Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific
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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, David M.
In: Deep Sea Research - Part II - Topical Studies in Oceanography, Vol. 58, No. 3-4, 2011, p. 449-461.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific
AU - Adjou, Mohamed
AU - Tréguer, Paul
AU - Dumousseaud, Cynthia
AU - Corvaisier, Rudolph
AU - Brzezinski, Mark A.
AU - Nelson, David M.
PY - 2011
Y1 - 2011
N2 - The 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 and decreasing to less than 50 nmol Si l-1 below ~90 m. Estimates of net bSiO2 production rates revealed that the rate of production exceeded that of dissolution in the upper euphotic layer (0-40 m) along 110°W with net production extending somewhat deeper (60-100 m) to the west along the equator. Net production rates in the surface layer were low, ranging between 5 and 40 nmol Si l-1 d-1, consistent with previous observations that diatoms are small contributors to autotrophic biomass in the EEP. Net silica dissolution predominated in the lower euphotic layer (40-120 m), indicating active Si recycling which diminished the strength of the silica pump in this region.
AB - The 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 and decreasing to less than 50 nmol Si l-1 below ~90 m. Estimates of net bSiO2 production rates revealed that the rate of production exceeded that of dissolution in the upper euphotic layer (0-40 m) along 110°W with net production extending somewhat deeper (60-100 m) to the west along the equator. Net production rates in the surface layer were low, ranging between 5 and 40 nmol Si l-1 d-1, consistent with previous observations that diatoms are small contributors to autotrophic biomass in the EEP. Net silica dissolution predominated in the lower euphotic layer (40-120 m), indicating active Si recycling which diminished the strength of the silica pump in this region.
U2 - 10.1016/j.dsr2.2010.08.002
DO - 10.1016/j.dsr2.2010.08.002
M3 - Journal article
VL - 58
SP - 449
EP - 461
JO - Deep-Sea Research Part II: Topical Studies in Oceanography
JF - Deep-Sea Research Part II: Topical Studies in Oceanography
SN - 0967-0645
IS - 3-4
ER -
ID: 40323081