Stratospheric gravity wave fluxes and scales during DEEPWAVE
During the Deep Propagating Gravity Wave Experiment (DEEPWAVE) project in June and July 2014, the Gulfstream V research aircraft flew 97 legs over the Southern Alps of New Zealand and 150 legs over the Tasman Sea and Southern Ocean, mostly in the low stratosphere at 12.1-km altitude. Improved instru...
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ftncar:oai:drupal-site.org:articles_18590 2023-09-05T13:23:30+02:00 Stratospheric gravity wave fluxes and scales during DEEPWAVE Smith, Ronald (author) Nugent, Alison (author) Kruse, Christopher (author) Fritts, David (author) Doyle, James (author) Eckermann, Steven (author) Taylor, Michael (author) Dörnbrack, Andreas (author) Uddstrom, M. (author) Cooper, William (author) Romashkin, Pavel (author) Jensen, Jorgen (author) Beaton, Stuart (author) 2016-07-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-023-048 https://doi.org/10.1175/JAS-D-15-0324.1 en eng American Meteorological Society Journal of the Atmospheric Sciences articles:18590 ark:/85065/d7416zpj http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-023-048 doi:10.1175/JAS-D-15-0324.1 Copyright 2016 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. Text article 2016 ftncar https://doi.org/10.1175/JAS-D-15-0324.1 2023-08-14T18:43:20Z During the Deep Propagating Gravity Wave Experiment (DEEPWAVE) project in June and July 2014, the Gulfstream V research aircraft flew 97 legs over the Southern Alps of New Zealand and 150 legs over the Tasman Sea and Southern Ocean, mostly in the low stratosphere at 12.1-km altitude. Improved instrument calibration, redundant sensors, longer flight legs, energy flux estimation, and scale analysis revealed several new gravity wave properties. Over the sea, flight-level wave fluxes mostly fell below the detection threshold. Over terrain, disturbances had characteristic mountain wave attributes of positive vertical energy flux (EFz), negative zonal momentum flux, and upwind horizontal energy flux. In some cases, the fluxes changed rapidly within an 8-h flight, even though environmental conditions were nearly unchanged. The largest observed zonal momentum and vertical energy fluxes were MFx = -550 mPa and EFz = 22 W m⁻², respectively. A wide variety of disturbance scales were found at flight level over New Zealand. The vertical wind variance at flight level was dominated by short "fluxless" waves with wavelengths in the 6-15-km range. Even shorter scales, down to 500 m, were found in wave breaking regions. The wavelength of the flux-carrying mountain waves was much longer-mostly between 60 and 150 km. In the strong cases, however, with EFz > 4 W m⁻², the dominant flux wavelength decreased (i.e., "downshifted") to an intermediate wavelength between 20 and 60 km. A potential explanation for the rapid flux changes and the scale "downshifting" is that low-level flow can shift between "terrain following" and "envelope following" associated with trapped air in steep New Zealand valleys. Article in Journal/Newspaper Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) New Zealand Southern Ocean Journal of the Atmospheric Sciences 73 7 2851 2869 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
During the Deep Propagating Gravity Wave Experiment (DEEPWAVE) project in June and July 2014, the Gulfstream V research aircraft flew 97 legs over the Southern Alps of New Zealand and 150 legs over the Tasman Sea and Southern Ocean, mostly in the low stratosphere at 12.1-km altitude. Improved instrument calibration, redundant sensors, longer flight legs, energy flux estimation, and scale analysis revealed several new gravity wave properties. Over the sea, flight-level wave fluxes mostly fell below the detection threshold. Over terrain, disturbances had characteristic mountain wave attributes of positive vertical energy flux (EFz), negative zonal momentum flux, and upwind horizontal energy flux. In some cases, the fluxes changed rapidly within an 8-h flight, even though environmental conditions were nearly unchanged. The largest observed zonal momentum and vertical energy fluxes were MFx = -550 mPa and EFz = 22 W m⁻², respectively. A wide variety of disturbance scales were found at flight level over New Zealand. The vertical wind variance at flight level was dominated by short "fluxless" waves with wavelengths in the 6-15-km range. Even shorter scales, down to 500 m, were found in wave breaking regions. The wavelength of the flux-carrying mountain waves was much longer-mostly between 60 and 150 km. In the strong cases, however, with EFz > 4 W m⁻², the dominant flux wavelength decreased (i.e., "downshifted") to an intermediate wavelength between 20 and 60 km. A potential explanation for the rapid flux changes and the scale "downshifting" is that low-level flow can shift between "terrain following" and "envelope following" associated with trapped air in steep New Zealand valleys. |
author2 |
Smith, Ronald (author) Nugent, Alison (author) Kruse, Christopher (author) Fritts, David (author) Doyle, James (author) Eckermann, Steven (author) Taylor, Michael (author) Dörnbrack, Andreas (author) Uddstrom, M. (author) Cooper, William (author) Romashkin, Pavel (author) Jensen, Jorgen (author) Beaton, Stuart (author) |
format |
Article in Journal/Newspaper |
title |
Stratospheric gravity wave fluxes and scales during DEEPWAVE |
spellingShingle |
Stratospheric gravity wave fluxes and scales during DEEPWAVE |
title_short |
Stratospheric gravity wave fluxes and scales during DEEPWAVE |
title_full |
Stratospheric gravity wave fluxes and scales during DEEPWAVE |
title_fullStr |
Stratospheric gravity wave fluxes and scales during DEEPWAVE |
title_full_unstemmed |
Stratospheric gravity wave fluxes and scales during DEEPWAVE |
title_sort |
stratospheric gravity wave fluxes and scales during deepwave |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-023-048 https://doi.org/10.1175/JAS-D-15-0324.1 |
geographic |
New Zealand Southern Ocean |
geographic_facet |
New Zealand Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Journal of the Atmospheric Sciences articles:18590 ark:/85065/d7416zpj http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-023-048 doi:10.1175/JAS-D-15-0324.1 |
op_rights |
Copyright 2016 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JAS-D-15-0324.1 |
container_title |
Journal of the Atmospheric Sciences |
container_volume |
73 |
container_issue |
7 |
container_start_page |
2851 |
op_container_end_page |
2869 |
_version_ |
1776204102303219712 |