CPIES: Current and Pressure recording Inverted Echo Sounder - PowerPoint PPT Presentation

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CPIES: Current and Pressure recording Inverted Echo Sounder

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CPIES: Current and Pressure recording Inverted Echo Sounder. Measures: ... Deployments of up to 5 years. Results from PIES & CPIES measurements ... – PowerPoint PPT presentation

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Title: CPIES: Current and Pressure recording Inverted Echo Sounder


1
CPIES Current and Pressure recording Inverted
Echo Sounder
Measures Round trip travel times of acoustic
pulses to sea surface and back. Bottom
Pressure Bottom Temperature Currents 50m above
bottom Acoustic release and relocation aids Data
Telemetry available Deployments of up to 5 years
2
Results from PIES CPIES measurements
  • One PIES profiles of specific volume anomaly,
  • steric height mass-loading component SSH
  • __________________________________________________
    ______
  • Two PIES / profiles of baroclinic velocity /
  • CPIES plus barotropic referenced
    velocity
  • absolute velocity profile
  • 1-D line velocity transect, absolute
    transports
  • __________________________________________________
    ______
  • Three PIES / profiles of baroclinic velocity
    vector /
  • CPIES plus barotropic velocity vector
  • absolute velocity vector profile
  • 2-D array 4-D maps of velocity and
    density structure

3
Tight empirical relationships exist between
acoustic travel time and Fofonoff Potential and
Geopotential Anomaly
Mass Transport Streamfunction
Baroclinic Velocity Streamfunction
WOCE SR3 examples, in SAF south of Australia
4
View the vertical structure of Specific Volume
Anomaly, d, in streamfunction coordinates
When indexed by F3000 the d lookup table looks
like this
d
10-5 kg/m3
F3000 (m2 s-1)
WOCE SR3 examples, in SAF south of Australia
5
View the vertical structure of Specific Volume
Anomaly, d, in streamfunction coordinates
When indexed by t3000 the d lookup table looks
like this
When indexed by F3000 the d lookup table looks
like this
d
10-5 kg/m3
F3000 (m2 s-1)
t3000 (s)
6
Two IESs Profiles of baroclinic velocity
7
Eastward baroclinic transports crossing WOCE SR3
Solid CTDs (S. Rintoul) Dashed IES method
Transports relative to 3000 dbar
8
Three IESs, 2-D array profiles of BC
velocity vector
SYNOP moored Current Meter measurements and IESs
stack of velocities from Current Meters gt
stack of velocities from lt IESs (65 km
spacing)
differences can be entirely attributed to
point sampling vs. lateral-average sampling
differences
9
A CPIES mapping array determines the velocity
field as the sum of a baroclinic profile plus
barotropic reference velocity
The BC velocities are aligned in a single
direction (called equivalent barotropic)
adding a BT component can cause turning.
10
Mesoscale array of PIESs and deep CMs Abyssal
cyclones develop under steep upper-jet troughs
  • Maps show three fields
  • Pressure field anomaly at 3500 m In color
  • Depth of the 12C isotherm contoured at 200
    m intervals
  • Velocity vectors at 3500 m

Tick marks 50 km intervals
11
Mesoscale array of PIESs and deep CMs Abyssal
cyclones develop under steep upper-jet troughs
12
Summary
  • PIES with deep current reference, e.g., CPIES
    capabilities
  • 1-D transects provide absolute velocity and
    transport estimates
  • Cost-effective for high horizontal spatial
    resolution
  • Geostrophic velocities are laterally integrated
    (intrinsically)
  • High temporal sampling for extended time periods
    (up to 5 years)
  • 2-D arrays of CPIESs can provide velocity
    structure
  • With mesoscale spatial and temporal resolution
  • Well-resolved maps allow for dynamical diagnoses
    case-studies

13
  • End of planned presentation
  • Some extra slides follow

14
IES-estimated temperatures agree with measured
temperatures In the Sub-Antarctic Front south of
Australia
Measured temperatures
IES-estimated temperatures
15
Assemble regional hydrographic data set
T (oC)
Hydrographic data sorted by tau
Choose reference ?_index
Sort hydrographic data by ?_index
examples from Gulf of Mexico
t
16
Fit cubic splines to data
T (oC)
t
17
Final GEM field a lookup table
T (oC)
t
18
Final GEM field a lookup table
T (oC)
t
19
Three PIES and a deep CM yield profiles of
absolute velocity vectors
.
MMS / SAIC - Gulf of Mexico moorings
20
IES-estimated currents agree with measured
currents In the Sub-Antarctic Front south of
Australia
Dotted Measured currents Solid
IES-estimated currents
21
A CPIES mapping array determines the velocity
field as the sum of a baroclinic profile plus
barotropic reference velocity
The BC velocities are aligned in a single
direction (called equivalent barotropic)
adding a BT component can cause turning.
22
Mapping and case studies, contdsteep meander
loop, deep eddy field, and RAFOS tracks
Tick marks 50 km apart
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