Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves
One of the most successful applications of satellite-borne radar altimeter data over the oceans in recent years has been the extraction of information about long-wavelength baroclinic Rossby (or planetary) waves, which play a significant role in ocean circulation and climate dynamics. These waves cr...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.659.4042 2023-05-15T17:34:15+02:00 Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves Peter G Challenor Paolo Cipollini David Cromwell D Radon Transform Rossby Waves Challenor The Pennsylvania State University CiteSeerX Archives 2001 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.4042 http://eprints.soton.ac.uk/120/1/Challenor.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.4042 http://eprints.soton.ac.uk/120/1/Challenor.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://eprints.soton.ac.uk/120/1/Challenor.pdf text 2001 ftciteseerx 2016-01-08T16:46:04Z One of the most successful applications of satellite-borne radar altimeter data over the oceans in recent years has been the extraction of information about long-wavelength baroclinic Rossby (or planetary) waves, which play a significant role in ocean circulation and climate dynamics. These waves cross ocean basins from east to west at speeds of few centimetres per second at mid-latitudes. The cross-basin propagation time may therefore be several months or even years and an accurate estimation of the speed of the waves is important. We review the methods for obtaining information on Rossby wave velocity from altimetry data, particularly the two-dimensional Radon transform. Unfortunately the use of longitude-time plots, although it allows the estimation of the zonal phase speeds, does not give any information on the speed vector when the propagation of the waves is not purely zonal (east-west). We show how the two-dimensional Radon Transform can be generalised to three dimensions, enabling not only the true propagation velocity component to be determined, but also the direction of the waves and thus any deviation from the pure-westward case. As examples of the application of this extended technique, we show maps of direction, speed and energy of Rossby waves in the North Atlantic Ocean. 3D Radon Transform and Rossby waves – Challenor, Cipollini and Cromwell 1. Text North Atlantic Unknown |
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English |
description |
One of the most successful applications of satellite-borne radar altimeter data over the oceans in recent years has been the extraction of information about long-wavelength baroclinic Rossby (or planetary) waves, which play a significant role in ocean circulation and climate dynamics. These waves cross ocean basins from east to west at speeds of few centimetres per second at mid-latitudes. The cross-basin propagation time may therefore be several months or even years and an accurate estimation of the speed of the waves is important. We review the methods for obtaining information on Rossby wave velocity from altimetry data, particularly the two-dimensional Radon transform. Unfortunately the use of longitude-time plots, although it allows the estimation of the zonal phase speeds, does not give any information on the speed vector when the propagation of the waves is not purely zonal (east-west). We show how the two-dimensional Radon Transform can be generalised to three dimensions, enabling not only the true propagation velocity component to be determined, but also the direction of the waves and thus any deviation from the pure-westward case. As examples of the application of this extended technique, we show maps of direction, speed and energy of Rossby waves in the North Atlantic Ocean. 3D Radon Transform and Rossby waves – Challenor, Cipollini and Cromwell 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Peter G Challenor Paolo Cipollini David Cromwell D Radon Transform Rossby Waves Challenor |
spellingShingle |
Peter G Challenor Paolo Cipollini David Cromwell D Radon Transform Rossby Waves Challenor Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves |
author_facet |
Peter G Challenor Paolo Cipollini David Cromwell D Radon Transform Rossby Waves Challenor |
author_sort |
Peter G Challenor |
title |
Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves |
title_short |
Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves |
title_full |
Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves |
title_fullStr |
Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves |
title_full_unstemmed |
Use of the 3D Radon Transform to Examine the Properties of Oceanic Rossby Waves |
title_sort |
use of the 3d radon transform to examine the properties of oceanic rossby waves |
publishDate |
2001 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.4042 http://eprints.soton.ac.uk/120/1/Challenor.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
http://eprints.soton.ac.uk/120/1/Challenor.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.4042 http://eprints.soton.ac.uk/120/1/Challenor.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766133029968805888 |