Air sea CO2 exchange in the coastal ocean near Barrow Alaska
Abstract
The air sea CO2 exchange rate of a coastal sea in Barrow Alaska was evaluated with the eddy covariance technique and pCO2 measurements during summer 2008. The study area included the Chukchi Sea, the Beaufort Sea, and Elson Lagoon. The eddy covariance measurements were performed from June to August from a beach adjacent to the Beaufort Sea. A large draw down of CO2 was observed during the absence of fast ice. A shore based pCO2 measurement was performed from a beach adjacent to the Chukchi Sea. Dissolved oxygen, salinity and water temperature were measured toghether with pCO2. Chlorophyll and pH were measured periodically. Very low pThe air sea CO2 exchange rate of a coastal sea in Barrow Alaska was evaluated with the eddy covariance technique and pCO2 measurements during summer 2008. THe study area included the Chukchi Sea, the Beaufort Sea, and Elson Lagoon. The eddy covariance measurements were performed from June to August from a beach adjacent to the Beaufort Sea. A large draw down of CO2 was observed during the absence of fast ice. A shore based pCO2 measurement was performed from a beach adjacent to the Chukchi Sea. Dissolved oxygen, salinity and water temperature were measured toghether with pCO2. Chlorophyll and pH were measured periodically. Very low pCO2 (-60 ppm) was observed in early summer with pCO2 values gradually increasing until the end of the field season. On the contrary, dissolved oxygen and chlorophyll concentrations were higher at the beginning of the summer and gradually decreased toward the end of the field campaign. There was no obvious seasonal trend in pH and sea water temperature. After fast ice sheets melted on July 7th, pCO2 measurements were performed on a boat cruise along the coast of Elson Lagoon, the Beaufort Sea, and the Chukchi Sea. A distinct difference in pCO2 was observed between the three seas. THe Chukchi Sea had lower pCO2 than Elson Lagoon and the Beaufort Sea except in late August. There was no consistent relationship between pCO2, sea water temperature, and salinity. However, the data from the boat cruise showed that spatial changes in pCO2 occured together with changes in salinity and sea water temperature. (-60 ppm) was observed in early summer with pCO2 values gradually increasing until the end of the field season. On the contrary, dissolved oxygen and chlorophyll concentrations were higher at the beginning of the summer and gradually decreased toward the end of the field campaign. There was no obvious seasonal trend in pH and sea water temperature. After fast ice sheets melted on July 7th, pCO2 measurements were performed on a boat cruise along the coast of Elson Lagoon, the Beaufort Sea, and the Chukchi Sea. A distinct difference in pCO2 was observed between the three seas. THe Chukchi Sea had lower pCO2 than Elson Lagoon and the Beaufort Sea except in late August. There was no consistent relationship between pCO2, sea water temperature, and salinity. However, the data from the boat cruise showed that spatial changes in pCO2 occured together with changes in salinity and sea water temperature.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2008
- Bibcode:
- 2008AGUFMOS53C1340I
- Keywords:
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- 4806 Carbon cycling (0428)