Interaction of Submeso Motions in the Antarctic Stable Boundary Layer
Submesomotions add complexities to the structure of the stable boundary layer. Such motions include horizontal meandering and gravity waves, in particular when the large-scale flow is weak. The coexistence and interaction of such submeso motions is investigated through the analysis of data collected...
Published in: | Boundary-Layer Meteorology |
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Online Access: | http://hdl.handle.net/11576/2669502 https://doi.org/10.1007/s10546-019-00426-7 |
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ftunivurbino:oai:ora.uniurb.it:11576/2669502 2024-04-14T08:04:13+00:00 Interaction of Submeso Motions in the Antarctic Stable Boundary Layer CAVA, DANIELA MORTARINI, LUCA Anfossi, Domenico Giostra, Umberto Cava, Daniela Mortarini, Luca Anfossi, Domenico Giostra, Umberto 2019 http://hdl.handle.net/11576/2669502 https://doi.org/10.1007/s10546-019-00426-7 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000463665400001 volume:171 issue:2 firstpage:151 lastpage:173 numberofpages:23 journal:BOUNDARY-LAYER METEOROLOGY http://hdl.handle.net/11576/2669502 doi:10.1007/s10546-019-00426-7 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85060209659 Gravity waves · Horizontal meandering · Intermittent turbulence · Stable boundary layer · Wind-direction variability info:eu-repo/semantics/article 2019 ftunivurbino https://doi.org/10.1007/s10546-019-00426-7 2024-03-21T17:05:38Z Submesomotions add complexities to the structure of the stable boundary layer. Such motions include horizontal meandering and gravity waves, in particular when the large-scale flow is weak. The coexistence and interaction of such submeso motions is investigated through the analysis of data collected in Antarctica, in persistent conditions of strong atmospheric stratification. Detected horizontal meandering is frequently associated with temperature oscillations characterized by similar time scales (30 min) at all levels (2, 4.5 and 10 m). In contrast, dirty gravity waves superimposed on horizontal meandering are detected only at the highest level, characterized by time scales of a few minutes. The meandering produces an energy peak in the low-frequency spectral range, well fitted by a spectral model previously proposed for low wind speeds. The coexistence of horizontal and vertical oscillations is observed in the presence of large wind-direction shifts superimposed on the gradual flow meandering. Such shifts are often related to the variation of the mean flow dynamics, but also to intermittent events, localized in time, which do not produce a variation in the mean wind direction and that are associated with sharp decreases in wind speed and temperature. The noisy gravity waves coexisting with horizontal meandering persist only for a few cycles and produce bursts of turbulentmixing close to the ground, affecting the exchange processes between the surface and the stable boundary layer. The results confirm the importance of sharp wind-direction changes at lowwind speed in the stable atmosphere and suggest a possible correlation between observed gravity waves and dynamical instabilities modulated by horizontal meandering. Article in Journal/Newspaper Antarc* Antarctic Antarctica Università degli Studi di Urbino: CINECA IRIS Antarctic The Antarctic Boundary-Layer Meteorology 171 2 151 173 |
institution |
Open Polar |
collection |
Università degli Studi di Urbino: CINECA IRIS |
op_collection_id |
ftunivurbino |
language |
English |
topic |
Gravity waves · Horizontal meandering · Intermittent turbulence · Stable boundary layer · Wind-direction variability |
spellingShingle |
Gravity waves · Horizontal meandering · Intermittent turbulence · Stable boundary layer · Wind-direction variability CAVA, DANIELA MORTARINI, LUCA Anfossi, Domenico Giostra, Umberto Interaction of Submeso Motions in the Antarctic Stable Boundary Layer |
topic_facet |
Gravity waves · Horizontal meandering · Intermittent turbulence · Stable boundary layer · Wind-direction variability |
description |
Submesomotions add complexities to the structure of the stable boundary layer. Such motions include horizontal meandering and gravity waves, in particular when the large-scale flow is weak. The coexistence and interaction of such submeso motions is investigated through the analysis of data collected in Antarctica, in persistent conditions of strong atmospheric stratification. Detected horizontal meandering is frequently associated with temperature oscillations characterized by similar time scales (30 min) at all levels (2, 4.5 and 10 m). In contrast, dirty gravity waves superimposed on horizontal meandering are detected only at the highest level, characterized by time scales of a few minutes. The meandering produces an energy peak in the low-frequency spectral range, well fitted by a spectral model previously proposed for low wind speeds. The coexistence of horizontal and vertical oscillations is observed in the presence of large wind-direction shifts superimposed on the gradual flow meandering. Such shifts are often related to the variation of the mean flow dynamics, but also to intermittent events, localized in time, which do not produce a variation in the mean wind direction and that are associated with sharp decreases in wind speed and temperature. The noisy gravity waves coexisting with horizontal meandering persist only for a few cycles and produce bursts of turbulentmixing close to the ground, affecting the exchange processes between the surface and the stable boundary layer. The results confirm the importance of sharp wind-direction changes at lowwind speed in the stable atmosphere and suggest a possible correlation between observed gravity waves and dynamical instabilities modulated by horizontal meandering. |
author2 |
Cava, Daniela Mortarini, Luca Anfossi, Domenico Giostra, Umberto |
format |
Article in Journal/Newspaper |
author |
CAVA, DANIELA MORTARINI, LUCA Anfossi, Domenico Giostra, Umberto |
author_facet |
CAVA, DANIELA MORTARINI, LUCA Anfossi, Domenico Giostra, Umberto |
author_sort |
CAVA, DANIELA |
title |
Interaction of Submeso Motions in the Antarctic Stable Boundary Layer |
title_short |
Interaction of Submeso Motions in the Antarctic Stable Boundary Layer |
title_full |
Interaction of Submeso Motions in the Antarctic Stable Boundary Layer |
title_fullStr |
Interaction of Submeso Motions in the Antarctic Stable Boundary Layer |
title_full_unstemmed |
Interaction of Submeso Motions in the Antarctic Stable Boundary Layer |
title_sort |
interaction of submeso motions in the antarctic stable boundary layer |
publishDate |
2019 |
url |
http://hdl.handle.net/11576/2669502 https://doi.org/10.1007/s10546-019-00426-7 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000463665400001 volume:171 issue:2 firstpage:151 lastpage:173 numberofpages:23 journal:BOUNDARY-LAYER METEOROLOGY http://hdl.handle.net/11576/2669502 doi:10.1007/s10546-019-00426-7 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85060209659 |
op_doi |
https://doi.org/10.1007/s10546-019-00426-7 |
container_title |
Boundary-Layer Meteorology |
container_volume |
171 |
container_issue |
2 |
container_start_page |
151 |
op_container_end_page |
173 |
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1796300644820189184 |