Primary production, new production and vertical flux in the eastern Pacific Ocean

The sinking of participate organic matter in the ocean links food webs beneath the euphotic zone to surface primary production and is an important pathway for the downward transport of many elements1–3. The flux of particulate organic carbon (POC) is also an important parameter in the global carbon cycle and may be related to long-term changes in atmospheric CO2 4,5. In 1980, Suess6 synthesized existing measurements from sediment trap studies into a model to predict the vertical flux of POC from depth (z) and primary production (PP)6. The Suess model has become the standard for evaluating vertical flux data7, for estimating the annual flux of POC in the ocean8 and for parameterizing ocean carbon cycle models4,5. We present here a new model of the vertical flux of POC and particulate organic nitrogen (PON) from a set of contemporaneous measurements of PP and fluxes made during the VERTEX (Vertical Transport and Exchange) programme in the north-east Pacific. The VERTEX model indicates that PP and vertical fluxes of POC and PON, in the oligotrophic ocean are greater than previously suggested. In addition, the vertical flux of PON from the photic zone represents a measure of the PP that is supported by new nitrogen (new production)9,10. In the north-east Pacific, new production ranged from 13 to 25% of primary production and was positively related to total PP.

[1]  Trevor Platt,et al.  Primary productivity in the central North Pacific: comparison of oxygen and carbon fluxes , 1984 .

[2]  B. Peterson,et al.  Particulate organic matter flux and planktonic new production in the deep ocean , 1979, Nature.

[3]  W. J. Jenkins,et al.  Oxygen utilization rates in North Atlantic subtropical gyre and primary production in oligotrophic systems , 1982, Nature.

[4]  Martin V. Angel,et al.  Detrital Organic Fluxes Through Pelagic Ecosystems , 1984 .

[5]  M. Lyle,et al.  Flux comparisons between sediments and sediment traps in the eastern tropical Pacific: Implications for atmospheric C02 variations during the Pleistocene1 , 1985 .

[6]  R. Kerr The Ocean's Deserts Are Blooming. , 1986, Science.

[7]  M. Bender,et al.  Tracers in the Sea , 1984 .

[8]  J. H. Martin,et al.  Bacterial chemolithotrophy in the ocean is associated with sinking particles , 1984, Nature.

[9]  Giacomo R. DiTullio,et al.  Primary productivity and particle fluxes on a transect of the equator at 153°W in the Pacific Ocean , 1984 .

[10]  G. A. Knauer,et al.  Zooplankton fecal pellet fluxes and vertical transport of particulate organic material in the pelagic environment , 1981 .

[11]  D. Sprugel,et al.  Correcting for Bias in Log‐Transformed Allometric Equations , 1983 .

[12]  S. Fowler,et al.  Role of large particles in the transport of elements and organic compounds through the oceanic water column , 1986 .

[13]  S. Fitzwater,et al.  Metal contamination and its effect on primary production measurements1 , 1982 .

[14]  W. J. Jenkins,et al.  Seasonal oxygen cycling and primary production in the Sargasso Sea , 1985 .

[15]  Kenneth W. Bruland,et al.  Fluxes of particulate carbon, nitrogen, and phosphorus in the upper water column of the northeast Pacific , 1979 .

[16]  David M. Karl,et al.  In situ effects of selected preservatives on total carbon, nitrogen and metals collected in sediment traps , 1984 .

[17]  Eric Shulenberger,et al.  The Pacific shallow oxygen maximum, deep chlorophyll maximum, and primary productivity, reconsidered , 1981 .

[18]  T. Platt,et al.  Biogenic fluxes of carbon and oxygen in the ocean , 1985, Nature.

[19]  J. Toggweiler,et al.  A new model for the role of the oceans in determining atmospheric PCO2 , 1984, Nature.

[20]  J. Goering,et al.  UPTAKE OF NEW AND REGENERATED FORMS OF NITROGEN IN PRIMARY PRODUCTIVITY1 , 1967 .

[21]  B. Hargrave Particle sedimentation in the ocean , 1985 .

[22]  Erwin Suess,et al.  Particulate organic carbon flux in the oceans—surface productivity and oxygen utilization , 1980, Nature.