Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles
Profiles of absolute velocity are difficult to obtain in the ocean, especially over long periods of time at the same location. This paper presents a method of estimating full water column absolute horizontal velocity profiles as a function of time by combining historical hydrography with the measure...
Main Authors: | , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@URI
2002
|
Subjects: | |
Online Access: | https://digitalcommons.uri.edu/gsofacpubs/404 https://doi.org/10.1175/1520-0426(2002)019<1653:CIESAH>2.0.CO;2 https://digitalcommons.uri.edu/context/gsofacpubs/article/1335/viewcontent/Watts_Tracey_CombiningInverted_2002.pdf |
id |
ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1335 |
---|---|
record_format |
openpolar |
spelling |
ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1335 2023-07-30T04:07:03+02:00 Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles Meinen, Christopher S. Luther, Douglas S. Watts, D. Randolph Tracey, Karen L. Chave, Alan D. Richman, James 2002-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/404 https://doi.org/10.1175/1520-0426(2002)019<1653:CIESAH>2.0.CO;2 https://digitalcommons.uri.edu/context/gsofacpubs/article/1335/viewcontent/Watts_Tracey_CombiningInverted_2002.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/404 doi:10.1175/1520-0426(2002)019<1653:CIESAH>2.0.CO;2 https://digitalcommons.uri.edu/context/gsofacpubs/article/1335/viewcontent/Watts_Tracey_CombiningInverted_2002.pdf Graduate School of Oceanography Faculty Publications text 2002 ftunivrhodeislan https://doi.org/10.1175/1520-0426(2002)019<1653:CIESAH>2.0.CO;2 2023-07-17T18:56:45Z Profiles of absolute velocity are difficult to obtain in the ocean, especially over long periods of time at the same location. This paper presents a method of estimating full water column absolute horizontal velocity profiles as a function of time by combining historical hydrography with the measurements from two separate instruments, the inverted echo sounder (IES) and the horizontal electric field recorder (HEFR). Hydrography is used to construct temperature, salinity, and specific volume anomaly characteristics as functions of the independent variables pressure and seafloor-to-sea-surface round-trip acoustic travel time (τ). Each IES measured τ is combined with these two-dimensional characteristics to estimate the profile of specific volume anomaly, which then is integrated vertically to obtain profiles of geopotential height anomaly (Δϕ). Profiles of Δϕ from adjacent IES sites are differenced to yield vertical profiles of relative geostrophic velocity. Horizontal electric fields arising from the vertically averaged horizontal water velocity provide the requisite referencing of the IES-derived relative velocities. Comparisons are presented between HEFR+IES absolute velocities in the Southern Ocean near 51°S, 143.5°E and absolute velocities determined via hydrography, acoustic Doppler current profiler, and current meter. Text Southern Ocean University of Rhode Island: DigitalCommons@URI Southern Ocean |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
description |
Profiles of absolute velocity are difficult to obtain in the ocean, especially over long periods of time at the same location. This paper presents a method of estimating full water column absolute horizontal velocity profiles as a function of time by combining historical hydrography with the measurements from two separate instruments, the inverted echo sounder (IES) and the horizontal electric field recorder (HEFR). Hydrography is used to construct temperature, salinity, and specific volume anomaly characteristics as functions of the independent variables pressure and seafloor-to-sea-surface round-trip acoustic travel time (τ). Each IES measured τ is combined with these two-dimensional characteristics to estimate the profile of specific volume anomaly, which then is integrated vertically to obtain profiles of geopotential height anomaly (Δϕ). Profiles of Δϕ from adjacent IES sites are differenced to yield vertical profiles of relative geostrophic velocity. Horizontal electric fields arising from the vertically averaged horizontal water velocity provide the requisite referencing of the IES-derived relative velocities. Comparisons are presented between HEFR+IES absolute velocities in the Southern Ocean near 51°S, 143.5°E and absolute velocities determined via hydrography, acoustic Doppler current profiler, and current meter. |
format |
Text |
author |
Meinen, Christopher S. Luther, Douglas S. Watts, D. Randolph Tracey, Karen L. Chave, Alan D. Richman, James |
spellingShingle |
Meinen, Christopher S. Luther, Douglas S. Watts, D. Randolph Tracey, Karen L. Chave, Alan D. Richman, James Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles |
author_facet |
Meinen, Christopher S. Luther, Douglas S. Watts, D. Randolph Tracey, Karen L. Chave, Alan D. Richman, James |
author_sort |
Meinen, Christopher S. |
title |
Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles |
title_short |
Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles |
title_full |
Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles |
title_fullStr |
Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles |
title_full_unstemmed |
Combining Inverted Echo Sounder and Horizontal Electric Field Recorder Measurements to Obtain Absolute Velocity Profiles |
title_sort |
combining inverted echo sounder and horizontal electric field recorder measurements to obtain absolute velocity profiles |
publisher |
DigitalCommons@URI |
publishDate |
2002 |
url |
https://digitalcommons.uri.edu/gsofacpubs/404 https://doi.org/10.1175/1520-0426(2002)019<1653:CIESAH>2.0.CO;2 https://digitalcommons.uri.edu/context/gsofacpubs/article/1335/viewcontent/Watts_Tracey_CombiningInverted_2002.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/404 doi:10.1175/1520-0426(2002)019<1653:CIESAH>2.0.CO;2 https://digitalcommons.uri.edu/context/gsofacpubs/article/1335/viewcontent/Watts_Tracey_CombiningInverted_2002.pdf |
op_doi |
https://doi.org/10.1175/1520-0426(2002)019<1653:CIESAH>2.0.CO;2 |
_version_ |
1772820123531345920 |