An ERS 1 synthetic aperture radar image of atmospheric lee waves
An ERS 1 synthetic aperture radar (SAR) image of the island Hopen shows a distinct 7.6-km wavelength wave phenomenon near the island. This wave phenomenon is interpreted as the surface imprint on open water of atmospheric lee waves. The pattern is visible in the SAR image, since the lee waves modula...
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Language: | English |
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American Geophysical Union
1994
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Online Access: | https://hdl.handle.net/1956/814 https://doi.org/10.1029/94jc01392 |
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ftunivbergen:oai:bora.uib.no:1956/814 2023-05-15T15:40:01+02:00 An ERS 1 synthetic aperture radar image of atmospheric lee waves Vachon, P. W. Johannessen, Ola M. Johannessen, Johnny A. 1994-11-15 4582465 bytes application/pdf https://hdl.handle.net/1956/814 https://doi.org/10.1029/94jc01392 eng eng American Geophysical Union urn:issn:0148-0227 https://hdl.handle.net/1956/814 https://doi.org/10.1029/94jc01392 Copyright 1994 American Geophysical Union Meteorology Oceanography Remote sensing Journal article Peer reviewed 1994 ftunivbergen https://doi.org/10.1029/94jc01392 2023-03-14T17:40:50Z An ERS 1 synthetic aperture radar (SAR) image of the island Hopen shows a distinct 7.6-km wavelength wave phenomenon near the island. This wave phenomenon is interpreted as the surface imprint on open water of atmospheric lee waves. The pattern is visible in the SAR image, since the lee waves modulate the horizontal wind speed near the ocean surface which, in turn, modulates the surface roughness and the radar cross section. The physical setting for the observation is presented and discussed. The lower bound on horizontal wind speed modulation is estimated to range from 3±2 ms−1 (for the wind speed minima) to 12±2 ms−1 (for the wind speed maxima) based upon the observed radar cross-section modulation and the ERS 1 scatterometer wind retrieval model CMOD4. The wavelength and wind speed modulation are consistent with linear lee wave model predications. The model uses an atmosphere with an exponential profile of the Scorer parameter (ratio of buoyancy frequency to wind speed) to represent a shallow, ground-based inversion layer observed at Bear Island and a bell-shaped barrier to represent the forcing effects of Hopen. Article in Journal/Newspaper Bear Island Hopen University of Bergen: Bergen Open Research Archive (BORA-UiB) Bear Island ENVELOPE(-67.250,-67.250,-68.151,-68.151) Hopen ENVELOPE(9.279,9.279,63.379,63.379) Journal of Geophysical Research 99 C11 22483 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Meteorology Oceanography Remote sensing |
spellingShingle |
Meteorology Oceanography Remote sensing Vachon, P. W. Johannessen, Ola M. Johannessen, Johnny A. An ERS 1 synthetic aperture radar image of atmospheric lee waves |
topic_facet |
Meteorology Oceanography Remote sensing |
description |
An ERS 1 synthetic aperture radar (SAR) image of the island Hopen shows a distinct 7.6-km wavelength wave phenomenon near the island. This wave phenomenon is interpreted as the surface imprint on open water of atmospheric lee waves. The pattern is visible in the SAR image, since the lee waves modulate the horizontal wind speed near the ocean surface which, in turn, modulates the surface roughness and the radar cross section. The physical setting for the observation is presented and discussed. The lower bound on horizontal wind speed modulation is estimated to range from 3±2 ms−1 (for the wind speed minima) to 12±2 ms−1 (for the wind speed maxima) based upon the observed radar cross-section modulation and the ERS 1 scatterometer wind retrieval model CMOD4. The wavelength and wind speed modulation are consistent with linear lee wave model predications. The model uses an atmosphere with an exponential profile of the Scorer parameter (ratio of buoyancy frequency to wind speed) to represent a shallow, ground-based inversion layer observed at Bear Island and a bell-shaped barrier to represent the forcing effects of Hopen. |
format |
Article in Journal/Newspaper |
author |
Vachon, P. W. Johannessen, Ola M. Johannessen, Johnny A. |
author_facet |
Vachon, P. W. Johannessen, Ola M. Johannessen, Johnny A. |
author_sort |
Vachon, P. W. |
title |
An ERS 1 synthetic aperture radar image of atmospheric lee waves |
title_short |
An ERS 1 synthetic aperture radar image of atmospheric lee waves |
title_full |
An ERS 1 synthetic aperture radar image of atmospheric lee waves |
title_fullStr |
An ERS 1 synthetic aperture radar image of atmospheric lee waves |
title_full_unstemmed |
An ERS 1 synthetic aperture radar image of atmospheric lee waves |
title_sort |
ers 1 synthetic aperture radar image of atmospheric lee waves |
publisher |
American Geophysical Union |
publishDate |
1994 |
url |
https://hdl.handle.net/1956/814 https://doi.org/10.1029/94jc01392 |
long_lat |
ENVELOPE(-67.250,-67.250,-68.151,-68.151) ENVELOPE(9.279,9.279,63.379,63.379) |
geographic |
Bear Island Hopen |
geographic_facet |
Bear Island Hopen |
genre |
Bear Island Hopen |
genre_facet |
Bear Island Hopen |
op_relation |
urn:issn:0148-0227 https://hdl.handle.net/1956/814 https://doi.org/10.1029/94jc01392 |
op_rights |
Copyright 1994 American Geophysical Union |
op_doi |
https://doi.org/10.1029/94jc01392 |
container_title |
Journal of Geophysical Research |
container_volume |
99 |
container_issue |
C11 |
container_start_page |
22483 |
_version_ |
1766372116733624320 |