On the characteristics of eddies in the stable atmospheric boundary layer
A discussion of the cross-spectral properties of eddies in the lowest 40 m of the nocturnal boundary layer is presented. The study involves the analysis of meteorological data collected by the British Antarctic Survey at Halley Station, Antarctica, during the austral winter of 1986. Cross-spectral a...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/520148/ https://doi.org/10.1007/BF00119808 |
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ftnerc:oai:nora.nerc.ac.uk:520148 2023-05-15T13:49:35+02:00 On the characteristics of eddies in the stable atmospheric boundary layer Rees, J.M. 1991-06 http://nora.nerc.ac.uk/id/eprint/520148/ https://doi.org/10.1007/BF00119808 unknown Springer Rees, J.M. 1991 On the characteristics of eddies in the stable atmospheric boundary layer. Boundary-Layer Meteorology, 55 (4). 325-343. https://doi.org/10.1007/BF00119808 <https://doi.org/10.1007/BF00119808> Publication - Article PeerReviewed 1991 ftnerc https://doi.org/10.1007/BF00119808 2023-02-04T19:46:36Z A discussion of the cross-spectral properties of eddies in the lowest 40 m of the nocturnal boundary layer is presented. The study involves the analysis of meteorological data collected by the British Antarctic Survey at Halley Station, Antarctica, during the austral winter of 1986. Cross-spectral analysis is used to determine whether the nature of the observed eddies is primarily turbulent or whether their structure is characteristic of coherent internal gravity waves. It is found that the cross-spectral phases indicate the presence of turbulent eddies only when the local gradient Richardson number (Ri) is less than the critical value of 1/4. Trapped modes were only observed when an off-shore wind prevailed, indicating that topographic effects are responsible for their generation. The relative phases of velocity and temperature were often observed to change with height. This can be explained by examining the underlying meteorological conditions. On several occasions, regions of counter-gradient fluxes were detected. A physical explanation of this phenomenon is proposed. Article in Journal/Newspaper Antarc* Antarctic Antarctica British Antarctic Survey Natural Environment Research Council: NERC Open Research Archive Antarctic Austral Halley Station ENVELOPE(-26.541,-26.541,-75.581,-75.581) Boundary-Layer Meteorology 55 4 325 343 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
A discussion of the cross-spectral properties of eddies in the lowest 40 m of the nocturnal boundary layer is presented. The study involves the analysis of meteorological data collected by the British Antarctic Survey at Halley Station, Antarctica, during the austral winter of 1986. Cross-spectral analysis is used to determine whether the nature of the observed eddies is primarily turbulent or whether their structure is characteristic of coherent internal gravity waves. It is found that the cross-spectral phases indicate the presence of turbulent eddies only when the local gradient Richardson number (Ri) is less than the critical value of 1/4. Trapped modes were only observed when an off-shore wind prevailed, indicating that topographic effects are responsible for their generation. The relative phases of velocity and temperature were often observed to change with height. This can be explained by examining the underlying meteorological conditions. On several occasions, regions of counter-gradient fluxes were detected. A physical explanation of this phenomenon is proposed. |
format |
Article in Journal/Newspaper |
author |
Rees, J.M. |
spellingShingle |
Rees, J.M. On the characteristics of eddies in the stable atmospheric boundary layer |
author_facet |
Rees, J.M. |
author_sort |
Rees, J.M. |
title |
On the characteristics of eddies in the stable atmospheric boundary layer |
title_short |
On the characteristics of eddies in the stable atmospheric boundary layer |
title_full |
On the characteristics of eddies in the stable atmospheric boundary layer |
title_fullStr |
On the characteristics of eddies in the stable atmospheric boundary layer |
title_full_unstemmed |
On the characteristics of eddies in the stable atmospheric boundary layer |
title_sort |
on the characteristics of eddies in the stable atmospheric boundary layer |
publisher |
Springer |
publishDate |
1991 |
url |
http://nora.nerc.ac.uk/id/eprint/520148/ https://doi.org/10.1007/BF00119808 |
long_lat |
ENVELOPE(-26.541,-26.541,-75.581,-75.581) |
geographic |
Antarctic Austral Halley Station |
geographic_facet |
Antarctic Austral Halley Station |
genre |
Antarc* Antarctic Antarctica British Antarctic Survey |
genre_facet |
Antarc* Antarctic Antarctica British Antarctic Survey |
op_relation |
Rees, J.M. 1991 On the characteristics of eddies in the stable atmospheric boundary layer. Boundary-Layer Meteorology, 55 (4). 325-343. https://doi.org/10.1007/BF00119808 <https://doi.org/10.1007/BF00119808> |
op_doi |
https://doi.org/10.1007/BF00119808 |
container_title |
Boundary-Layer Meteorology |
container_volume |
55 |
container_issue |
4 |
container_start_page |
325 |
op_container_end_page |
343 |
_version_ |
1766251776568197120 |