Aqueous carbon monoxide cycling in a fjord-like estuary
Document Type
Article
Date of Original Version
5-1-2014
Abstract
Dissolved carbon monoxide, [CO], was measured in oxic surface waters and in the anoxic layer of the Pettaquamscutt River, Rhode Island, from March to August 2008. Samples were collected at near-shore locations to examine spatial and seasonal changes at solar noon. Each month, a set of diel samples was collected at the surface stations to evaluate photoproduction and biological processing. In July and August, anoxic samples from depths >6 m were collected to examine the presence of an active anaerobic CO metabolism. The surface [CO] decreased from 65 to 5 nmol kg−1from spring to summer, which was attributed to a decline in dissolved organic matter. Diel [CO] showed a strong mid-afternoon maximum with a late evening and early morning minimum. Inferred first-order loss rates, attributed to biological processing, ranged from 0.1-0.6 h−1without a clear seasonal pattern. [CO] saturation ratios were typically >200 at mid-day, >7 in morning/ late evening, and never below 1, implying the river is always a net source of CO to the atmosphere. [CO] in the anoxic layer averaged 2 nmol kg−1.
Publication Title, e.g., Journal
Estuaries and Coasts
Volume
37
Issue
3
Citation/Publisher Attribution
Schmidt, Courtney E., and Brian G. Heikes. "Aqueous carbon monoxide cycling in a fjord-like estuary." Estuaries and Coasts 37, 3 (2014). doi: 10.1007/s12237-013-9722-0.