Physical Mechanisms Routing Nutrients in the Central Red Sea

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2017
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Zarokanellos, Nikolaos D.
Kürten, Benjamin
Churchill, James H.
Roder, Cornelia
Abualnaja, Yasser
Jones, Burton H.
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Journal of Geophysical Research: Oceans. AGU Publications. 2017, 122(11), pp. 9032-9046. ISSN 2169-9275. eISSN 2169-9291. Available under: doi: 10.1002/2017JC013017
Zusammenfassung

Mesoscale eddies and boundary currents play a key role in the upper layer circulation of the Red Sea. This study assesses the physical and biochemical characteristics of an eastern boundary current (EBC) and recurrent eddies in the central Red Sea (CRS) using a combination of in situ and satellite observations. Hydrographic surveys in November 2013 (autumn) and in April 2014 (spring) in the CRS (22.15°N–24.1°N) included a total of 39 and 27 CTD stations, respectively. In addition, high‐resolution hydrographic data were acquired in spring 2014 with a towed undulating vehicle (ScanFish). In situ measurements of salinity, temperature, chlorophyll fluorescence, colored dissolved organic matter (CDOM), and dissolved nitrate: phosphorous ratios reveal distinct water mass characteristics for the two periods. An EBC, observed in the upper 150 m of the water column during autumn, transported low‐salinity and warm water from the south toward the CRS. Patches of the low‐salinity water of southern origin tended to contain relatively high concentrations of chlorophyll and CDOM. The prominent dynamic feature observed in spring was a cyclonic/anticyclonic eddy pair. The cyclonic eddy was responsible for an upward nutrient flux into the euphotic zone. Higher chlorophyll and CDOM concentrations, and concomitant lower nitrate:phosphorous ratios indicate the influence of the EBC in the CRS at the end of the stratified summer period.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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eastern boundary current, eddy pair, Gulf of Aden surface water, Gulf of Aden intermediate water, central Red Sea (CRS)
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ISO 690ZAROKANELLOS, Nikolaos D., Benjamin KÜRTEN, James H. CHURCHILL, Cornelia RODER, Christian R. VOOLSTRA, Yasser ABUALNAJA, Burton H. JONES, 2017. Physical Mechanisms Routing Nutrients in the Central Red Sea. In: Journal of Geophysical Research: Oceans. AGU Publications. 2017, 122(11), pp. 9032-9046. ISSN 2169-9275. eISSN 2169-9291. Available under: doi: 10.1002/2017JC013017
BibTex
@article{Zarokanellos2017-11-22Physi-50765,
  year={2017},
  doi={10.1002/2017JC013017},
  title={Physical Mechanisms Routing Nutrients in the Central Red Sea},
  number={11},
  volume={122},
  issn={2169-9275},
  journal={Journal of Geophysical Research: Oceans},
  pages={9032--9046},
  author={Zarokanellos, Nikolaos D. and Kürten, Benjamin and Churchill, James H. and Roder, Cornelia and Voolstra, Christian R. and Abualnaja, Yasser and Jones, Burton H.}
}
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