Reference : Carbon dioxide dynamics in rivers and coastal waters of the ABig Island@ of Hawaii, U...
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Carbon dioxide dynamics in rivers and coastal waters of the ABig Island@ of Hawaii, USA, during baseline and heavy rain condition
Paquay, F. S. [ > > ]
Mackenzie, F. T. [ > > ]
Borges, Alberto mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Aquatic Geochemistry
Springer Science & Business Media B.V.
Yes (verified by ORBi)
New York
[en] The distributions of the partial pressure of carbon dioxide (pCO2) and
total alkalinity (TA) were examined for a 6-month period in the Wailuku and
Wailoa rivers and coastal waters of Hilo Bay on the west coast of the Island of
Hawaii, USA. Main results for the largest and turbulent Wailuku River show in the
watershed an oversaturation in CO2 with respect to atmospheric equilibrium and a
CO2 undersaturation in the estuary. In the Wailoa river-estuary system, extremely
high pCO2 values ranging from 1500 to 10500 ppm were measured with significant
shifts in pCO2 from drought to flood period. In the two rivers, water residence time,
groundwater inputs and occasional flood events are the predominant drivers of the
spatial and temporal patterns in the distribution of pCO2. In Hilo Bay, CO2 oversaturation
dominates and the bay was a source of CO2 to the atmosphere during the
study period. TA is conservative along the salinity gradient, indicating calcification
in the bay is not a significant source of CO2 to the atmosphere.

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