Impact of a coccolithophorid bloom on the CO2 system in surface waters of the eastern Bering Sea shelf

Details Impact of a coccolithophorid bloom on the CO2 system in surface waters of the eastern Bering Sea shelf Impact of a coccolithophorid bloom on the CO2 system in surface waters of the eastern Bering Sea shelf

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..42m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 11, pp. 42-1, CiteID 1547, DOI 10.1029/2001GL013906

Mathematics

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7

Oceanography: Biological And Chemical: Carbon Cycling, Oceanography: General: Continental Shelf Processes, Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Information Related To Geographic Region: Arctic Region

Scientific paper

A bloom of the coccolithophorid, E. huxleyi, occurred on the eastern Bering Sea shelf during September-October 2000. We examined the impact of this bloom on the CO2 system in the surface water. Drawdowns of total alkalinity (TAlk) from the values predicted by the TAlk-salinity conservative mixing relationship reached a maximum of 82.0 μmol kg-1, but was confined to latitudes 57.0°N-61.0°N. Surface water partial pressures of CO2 (pCO2) in excess of 400 μatm, depletion of nitrate + nitrite and low concentrations of silicate were also found, together with the TAlk drawdowns. The relationship between salinity-normalized TAlk and total CO2 suggests that the ratio of calcification to photosynthesis during the bloom was approximately 1.0, implying that any CO2 produced from calcification was balanced by photosynthesis. We discuss the possible cause of the observed high surface water pCO2 in the TAlk-drawdown (bloom) area.

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