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)