Entrainment and vertical transport of deep-ocean water by buoyant hydrothermal plumes
摘要：
Submarine hydrothermal vents produce effluent plumes in the water column which can be easily detected with tracers such as 3 He, manganese and methane 1–3 . Comparison of the tracer concentrations and temperature anomalies in such plumes with direct measurements of the pure vent waters shows that the plumes are typically mixtures of 1 part vent water with 10 4 parts ambient sea water 1 . However, the extent to which hydrothermal plumes entrain and transport sea water and contribute to deep-ocean mixing is not known. We present here hydrographie data collected in the vicinity of an active hydrothermal field on the Endeavour segment of the Juan de Fuca Ridge where a well-defined effluent layer resides in the water column 200 m above the depth of the vent field. The temperature and salinity signature of this layer indicates that a small volume of hot vent water can be very efficient at entraining ambient sea water. Directly above the Endeavour vent field, the effluent layer is composed of 0.01% vent water, 30% ambient water normally found at that depth and 70% entrained water which has been transported from deeper in the water column.
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DOI：
10.1038/316621a0
被引量：
年份：
1985
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