3.3.2 PRICE. Central Question How do you decide on your selling price?
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O
ET
Central question:
How do plumes and currents interact above the Main Endeavour vent field to affect the measurement of hydrothermal
heat flux?
Approach:
Submarine volcanic heat flux and hydrography: perspectives from Northeast Pacific
observations, theory, and experiments
Proposed dissertation for Scott Veirs in the UW School of Oceanography
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Endeavour Segment of the Juan de Fuca RidgeFlow Mow cruise (August, 2000) study site
HIGH BUOYANCY FLUX FIELDS:
SDF = Salty Dawg
HRF = High Rise
MEF = Main Endeavour
MF = Mothra
LOW BUOYANCY FLUX FIELDS:
C = Cirque
D = Dune
CB = Clam Bed
Q = Quebec
New or suspected fields Bathymetric contour interval: 100m
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Main Endeavour hydrothermal vent fieldAxial valley bathymetry and key hydrographic observations
1 km
100mCTD
current
vents
1995
2000
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Overview of current and hydrographic observations
MEF Sea floor
Ridge crest
m above MEF sea
floor
2210
1850
2100
Depth
250
50
150
200
100
2168
2070
2000
1900
1800
~350
ABE survey
CTD “ribbon”
CTD “curtain”
CTD “VOC”Upper control volume
Lower control volume
400m wide
800m long ~500m N&S
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Hydrographic variability I
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Hydrographic variability II
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Currents in the MEF vicinity
~200m NE of MEF, 1995 ~1km S of MEF, 2000
depth/mab 2175/25 1900/300 2168/15 1968/215
Mean [cm/s] 1 to N 5 to SW 1 to N 5 to SSW
Max [cm/s] 5 67 9 13
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q_adv
Sea floor
Ridge crest
250
50
150
200
100
mab 2200
1800
2100
Depth
q_sidesq_top
q_focused + q_diffuse + q_conduct
MEF heat flux calculation
q ~ AU, = ref + (z/Sz)(S-Sref)
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Synthesis through “puff” models
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Plume distributions in stratified, oscillatory cross flow
Current and surface waves
Oscillating jet
Lam and Xia, May, 2001
• Translate source with stepper moter• Concentration field from light sheet(s) and conductivity probeConductivity probe
Carriage
Stratified fluid
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Interconnecting observation, theory, and experiment
Observations
Assumptions
Approaches
Products
CTD Currents MEF/sources
q_top +
q_sides
q_adv q variance
Puff model Lab workq~AU
definition and interpolation, A integration, U extrapolation; Scaling, dimensional analysis; Advection
dominates rotation
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Frequencies with dominant spectral power:
Vertical coherence: 10-100m
Horizontal coherence: >50km
Other sources of data?
• rotary above the ridge crest
• rectified within the axial valley
• mean flows at both levels