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WONG, C. S.; CHAN, Y.-H.; PAGE, J. S.; SMITH, G. E.; BELLEGAY, R. D. (2011)
Publisher: Tellus B
Journal: Tellus B
Languages: English
Types: Article
Subjects:
The seasonal variabilities of the CO2 system and dissolved nutrients (nitrate, phosphate, and silicate) in surface seawater of the central tropical Pacific Ocean before and during the 1986/1987 El Niño/Southern Oscillation (ENSO) warm event were observed as part of a ship-of-opportunity program. Beginning in late 1986 and continuing through 1987, there was a gradual increase in sea surface temperature (SST) and slight decrease of surface seawater salinity around the central equatorial region. These changes were accompanied by decreasing levels of dissolved nutrients, ocean-surface pCO2, dissolved inorganic carbon (Σ CO2) and net CO2 evasion. In September 1987, equatorial SST was warmest while CO2 evasion, pCO2, Σ CO2, and the dissolved nutrients reached their lowest levels. In September 1987, owing to the weakened equatorial upwelling, the supply of Σ CO2 from deeper waters was reduced by about 97–194 mM m-2 d-1, while the low replenishment of nitrate represented a loss of about 17–34 mM C m-2 d-1 in new production. The evasion of CO2 from the central equatorial Pacific between 5°S and 5°N [10°S and 10°N] was estimated to be about 1.2 M CO2 m-2 yr-1[0.9 M CO2 m-2 yr-1] prior to the 1987 El Niño, but only 0.2 M CO2 m-2 yr-1[0.2 M CO2 m-2 yr-1] during the El Niño.DOI: 10.1034/j.1600-0889.1993.00006.x
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