Journal ArticleDOI
Biogenic particle fluxes in the equatorial Pacific: Evidence for both high and low productivity during the 1982‐1983 El Niño
Jack Dymond,Robert W. Collier +1 more
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TLDR
Sediment traps deployed at two sites in the equatorial Pacific during and following the 1982-1983 El Nino southern oscillation demonstrate the biological effects of this event as mentioned in this paper.Abstract:
Sediment traps deployed at two sites in the equatorial Pacific during and following the 1982-1983 El Nino southern oscillation (ENSO) demonstrate the biological effects of this event. Biogenic particle fluxes for a site 1° north of the equator were at least a factor of 2 lower during a 3 month period of intense ENSO influence compared to fluxes recorded at any other time during a 28-month period beginning in December 1982. These low particle fluxes reflect the expected decrease in primary production in response to the ENSO event. Surprisingly, the biogenic particle fluxes measured at the second site, 11°N, were anomalously high during this same ENSO-affected period. The apparent increase in productivity north of the equator seems to be a consequence of enhanced flow of the North Equatorial Countercurrent (NECC) and the associated doming of the shallow thermocline. The observed temporal variability in magnitude of the biogenic particle flux was accompanied by compositional changes in the biogenic components. The period of high carbon flux at the 11°N site was a time of exceptional opal flux, while the particle flux during the period of low carbon flux observed at 1°N during the ENSO was depleted in opal. These patterns appear to reflect the dominance of diatom productivity relative to coccolithophorid productivity during conditions of greater nutrient availability.read more
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Barium in Deep-Sea Sediment: A Geochemical Proxy for Paleoproductivity
TL;DR: In this paper, the authors used sediment traps to define the particulate fluxes of barium and organic carbon and investigate the use of Barium as a proxy for ocean fertility.
Journal ArticleDOI
Production and accumulation of calcium carbonate in the ocean: Budget of a nonsteady state
TL;DR: In this article, it was shown that the oceans are not presently in a steady state, suggesting that outputs have been overestimated or inputs underestimated, that one or more other inputs have not been identified, and/or that one of the missing calcium sources might be groundwater, although its presentday input is probably much smaller than that of rivers.
Journal ArticleDOI
Association of sinking organic matter with various types of mineral ballast in the deep sea: Implications for the rain ratio
TL;DR: In this paper, the authors show that most of the organic carbon rain in the deep sea is carried by calcium carbonate, because it is denser than opal and more abundant than terrigenous material.
Journal ArticleDOI
A review of the Si cycle in the modern ocean: recent progress and missing gaps in the application of biogenic opal as a paleoproductivity proxy
Olivier Ragueneau,Paul Tréguer,Aude Leynaert,Robert F. Anderson,Mark A. Brzezinski,David J. DeMaster,Richard C. Dugdale,Jack Dymond,Gerhard Fischer,Roger Francois,Christoph Heinze,Ernst Maier-Reimer,Véronique Martin-Jézéquel,David M. Nelson,Bernard Quéguiner +14 more
TL;DR: In this article, a review of the Si cycle in the modern ocean starts with the mechanisms that control the uptake of silicic acid (Si(OH)4) by diatoms and the subsequent silicification processes, the regulatory mechanisms of which are uncoupled.
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Particulate organic carbon fluxes to the ocean interior and factors controlling the biological pump: A synthesis of global sediment trap programs since 1983
TL;DR: In this article, the authors investigated the geographic contrasts of POC export at m/b and the supply rate of ∑CO2 to the world mesopelagic water column.
References
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Journal ArticleDOI
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Journal Article
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Journal ArticleDOI
Biological Consequences of El Niño
TL;DR: Evidence from 1982 and 1983 suggests effects on higher organisms such as fish, seabirds, and marine mammals, but several more years of observation are required to accurately determine the magnitude of the consequences on these higher trophic levels.