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. The understanding of the seasonal variability of carbon cycling on theScotian Shelf in the NW Atlantic Ocean has improved in recent years;however, very little information is available regarding itsshort-term variability. In order to shed light on this aspect ofcarbon cycling on the Scotian Shelf we investigate the effects ofHurricane Arthur, which passed the region on 5 July 2014. Thehurricane caused a substantial decline in the surface water partialpressure of CO2 ( p CO2 ), even though the ScotianShelf possesses CO2 -rich deep waters. High-temporal-resolution data of mooredautonomous instruments demonstrate thatthere is a distinct layer of relatively cold water with lowdissolved inorganic carbon (DIC) slightly above the thermocline,presumably due to a sustained population of phytoplankton. Strongstorm-related wind mixing caused this cold intermediate layer withhigh phytoplankton biomass to be entrained into the surface mixedlayer. At the surface, phytoplankton begin to grow more rapidly dueto increased light. The combination of growth and the mixing of low DICwater led to a short-term reduction in the partial pressure of CO2 until wind speeds relaxed and allowed for therestratification of the upper water column. These hurricane-relatedprocesses caused a (net) CO2 uptake by the Scotian Shelfregion that is comparable to the spring bloom, thus exerting a majorimpact on the annual CO2 flux budget.

biogeosciences

Hurricane Arthur and its effect on the short-term variability of &amp;lt;i&amp;gt;p&amp;lt;/i&amp;gt;CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; on the Scotian Shelf, NW Atlantic