Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific
- Adjou, Mohamed
- Tréguer, Paul
- Dumousseaud, Cynthia
- Corvaisier, Rudolph
- Brzezinski, Mark A.
- Nelson, Dave
DOIAbstract
International audienceThe distributions of biogenic and lithogenic silica concentrations and net silica production rates in the upper 120 m of the Eastern Equatorial Pacific (EEP) were examined in December 2004, on two transects situated at 110°W (4°N to 3°S) and along the equator (110°W to 140°W). Lithogenic silica (lSiO2) was generally <10 nmol Si l−1 with maximum concentrations reaching 25 nmol l−1 in surface waters. These low concentrations confirm low atmospheric inputs of particulate Si, consistent with reported low inputs of wind-borne material in the EEP. In spite of active upwelling of silicic acid-rich waters the biogenic silica (bSiO2) concentrations were generally low, falling between 100 and 180 nmol Si l−1 in the upper 50 m an...
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