Elevated NH sub(4) super(+) in a neutrally buoyant hydrothermal plume

Elevated NH sub(4) super(+) in a neutrally buoyant hydrothermal plume

Anomalously high concentrations of NH sub(4) super(+) in hydrothermal vent discharge fluids were tracked in the resulting neutrally buoyant plume over the unsedimented Endeavour Segment, Juan de Fuca Ridge. Vertical profiles of NH sub(4) super(+) concentrations showed plume depth ( similar to 2025 m...

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Veröffentlicht in:Deep-sea research. Part I, Oceanographic research papers Oceanographic research papers, 1998-11, Vol.45 (11), p.1891-1902
Hauptverfasser: Cowen, J P, Wen, Xiyuan, Jones, R D, Thomson, R E
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container_end_page 1902
container_issue 11
container_start_page 1891
container_title Deep-sea research. Part I, Oceanographic research papers
container_volume 45
creator Cowen, J P
Wen, Xiyuan
Jones, R D
Thomson, R E
description Anomalously high concentrations of NH sub(4) super(+) in hydrothermal vent discharge fluids were tracked in the resulting neutrally buoyant plume over the unsedimented Endeavour Segment, Juan de Fuca Ridge. Vertical profiles of NH sub(4) super(+) concentrations showed plume depth ( similar to 2025 m) maxima of nearly 400 nM over the Endeavour Segment's main vent field, on the same order as most subsurface NH sub(4) super(+) maxima. Plume NH sub(4) super(+) values decreased to just above background deep water values (50-70 nM) in older plume water at a station 15 km southwest of the vent field, although most of the plume NH sub(4) super(+) appears to be transported beyond the ridge axial valley. Preliminary net specific NH sub(4) super(+) removal rates determined within the plume maximum (0.04-0.13 d super(-1)) and corresponding turnover times (8-28 d) are similar to values for CH sub(4) oxidation rates. The data suggest that NH sub(4) super(+) may be a significant substrate for in situ chemolithotrophic production of organic matter in the Endeavour Segment hydrothermal plume.
doi_str_mv 10.1016/S0967-0637(98)00032-6
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title Elevated NH sub(4) super(+) in a neutrally buoyant hydrothermal plume
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