Modeled biogeochemical responses to mesoscale eddies in the South China Sea
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In this article, a coupled three-dimensional physical-biogeochemical model was used to evaluate the impact of cyclonic eddies in the South China Sea (SCS).Abstract:
[1] Mesoscale eddies are observed each year in the South China Sea (SCS); however, their contributions to the biogeochemical cycles have never been systematically quantified. Here, we use a coupled three-dimensional physical-biogeochemical model to evaluate the eddy impact. We first track the modeled mesoscale eddies in the SCS and then analyze the biogeochemical responses to these eddies individually. Compared with the SCS basin mean, modeled depth-integrated (0–125 m) chlorophyll, zooplankton, new production, and silicate uptake are significantly enhanced in the cyclonic eddies and reduced in the anticyclonic eddies. Following the movements of the eddy center, temporal variations of phytoplankton community structure suggest that diatoms respond to cyclonic eddies strongly first and the responses last longer; then picoplankton grow after the diatoms. In the cyclonic eddies, modeled new production is 1.87 ± 0.37 mmol N m−2 d−1, which is 28% higher than the SCS basin-averaged value, while in the anticyclonic eddies, modeled new production is about 32% lower than the SCS basin mean. As a consequence, modeled detrital nitrogen export for cyclonic eddies is 41% higher than the SCS basin mean, and that for anticyclonic eddies is 31% lower than the SCS basin mean. These values experience strong interannual variations with anomalously low magnitudes found during El Nino conditions for both of the eddies and the SCS basin mean. Our results indicate that cyclonic eddies in the SCS are important sources of nutrients to the euphotic zone and therefore play a significant role in regulating biological productivity and the carbon cycle.read more
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References
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Influence of mesoscale eddies on new production in the Sargasso Sea
Dennis J. McGillicuddy,Allan R. Robinson,David A. Siegel,Hans W. Jannasch,R.J. Johnson,Tommy D. Dickey,Joe McNeil,Anthony F. Michaels,Anthony H. Knap +8 more
TL;DR: In the case of the Sargasso Sea, it is shown that the vertical flux of nutrients induced by the dynamics of mesoscale eddies is sufficient to balance the nutrient budget as mentioned in this paper.
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TL;DR: In this article, the authors show that, although plankton blooms occur in both cyclones and mode-water eddies, the biological responses differ, and they infer that the carbon export inferred from oxygen anomalies in eddy cores is one to three times as much as annual new production for the region.
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Role of eddy pumping in enhancing primary production in the ocean
TL;DR: In this paper, a pump-and-probe fluorimeter was used to evaluate the effect of cyclonic eddies on phytoplankton production in the subtropical Pacific.
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Eddy-induced enhancement of primary production in a model of the North Atlantic Ocean
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