首页|Air–sea flux of CO_2 in arctic coastal waters influenced by glacial melt water and sea ice
Air–sea flux of CO_2 in arctic coastal waters influenced by glacial melt water and sea ice
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NSTL
Taylor & Francis
Annual air–sea exchange ofCO_2 inYoung Sound,NEGreenlandwas estimated using pCO_2 surface-water measurements during summer (2006–2009) and during an ice-covered winter 2008. All surface pCO_2 values were below atmospheric levels indicating an uptake of atmospheric CO_2. During sea ice formation, dissolved inorganic carbon (DIC) content is reduced causing sea ice to be under saturated in CO_2. Approximately 1% of the DIC forced out of growing sea ice was released into the atmosphere while the remaining 99% was exported to the underlying water column. Sea ice covered the fjord 9 months a year and thereby efficiently blocked air–sea CO_2 exchange. During sea ice melt, dissolution of C_aCO_3 combined with primary production and strong stratification of the water column acted to lower surface-water pCO_2 levels in the fjord. Also, a large input of glacial melt water containing geochemically reactive carbonate minerals may contribute to the low surface-water pCO_2 levels. The average annual uptake of atmospheric CO_2was estimated at 2.7 mol CO_2m~(-2 )yr~(-1) or 32 gCm~(-2 )yr~(-1) for the study area, which is lower than estimates from the Greenland Sea.Variability in duration of sea ice cover caused significant year-to-year variation in annual gas exchange.
NSTL
Taylor & Francis
