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Analysis of shipboard ADCP data from RRS Discovery Cruise D324: RAPID Array Eastern Boundary

Analysis of shipboard ADCP data from RRS Discovery Cruise D324: RAPID Array Eastern Boundary
Analysis of shipboard ADCP data from RRS Discovery Cruise D324: RAPID Array Eastern Boundary
Analysis of underway ADCP data from cruise D324 (RAPID Array Eastern Boundary)
revealed three potential biases in the measurements. An investigation of these features is
presented here, along with a physical explanation or strategy for removal where appropriate.
The first feature is a series of barotropic velocity bands in the along and cross track
measurements. These cannot be explained by either heading correction errors or tidal motions,
implying a strong eddy field at 26N during the period of observation. The second feature is an
along track forward bias caused by bubble interference with the ADCP signal. A strategy for
removal is presented using filters applied to raw ADCP data, however future implementation is
only recommended with careful selection of suitable filter parameters. The final feature is an
S-shaped along-track velocity bias resulting from interaction of ADCP side-lobes with a strong
biological scattering horizon while underway. Similar biases have been observed elsewhere in
the ocean and a physical explanation is given. A description of ADCP setup, data processing
routines and a comparison with geostrophic velocities calculated from CTD dips is also
presented.
12
National Oceanography Centre Southampton
Atkinson, C.
760a87ea-b947-437e-a511-5a3afcf36fa4
Atkinson, C.
760a87ea-b947-437e-a511-5a3afcf36fa4

Atkinson, C. (2008) Analysis of shipboard ADCP data from RRS Discovery Cruise D324: RAPID Array Eastern Boundary (National Oceanography Centre Southampton Internal Document, 12) Southampton, UK. National Oceanography Centre Southampton 16pp.

Record type: Monograph (Project Report)

Abstract

Analysis of underway ADCP data from cruise D324 (RAPID Array Eastern Boundary)
revealed three potential biases in the measurements. An investigation of these features is
presented here, along with a physical explanation or strategy for removal where appropriate.
The first feature is a series of barotropic velocity bands in the along and cross track
measurements. These cannot be explained by either heading correction errors or tidal motions,
implying a strong eddy field at 26N during the period of observation. The second feature is an
along track forward bias caused by bubble interference with the ADCP signal. A strategy for
removal is presented using filters applied to raw ADCP data, however future implementation is
only recommended with careful selection of suitable filter parameters. The final feature is an
S-shaped along-track velocity bias resulting from interaction of ADCP side-lobes with a strong
biological scattering horizon while underway. Similar biases have been observed elsewhere in
the ocean and a physical explanation is given. A description of ADCP setup, data processing
routines and a comparison with geostrophic velocities calculated from CTD dips is also
presented.

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Published date: October 2008
Additional Information: Deposited at authors request

Identifiers

Local EPrints ID: 63317
URI: https://eprints.soton.ac.uk/id/eprint/63317
PURE UUID: e0d3bb99-1343-434d-b16f-ccb457a69f67

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Date deposited: 02 Oct 2008
Last modified: 13 Mar 2019 20:25

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