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primprod_ondeck

 PI:              Richard Barber,  Duke University     
                         John Marra, Lamont Doherty Earth Observatory
                         Walker Smith, Virginia Institute of Marine Science  
 dataset:         Primary Production, incubated on deck, 24 hours
 technician:      Michael Hiscock, Duke University
 project/cruise:  AESOPS/RR_KIWI09; Process Cruise 2
 ship:            R.V. Roger Revelle
 
 Methods reported in:
   - Please see Chapter 19 of the JGOFS protocols (1994) "Primary Production by 14C"
   - Barber, Richard T. 1993. In Situ Primary Production Protocols.
       U.S. Joint Global Ocean Flux Study - 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 fluorometric mg Chl m-3 method chl_a_int_depth depth to which chl_a is integrated meters chl_a_int integrated from 0 meters to the depth of mg Chl m-2 the deepest sample bottle of the euphotic profile (chl_a_int_depth) light incident light the incubator receives percent depth_inc effective depth of the samples incubated meters on deck (based on Morel optical model) Note: Analysis of on deck estimates of primary productivity in the equatorial Pacific made from a variety of ships in the 1980's showed that the process of determining kpar and assigning a depth to each percent light level was the largest source of variation in estimating primary productivity (Barber and Chavez, 1991). 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 was employed (Morel, 1988; Barber et. al., 1997). The model estimates the profile of light extinction based on a profile of extracted chlorophyll concentrations. The Morel light profile is then used to assign effective incubation depths used for integration of water column productivity. pp24 primary production, carbon assimilation mmol C m-3 d-1 (24 hours) Note: On deck primary productivity incubations were ground truthed with in situ incubations (Barber et. al., 1997). pb24 carbon assimilation per unit chl_a (24 hours) mmol C mg Chl-1 d-1 depth_1 depth of 1% light level based on Morel meters optical model pp24_int_1 primary production, carbon assimilation mmol C m-2 d-1 (24 hours) 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 extrapolated from the on deck productivity profile and calibrated with in situ ground truthing. depth_0.1 depth of 0.1% light level based on Morel meters optical model pp24_int_0.1 primary production, carbon assimilation mmol C m-2 d-1 (24 hours) 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 extrapolated from the on deck productivity profile and calibrated with in situ ground truthing. pp24_opt optimum primary production for profile, mmol C m-3 d-1 carbon assimilation (24 hours) pb24_opt optimum carbon assimilation per unit mmol C mg Chl-1 d-1 chl_a for profile (24 hours)