light, nutrients (including iron) and primary...
TRANSCRIPT
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IMAGE: NASA Goddard Space Flight Center
Light, Nutrients(including iron)
and Primary Productivity
John J. Cullen
Department of Oceanography, Dalhousie UniversityHalifax, Nova Scotia, Canada B3H 4R2
2013 C-MORE Summer Course “Microbial Oceanography:
Genomes to Biomes”
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Productivity in the ocean depends on light and nutrients
The major nutrientsare N and P
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John Cullen: Agouron Institute 2013
Physical processes have a major influence
Sverdrup’s (1955) map of productivity based on vertical
convection, upwelling and turbulent diffusion
Global productivity estimated from remote sensing
(Falkowski et al. 1998).
As presented by John McGowan (Oceanography Mag., 2004)Friday, 31 May, 13
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Global productivity from SeaWiFS ocean color (NASA/GSFC)
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Southern Ocean
Subarctic Pacific
Equatorial Pacific
Incomplete utilization of nutrients:HNLC = High Nutrient Low Chlorophyll Waters
Concentration of nitrate at the surface (µmol kg-1)
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Iron is an important nutrient, required in trace amounts
Required for:
• synthesis of chlorophyll• utilization of nitrate• nitrogen fixation
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0
50,000
100,000
150,000
200,000
250,000
300,000
Phosphorus Nitrogen Carbon
A little bit of iron cansupport a lot of plant material
Cel
lula
r Con
cent
ratio
nR
elat
ive
to Ir
on (a
tom
s)
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But…
Iron is not very soluble in seawater, so it waslong thought to be a potential limiting nutrient
However…
Very difficult to measure without contamination
So…
Little progress was made until the 80’s
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Bottle effects?
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Martin’s “Iron Hypothesis” had support in the record of global climate change
Text
From Strong et al., Oceanography, 2009
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CO2 + Nutrients → Organic Mattersinking
particlesup
wel
ling
and
mix
ing
Bottom
�
106 CO 2 + 122 H2O +16 HNO3 + H3PO4 ⎯ → ⎯ [(CH2O)106 +(NH3 )16 +H3PO4 ] +138 O2
Primary production
Decomposition
CO2 + Nutrients ← Organic Matter
106 CO2 +122 H2O+16 HNO3 + H3PO4 ←⎯⎯ [(CH2O)106 +(NH3)16 +H3PO4 ]+138 O2
CO2
Organic C
Ocean Cycle of Life and Death
– At the Balance Point –
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Biological Oceanography (8): John Cullen
CO2 + Nutrients → Organic Mattersinking
particlesup
wel
ling
and
mix
ing
Bottom
Primary production
Decomposition
CO2 + Nutrients ← Organic Matter
CO2
Organic C
Biological Reason for Elevated CO2 in the Deep Sea:Decomposition of Organic Matter
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Cullen C-MORE 2013
16from a slide by Dave Karl
CO2 is elevated in thedeep oceanbecause nutrients aredepleted at the surfaceand regenerated at depth
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Biological Oceanography (8): John Cullen
CO2 + Nutrients → Organic Mattersinking
particlesup
wel
ling
and
mix
ing
Bottom
Primary production
DecompositionCO2 + Nutrients ← Organic Matter
CO2
Organic C
Increased utilization of nutrients in the surface layerwill lead to higherconcentrations of CO2 in the deep ocean
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“give me half a tanker of iron, and I will give you the next ice age”
… John Martin
Over beer, on the Redfield patio, Woods Hole OceanographicInstitution, July 1988
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May 20, 1990
Firstsurge ofpublicity
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February 1991
Scientists tackle the issue head-on
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Biology of Phytoplankton (7) – Cullen and MacIntyre
1991 Consensus Resolution: Synopsis
Research — YES
Geoengineering — NO
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The ocean geoengineering controversy has lived on
Today’s topic is the science.Friday, 31 May, 13
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Focus on microbial ecology
During the symposium In the special issue andother papers published in the early
1990’s
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Limitations of bottle experiments were recognized
Text
Why did controls g
row?
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Morel, F. M. M., J. G. Rueter, and N. M. Price (1991), Oceanography Mag., 4, 56-61.
The “Ecumenical Iron Hypothesis” was developed quickly
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Cullen, J. J. (1995), Status of the iron hypothesis after the open-ocean enrichment experiment, Limnology and Oceanography, 40, 1336-1343.
Many biological oceanographers drew similar conclusions
…I don’t think that the original hypotheses were far off the mark
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Biological Oceanography (4): John Cullen
Cell size matters: bigger cells have lower surface:volume and thus require higher concentrations of nutrients to grow at the same rage as smaller cells
Riebesell U, Wolf-Gladrow DA (2002) Supply and uptake of inorganic nutrients. In: Williams PJL, Thomas DN, Reynolds CS (eds) Phytoplankton Productivity. Carbon Assimilation in Marine and Freshwater Ecosystems. Blackwell, Oxford, p 109-140
See also: Chisholm, S.W., 1992. Phytoplankton size. In P.G. Falkowski, A. Woodhead (Eds.), Primary Productivity and Biogeochemical Cycles in the Sea (pp. 213-238). New York: Plenum.
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Biological Oceanography (4): John Cullen
Cell size matters: smaller cells are grazed by protozoa that can reproduce very rapidly and control prey populations
See also:
Banse K (1992) Grazing, temporal changes of phytoplankton concentrations and the microbial loop in the open sea. In: Falkowski PG, Woodhead AD (eds) Primary Productivity and Biogeochemical Cycles in the Sea, Vol 43. Plenum, New York, p 409- 440
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John Cullen: C-MORE 2011
Not simply temperature, irradiance, nutrients
Cullen et al. 2002, The Sea
LARGER CELLSHIGHER BIOMASS
TRANSIENT & SELF-LIMITINGSELECTION FOR RAPID GROWTH
(DIATOMS)
SMALLER CELLSHIGH TURNOVER
COMPETITION FOR NUTRIENTSRETENTION BY RECYCLING
(MICROBIAL LOOP)
LARGER CELLSHIGHER BIOMASS
SLOWER TURNOVERSELECTIVE PRESSURE
TO SEQUESTER NUTRIENTSAND MINIMIZE LOSSES
(e.g., NOXIOUS/TOXIC BLOOMS)Nutrien
ts —
>
LOW BIOMASSSLOW TURNOVERADAPTATIONS FOREFFICIENT USE OF LIGHT&NUTRIENTS
(HIGH-LATITUDE“HNLC”)
Turbulence —>
Potential for Production and Export —>
Event-Scale Forcing —><— Succession
High Turbulence and Low Nutrients
High Turbulence and H
igh NutrientsLo
w T
urbu
lenc
e an
d Lo
w N
utrie
nts
Low Turbulence and High Nutrients
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John Cullen: C-MORE 2011
http://www.nature.com/scitable/knowledge/library/the-biological-productivity-of-the-ocean-section-70631104
Sustained release from iron limitation could reimpose the low nutrient condition
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Global productivity from SeaWiFS ocean color (NASA/GSFC)
Do the patterns still make sense?
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Biological Oceanography (8): John Cullen
CO2 + Nutrients → Organic Mattersinking
particlesup
wel
ling
and
mix
ing
Bottom
Primary production
DecompositionCO2 + Nutrients ← Organic Matter
CO2
Organic C
Phosphate utilization is the ultimate driver ofbiological carbon storagein the deep sea
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Surface Nitrate Surface Phosphate
ReallyLow
ReallyLow
Not so Low!
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Phosphate is not drawndown in the south Atlantic
because N-fixation is limitedby the supply of iron
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Global productivity from SeaWiFS ocean color (NASA/GSFC)
Do the patterns still make sense?
Friday, 31 May, 13
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