Articles | Volume 14, issue 13
https://doi.org/10.5194/bg-14-3221-2017
https://doi.org/10.5194/bg-14-3221-2017
Research article
 | 
06 Jul 2017
Research article |  | 06 Jul 2017

Spatial variability in surface-water pCO2 and gas exchange in the world's largest semi-enclosed estuarine system: St. Lawrence Estuary (Canada)

Ashley Dinauer and Alfonso Mucci

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Short summary
Because of its large physical dimensions and unimpeded connection to the Atlantic Ocean, the St. Lawrence Gulf and Estuary encompass both estuarine and marine environments. The underlying physical and biogeochemical processes are reflected in the spatial pattern of surface-water pCO2 (139–765 µatm). The shallow partially mixed upper estuary was a CO2 source due to microbial respiration, whereas the deep stratified lower estuary was generally a CO2 sink due to phytoplankton photosynthesis.
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