Joe Salisbury, Mark Green, Doug Vandemark, Chris Hunt, Dwight Gledhill, Wade McGillis, Chris Sabine

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Influence of land - ocean exchange on carbonate
mineral saturation state

• Joe Salisbury, Mark Green, Doug Vandemark, Chris
  Hunt, Dwight Gledhill, Wade McGillis, Chris Sabine

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Outline

• Comments on variability of ? in coastal regions
  and potential errors in its estimation.
• Preliminary results Understanding ?
  variability in the Amazon Plume with the help of
  satellite data

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Terrestrial influence on ? in coastal regions
via endmember mixing of alkalinity, Ca,
DIC affects in-plume DIC dynamics via subsidies
of freshwater, OC, nutrients, buoyancy
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Background Carbonate mineral saturation state
(?)

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Background Total alkalinity (AT)
TA HCO3- 2CO32- B(OH)4- OH-
other NCA
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Non-carbonate fraction of riverine total
alkalinity (New England and the Canadian
Maritimes) C. Hunt, J. Salisbury, D. Vandemark
(in revision)
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Median USGS Stream data since 2000
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Suggested variability in the land endmember
Median USGS Stream data since 2000
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Median USGS Stream data since 2000
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Median USGS Stream data since 2000
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Main Points --Riverine constituents that affect
W in coastal waters are likely to have
considerable spatial variability. --Caution
advised when using TA as a carbonate parameter
for the estimation of W near the coast.
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Part 2. New work on W dynamics in the Amazon
Plume Satellite-aided tracking of fCO2, TA and
Ca
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Hot new topic Salinity from space !!!
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Omega_ar variability in the Amazon Plume from
mixing of TA, Ca and TCO2
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Tracking the biological perturbation of CO2 with
ocean color satellite data
Modified from Zhai, et al., 2008
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Mixing (TA, Ca, pCO2)
Mixing with modeled net DIC uptake
Omega_ar variability from mixing (left) and
combine mixing and biology (right)
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Some conclusions

• 1. The use of TA as a carbonate parameter may
  cause overestimates in omega in coastal regions
• 2. Productive coastal ecosystems are subjected to
  variability from net community production and
  land. We rarely account for biological processes
• 3. Satellites may provide crucial datasets for
  unraveling these issues

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Acknowledgments
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Global discharge and eutrophication patterns are
changing rapidly Most discharge is
acidic relative to the receiving ocean Most
aquaculture and shellfish harvest within 3km
coast and most fisheries on continental
shelves Arctic ecosystems may be at a threshold
(cold and high discharge) Global annual
discharge can cover continental shelves gt1meter
deep
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Background Calcite mineral saturation state (?)

? is a measure of the product of the
concentrations of CO32- and Ca2 ions relative to
the amount of aragonite that can be dissolved at
a given temperature, salinity and pressure.
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