ADCP QC

Formation of an expert working group

Term of Reference

Validation/Calibration

Existing QC

Future QC

Product development

ADCP QCForm a Working group of experts and practitionersand follow the lead from the biophysical & CTD working groups

Invite experts from across the nodes/mooring sub facilities and ABOS

Term of ReferenceTo develop an integrated and scientifically robust strategyfor the calibration, validation and interpretation of ADCP data, as collected by IMOS facilities

ADCP QCRepresentatives from all node and sub-facility leaders

eMII Proctor GalibertAustralian Bluewater Observing System (ABOS)

Sloyan CowanQld & N Aus Steinberg DK Williams WAIMOS Pattiaratchi Slawinski/Mihanovic???NSW Roughan Morris replacement???ANMN Lynch ???Others on the fringe with expertise e.g. Unis, Industry & Manufacturers

Validation: Pre & Post deployment bath

Surface current: Comparison with radar and drifters

Mantovanelli et al Oceans’11

Validation: intercomparison

Mantovanelli et al Oceans’11

Temporal time series of HF radar (blue) and ADCP speeds for the u-component (red) and

v-component (green) of the total flow measured between January and April of 2010 at HIS (a,b))

ADCP QC

Sprintall Dec 2007

ADCP is a complex indirect measurement of current through acoustic backscatter from the water column.

The IMOS toolbox used for moorings processing has implemented some basic ADCP QC used by CSIRO for INSTANT deep water moorings. These need reviewing further development.

INSTANT QC

Sprintall

Sprintall Dec 2007 (via Cowley)

SOFS2ea

Cowley 2012

Echo amplitude test applies to surface bins only.

Where the difference between consecutive bins is greater than the threshold, the point and all above it are discarded.

SOFS2hvel

Cowley 2012

Where the absolute horizontal velocity is greater than the threshold, the point is discarded

SOFS2vvel

Cowley 2012

Where the absolute vertical velocity is greater than the threshold, the point is discarded

SOFS2cmag

Cowley 2012

Where 3 or more of the 4 beams are less than the threshold, the point is discarded

SOFS2pg

Cowley 2012

Using the 4-beam solution, anything less than the threshold is discarded

SOFS2zonal

Cowley 2012

Shows the zonal velocity before and after QC

What else needs doing ?

ADCP QC

IMOS, driven by science planning• Decisions about what to observe, and where, are driven by Science Plans addressing

five major research themes:

• Science Plans are being internationally peer reviewed

ADCP QC

Surface current

Sidelobe & top bin

Ringing & bottom bin

Pitch & roll

Mooring interference

Fish interference

High Backscatter

Turbidity

ADCP Interference

ADCP Interference

ADCP backscatter

ADCP QCFuture Product development

Boundary current index (ITF, EAC, Leeuwin, Flinders etc)

Tidal Current Analysis

Internal waves

Waves

Backscatter: Turbidity

Productivity/biomass estimates

Turbulence

TIMOR South: Current Profiles

Speed

Direction

N-S component

E-W component

Pressure

Jul 2010 Dec 2010

Ningaloo National Reference Station

Australian National Network in Marine Science ANNiMS Grant (2011) - “The Importance of Internal Waves in the Stimulation of Primary Productivity at Ningaloo Reef” R.Lowe, N. Jones, R. Brinkman and P. Strutton

Timor Sea Tides

Deep mooring: • Surface and internal-tide energy have

similar magnitudes• Internal-tide energy follows the local

spring-neap cycle.

Shallow mooring:• Internal-tide energy is an order of

magnitude smaller than surface tide energy

• Internal-tide energy is only present after the 1st of September

Internal-tide generation on 5 DEC• Most generation occurs in the deepest

part of the Timor Sea

Kelly et al., “Internal tides in the Timor Sea and on the Australian North West Shelf” AMSA

10/03 11/03

20

40

60

800

50

100 cm/s

10/03 11/03

20

40

60

800

180

360 deg

Dep

th (

m)

10/03 11/03

20

40

60

80 -50

0

50 cm/s

10/03 11/03

20

40

60

80 -50

0

50 cm/s

10/03 11/03

20

40

60

80 -10

0

10 cm/s

10/03 11/0320

25

30

Date (2004 CST)

KarmtRDI ADCP 1947

20

40

60

Velocity Magnitude (cm/s)

Velocity Direction (deg)

East Velocity (cm/s)

North Velocity (cm/s)

Vert. Velocity (cm/s)

Karmt Shoals

ftp://dataupload.emii.org.au/pub/ADCP_QC_Documentation/