primary_prod

 PI:              Richard Barber,  Duke University     
                  John Marra, Lamont Doherty Earth Observatory
                  Walker Smith, Virginia Institute of Marine Science  
 dataset:         Primary Production, incubated in situ, 24 hours
 technician:      Michael Hiscock, Duke University
 project/cruise:  AESOPS/RR_KIWI09; APFZ Process Cruise 2
 ship:            R/V Roger Revelle
 
 Methodology: 
   - Chapter 19 of the JGOFS protocols (1994) "Primary Production by 14C"
   - Hiscock, M.R., Marra, J., Smith, W.O., Jr., Goericke, R., Measures, 
     C.I., Vink, S., Olson, R.J., Sosik, H.M., Barber, R.T., in press. Primary 
     Productivity and its Regulation in the Pacific Sector of the Southern
     Ocean. Deep Sea Research II.
   - Barber, Richard T. 1993. In Situ Primary Production Protocols.
     U.S. JGOFS Equatorial Pacific Protocols, 1993, section 7.
   - Smith, W. O., Jr., R. T. Barber, M. R. Hiscock and J. Marra (submitted)
     The Seasonal Cycle of Phytoplankton Biomass and Primary Productivity
     in the Ross Sea, Antarctica.   Deep-Sea Research II.
   - Barber, R. T., L. Borden, Z. Johnson, J. Marra, C. Knudsen, and C.C.Trees
     (1997) Ground truthing modeled kpar and on deck primary productivity
     incubations with in situ observations. SPIE 2963, 834-839.
   - Barber, R. T. and F. P. Chavez (1991) Regulation of primary productivity
     rate in the equatorial Pacific Ocean.  Limnol. Oceanogr. 36, 1803-1815.
   - Morel, A. (1988) Optical modelling of the upper ocean in relation to its
     biogenous matter content (Case 1 waters).  
     Journal of Biophysical Research 93, 10749-10768.


 Parameter        Description                                              Units

 event            event number, from event log
 sta              station number, from event log
 cast             cast number, from event log 
 cast_type        TM = trace metal rosette
                  CTD = CTD rosette
 bot              Goflo or Niskin bottle number
 depth_n          nominal depth sampled by Goflo or Niskin                 meters
 chl_a            chlorophyll_a as measured by HPLC method                 mg Chl m-3
                    In cases where we had primary productivity 
                    measurements but no HPLC values, the 
                    fluorometric chlorophyll a values were 
                    corrected to photosynthetically-active HPLC 
                    chlorophyll a values according to a linear 
                    regression analysis of pairs of HPLC and 
                    fluorometric measurements made from the 
                    same water bottles (m=0.401, b=-0.000913, 
                    n=106, r2 = 0.69) (Hiscock et al., in press)
 depth_in_situ    depth where samples were incubated in situ               meters
 pp24             primary production, carbon assimilation (24 hours)       mmol C m-3 d-1 
 pb24             carbon assimilation per unit chl_a (24 hours)            mmol C mg Chl-1 d-1
 depth_light_1    depth of 1% light level based on Morel optical model           meters
                   Note:  To eliminate individual, ship and cruise
                   dependent sources of variability in the estimation
                   of kpar and assignment of light depths, Andre Morel's
                   optical model is employed (Morel, 1988; Barber et.
                   al., 1997).  The model estimates the profile of light
                   extinction based on a profile of extracted 
                   fluorometrically-determined chlorophyll a 
                   concentrations.  The Morel light profile is helpful 
                   in comparing on deck vs. in situ primary production 
                   integrations.
 pp24_int_1       primary production, carbon assimilation (24 hours)       mmol C m-2 d-1
                   integrated from 0 meters to the depth of the 1%
                   light level based on Morel optical model (depth_1%)
                   Note: 1% light level productivity was interpolated
                   or extrapolated from the in situ productivity
                   profile.
 depth_light_0d1  depth of 0.1% light level based on Morel optical model   meters
 pp24_int_0d1     primary production, carbon assimilation (24 hours)       mmol C m-2 d-1
                   integrated from 0 meters to the depth of the 0.1%
                   light level based on Morel optical model (depth_0.1%)
                   Note: 1% and 0.1% light level productivity values 
                   were interpolated or extrapolated from the in situ 
                   productivity profile.
 pp24_opt         optimum primary production for profile, carbon           mmol C m-3 d-1
                   assimilation (24hours)
 pb24_opt         optimum carbon assimilation per unit chl_a for profile   mmol C mg Chl-1 d-1
                   (24 hours)