2005
DOI: 10.1029/2004gl022342
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Geothermal heating and the properties of bottom water in Cascadia Basin

Abstract: [1] A new compilation of CTD data sheds light on the circulation and properties of bottom water within Cascadia Basin. A relatively high salinity water mass is revealed in a region of likely bottom water inflow east of the Blanco Fracture Zone. Water mass distributions and the deep geostrophic shear field are consistent with a general cyclonic circulation within the basin and suggest a northward-flowing boundary current next to the deep continental slope. Shifts in temperature-salinity relationships are consis… Show more

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Cited by 6 publications
(12 citation statements)
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References 12 publications
(16 reference statements)
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“…As with the North Pacific silica plume flux estimates, we can use a simple box model to provide an independent estimate of the silica source strength within Cascadia Basin. The heat budget for Cascadia Basin indicates a residence time of a less than 1 year for the bottom water, consistent with geostrophic estimates of northward bottom water currents of 1 to 2 cm/s relative to reference levels between 1500 to 2200 dbar [HJB05]. The anomalously high geothermal heating on the eastern flank of the Juan de Fuca Ridge decreases the density of the bottom water mass, so that circulation within this constrained basin flows “uphill” as the depth of the seafloor systematically shallows from south to north.…”
Section: Partitioning the Silica Sourcesupporting
confidence: 63%
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“…As with the North Pacific silica plume flux estimates, we can use a simple box model to provide an independent estimate of the silica source strength within Cascadia Basin. The heat budget for Cascadia Basin indicates a residence time of a less than 1 year for the bottom water, consistent with geostrophic estimates of northward bottom water currents of 1 to 2 cm/s relative to reference levels between 1500 to 2200 dbar [HJB05]. The anomalously high geothermal heating on the eastern flank of the Juan de Fuca Ridge decreases the density of the bottom water mass, so that circulation within this constrained basin flows “uphill” as the depth of the seafloor systematically shallows from south to north.…”
Section: Partitioning the Silica Sourcesupporting
confidence: 63%
“…This former near‐bottom water then becomes the general source for the North Pacific silica plume at 2300 meters depth [TJ92; Lupton , 1998]. While it is clear that additional observations of currents, mixing and seafloor heat flux are needed to verify and better quantify Cascadia Basin's deep circulation, consistency between water mass properties, the deep geostrophic shear field and the timescale constrained by seafloor heating [HJB05] suggest that the basin‐scale picture is likely to be correct to first‐order.…”
Section: Potential Sources Of Silica To Maintain the Middepth Plumementioning
confidence: 99%
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“…Again, although the geographical setting is different, a similar mechanism may also be responsible for the drop in temperatures that we observe following the observed thermal spikes. Along the Cascadia margin, a chronic geothermally heated bottom boundary layer is found east of Cascadia Sea Channel [ Hautala et al ., , ]. Colder bottom water is located both to the south of this site in the Blanco Saddle and to the west in the Cascadia Sea Channel.…”
Section: Discussionmentioning
confidence: 99%