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| Lefèvre, Nathalie; Tyaquiçã, Pedro; Veleda, Doris; Perruche, Coralie; Van Gennip, Simon Jan. |
| The surface fugacity of CO2 (fCO2) has been measured hourly at a mooring at 8°N, 38°W, using a spectrophotometric CO2 sensor, from June to October 2013. In September 2013, the fCO2 and the sea surface salinity (SSS) decrease significantly. The high precipitation due to the presence of the Intertropical Convergence Zone (ITCZ) and the propagation of low salinity waters from the Amazon River plume explain the decrease of SSS. Indeed, in fall, the retroflection of the North Brazil Current (NBC) feeds the North Equatorial Counter Current (NECC) and transports Amazon waters to the eastern part of the tropical Atlantic. Simulations from a three dimensional physical and biogeochemical model and observations at the mooring show that the Amazon plume reached the... |
| Tipo: Text |
Palavras-chave: Fugacity of CO2; Air-sea flux of CO2; Western tropical Atlantic; Amazon plume. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75322/75848.pdf |
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| Lefevre, Nathalie; Veleda, Doris; Araujo, Moacyr; Caniaux, Guy. |
| Hourly fCO(2) is recorded at a time series at the PIRATA buoy located at 6 degrees S 10 degrees W in the eastern tropical Atlantic since June 2006. This site is located south and west of the seasonal Atlantic cold tongue and is affected by its propagation from June to September. Using an alkalinity - salinity relationship determined for the eastern tropical Atlantic and the observed fCO(2), pH and the inorganic carbon concentration are calculated. The time series is investigated to explore the intraseasonal, seasonal and interannual timescales for these parameters, and to detect any long-term trends. At intraseasonal timescales, fCO(2) and pH are strongly correlated. On seasonal timescales, the correlation still holds between fCO(2) and pH and their... |
| Tipo: Text |
Palavras-chave: Fugacity of CO2; Ocean acidification; Time series; Eastern tropical Atlantic. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00623/73560/73207.pdf |
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