respectively.
 4.  Stations N2-N9 were sampled from the TM rosette.  Stations S2-S13 were
     sampled using University of Washington bottles on the "Monster rosette"
     (See event log).  TM rosette samples were processed on deck. UW bottles
     were taken into lab and processed in a positive-pressure 2x4 lumber and
     sheet plastic clean enclosure equipped with a HEPA-filtered clean air
     supply.

 Parameters            Descriptions                             Units

 event                 event number, from event log
 sta_std               Arabian Sea standard station
                        identifier
 cast_type             TM = trace metal rosette
                       MR = monster rosette
 sta                   station number, from event log
 cast                  cast number, from event log
 bot                   rosette bottle number
 depth_n               nominal depth                            meters
 Mn_part_gt0d4_leach   particulate Mn conc. >0.4 microns        nanomoles/liter
                       in the leachable fraction
 Mn_part_gt0d4_refrac  particulate Mn conc. >0.4 microns        nanomoles/liter
                       in the refractory fraction
 Mn_part_gt0d4_sum     particulate Mn conc. >0.4 microns        nanomoles/liter
                       sum of leach and refractory fractions
 Al_part_gt0d4_leach   particulate Al conc. >0.4 microns        nanomoles/liter
                       in the leachable fraction
 Al_part_gt0d4_refrac  particulate Al conc. >0.4 microns        nanomoles/liter
                       in the refractory fraction
 Al_part_gt0d4_sum     particulate Al conc. >0.4 microns        nanomoles/liter
                       sum of leach and refractory fractions