Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana
We present lidar observations of the middle atmosphere at the South Pole (90$\sp\circ$S), Syowa (69$\sp\circ$S, 39$\sp\circ$E), and Urbana (88$\sp\circ$W, 40$\sp\circ$N). The South Pole stratospheric observations yield a high resolution data set of stratospheric temperature and polar stratospheric c...
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ftunivillidea:oai:www.ideals.illinois.edu:2142/22309 2024-10-20T14:04:59+00:00 Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana Collins, Richard Laurence Gardner, Chester S. 1994 http://hdl.handle.net/2142/22309 eng eng AAI9416352 (UMI)AAI9416352 http://hdl.handle.net/2142/22309 Copyright 1994 Collins, Richard Laurence Geophysics Engineering Electronics and Electrical Physics Atmospheric Science text 1994 ftunivillidea 2024-10-01T12:57:43Z We present lidar observations of the middle atmosphere at the South Pole (90$\sp\circ$S), Syowa (69$\sp\circ$S, 39$\sp\circ$E), and Urbana (88$\sp\circ$W, 40$\sp\circ$N). The South Pole stratospheric observations yield a high resolution data set of stratospheric temperature and polar stratospheric cloud (PSC) backscatter ratio profiles during the austral winter and spring of 1990. The observations show that the seasonal development of the clouds is primarily determined by the behavior of the temperature field. The PSCs are composed predominantly of nitric acid trihydrate particles. Correlation with frost-point measurements shows that nitric acid mixing ratios are depressed in the spring. The small-scale structure of the clouds appears to be controlled by gravity waves propagating upward through the clouds. Lidar measurements of the mesospheric Na layer at the South Pole in 1990 and Syowa in 1985 are used to characterize mesopause region gravity wave activity over Antarctica. The structure of the Na layer reflects the general circulation of the high-latitude mesopause. The monochromatic waves observed over Antarctica show the same general characteristics as those reported from other sites. The mean density variance of the gravity wave perturbations at the South Pole is similar to that observed at a variety of lower latitude sites. A distinct feature of the South Pole observations is the presence of strong coherent oscillations in the bottomside density contours of the Na layer close to the inertial frequency. Na Doppler/temperature lidar measurements of Na density and temperature at Urbana yield a high resolution seasonal data set of gravity wave activity. The direct measurement of the Brunt-Vaisala period allows accurate calculation of the horizontal velocity and vertical displacement from the density measurements. The horizontal velocity and vertical displacement m-spectrum magnitudes and indices show considerable seasonal and nightly variability, behaviors which contradict the predictions of Linear Instability ... Text Antarc* Antarctica South pole South pole University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship) Austral South Pole |
institution |
Open Polar |
collection |
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship) |
op_collection_id |
ftunivillidea |
language |
English |
topic |
Geophysics Engineering Electronics and Electrical Physics Atmospheric Science |
spellingShingle |
Geophysics Engineering Electronics and Electrical Physics Atmospheric Science Collins, Richard Laurence Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana |
topic_facet |
Geophysics Engineering Electronics and Electrical Physics Atmospheric Science |
description |
We present lidar observations of the middle atmosphere at the South Pole (90$\sp\circ$S), Syowa (69$\sp\circ$S, 39$\sp\circ$E), and Urbana (88$\sp\circ$W, 40$\sp\circ$N). The South Pole stratospheric observations yield a high resolution data set of stratospheric temperature and polar stratospheric cloud (PSC) backscatter ratio profiles during the austral winter and spring of 1990. The observations show that the seasonal development of the clouds is primarily determined by the behavior of the temperature field. The PSCs are composed predominantly of nitric acid trihydrate particles. Correlation with frost-point measurements shows that nitric acid mixing ratios are depressed in the spring. The small-scale structure of the clouds appears to be controlled by gravity waves propagating upward through the clouds. Lidar measurements of the mesospheric Na layer at the South Pole in 1990 and Syowa in 1985 are used to characterize mesopause region gravity wave activity over Antarctica. The structure of the Na layer reflects the general circulation of the high-latitude mesopause. The monochromatic waves observed over Antarctica show the same general characteristics as those reported from other sites. The mean density variance of the gravity wave perturbations at the South Pole is similar to that observed at a variety of lower latitude sites. A distinct feature of the South Pole observations is the presence of strong coherent oscillations in the bottomside density contours of the Na layer close to the inertial frequency. Na Doppler/temperature lidar measurements of Na density and temperature at Urbana yield a high resolution seasonal data set of gravity wave activity. The direct measurement of the Brunt-Vaisala period allows accurate calculation of the horizontal velocity and vertical displacement from the density measurements. The horizontal velocity and vertical displacement m-spectrum magnitudes and indices show considerable seasonal and nightly variability, behaviors which contradict the predictions of Linear Instability ... |
author2 |
Gardner, Chester S. |
format |
Text |
author |
Collins, Richard Laurence |
author_facet |
Collins, Richard Laurence |
author_sort |
Collins, Richard Laurence |
title |
Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana |
title_short |
Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana |
title_full |
Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana |
title_fullStr |
Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana |
title_full_unstemmed |
Middle atmosphere structure and dynamics: Lidar studies at the South Pole, Syowa and Urbana |
title_sort |
middle atmosphere structure and dynamics: lidar studies at the south pole, syowa and urbana |
publishDate |
1994 |
url |
http://hdl.handle.net/2142/22309 |
geographic |
Austral South Pole |
geographic_facet |
Austral South Pole |
genre |
Antarc* Antarctica South pole South pole |
genre_facet |
Antarc* Antarctica South pole South pole |
op_relation |
AAI9416352 (UMI)AAI9416352 http://hdl.handle.net/2142/22309 |
op_rights |
Copyright 1994 Collins, Richard Laurence |
_version_ |
1813442542423769088 |