In:
Biogeosciences, Copernicus GmbH, Vol. 16, No. 2 ( 2019-02-01), p. 605-616
Abstract:
Abstract. Assessing changes in the marine carbon cycle arising from anthropogenic
CO2 emissions requires a detailed understanding of the carbonate
system's natural variability. Coastal ecosystems vary over short spatial and
temporal scales, so their dynamics are not well described by long-term and
broad regional averages. A year-long time series of pCO2,
temperature, salinity, and currents is used to quantify the high-frequency
variability of the carbonate system at the mouth of the Bay of Fundy, Nova
Scotia. The seasonal cycle of pCO2 is modulated by a diel
cycle that is larger in summer than in winter and a tidal contribution that
is primarily M2, with amplitude roughly half that of the diel cycle
throughout the year. The interaction between tidal currents and carbonate
system variables leads to lateral transport by tidal pumping, which moves
alkalinity and dissolved inorganic carbon (DIC) out of the bay, opposite to the mean flow in the region,
and constitutes a new feature of how this strongly tidal region connects to
the larger Gulf of Maine and northwest Atlantic carbon system. These results
suggest that tidal pumping could substantially modulate the coastal ocean's
response to global ocean acidification in any region with large tides and
spatial variation in biological activity, requiring that high-frequency
variability be accounted for in assessments of carbon budgets of coastal
regions.
Type of Medium:
Online Resource
ISSN:
1726-4189
DOI:
10.5194/bg-16-605-2019
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2019
detail.hit.zdb_id:
2158181-2
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