[Directory] [Data...]

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; 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 method mg Chl m-3 chl_a_int_depth depth to which chl_a is integrated meters chl_a_int integrated from 0 meters to the depth of the deepest sample bottle (chl_a_int_depth) mg Chl m-2 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_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 in Case 1 waters based on a profile of extracted chlorophyll 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_0.1 depth of 0.1% light level based on Morel optical model meters pp24_int_0.1 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%) with the 0.1% light being assigned a value of zero. mmol C m-3 d-1 pp24_opt optimum primary production for profile, carbon assimilation (24hours) pb24_opt optimum carbon assimilation per unit chl_a for profile mmol C mg Chl-1 d-1 (24 hours)