Antarctic atmospheric Richardson number from radiosonde measurements and AMPS
Monitoring a wide range of atmospheric turbulence over the Antarctic continent is still tricky, while the atmospheric Richardson number ( Ri a valuable parameter which determines the possibility that turbulence could be triggered) is easier to obtain. The Antarctic atmospheric Ri , calculated from t...
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ftcopernicus:oai:publications.copernicus.org:acp103317 2023-07-02T03:30:32+02:00 Antarctic atmospheric Richardson number from radiosonde measurements and AMPS Yang, Qike Wu, Xiaoqing Hu, Xiaodan Wang, Zhiyuan Qing, Chun Luo, Tao Wu, Pengfei Qian, Xianmei Guo, Yiming 2023-06-09 application/pdf https://doi.org/10.5194/acp-23-6339-2023 https://acp.copernicus.org/articles/23/6339/2023/ eng eng doi:10.5194/acp-23-6339-2023 https://acp.copernicus.org/articles/23/6339/2023/ eISSN: 1680-7324 Text 2023 ftcopernicus https://doi.org/10.5194/acp-23-6339-2023 2023-06-12T16:24:16Z Monitoring a wide range of atmospheric turbulence over the Antarctic continent is still tricky, while the atmospheric Richardson number ( Ri a valuable parameter which determines the possibility that turbulence could be triggered) is easier to obtain. The Antarctic atmospheric Ri , calculated from the potential temperature and wind speed, was investigated using the daily results from the radiosoundings and forecasts of the Antarctic Mesoscale Prediction System (AMPS). Radiosoundings for a year at three sites (McMurdo – MM, South Pole – SP, and Dome C – DC) were used to quantify the reliability of the AMPS forecasts. The AMPS-forecasted Ri can identify the main spatiotemporal characteristics of atmospheric turbulence over the Antarctic region. The correlation coefficients ( R x y ) of log 10 ( Ri ) at McMurdo, the South Pole, and Dome C are 0.71, 0.59, and 0.53, respectively. The Ri was generally underestimated by the AMPS and the AMPS could better capture the trend of log 10 ( Ri ) at relatively unstable atmospheric conditions. The seasonal median of log 10 ( Ri ) along two vertical cross-sections of the AMPS forecasts are presented, and it shows some zones where atmospheric turbulence can be highly triggered in Antarctica. The Ri distributions appear to be reasonably correlated to some large-scale phenomena or local-scale dynamics (katabatic winds, polar vortices, convection, gravity wave, etc.) over the Antarctic plateau and surrounding ocean. Finally, the log 10 ( Ri ) at the planetary boundary layer height (PBLH) were calculated and their median value is 0.316. This median value, in turn, was used to estimate the PBLH and agrees well with the AMPS-forecasted PBLH ( R x y >0.69 ). Overall, our results suggest that the Ri estimated by AMPS are reasonable and the turbulence conditions in Antarctica are well revealed. Text Antarc* Antarctic Antarctica South pole South pole Copernicus Publications: E-Journals Antarctic South Pole The Antarctic Atmospheric Chemistry and Physics 23 11 6339 6355 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Monitoring a wide range of atmospheric turbulence over the Antarctic continent is still tricky, while the atmospheric Richardson number ( Ri a valuable parameter which determines the possibility that turbulence could be triggered) is easier to obtain. The Antarctic atmospheric Ri , calculated from the potential temperature and wind speed, was investigated using the daily results from the radiosoundings and forecasts of the Antarctic Mesoscale Prediction System (AMPS). Radiosoundings for a year at three sites (McMurdo – MM, South Pole – SP, and Dome C – DC) were used to quantify the reliability of the AMPS forecasts. The AMPS-forecasted Ri can identify the main spatiotemporal characteristics of atmospheric turbulence over the Antarctic region. The correlation coefficients ( R x y ) of log 10 ( Ri ) at McMurdo, the South Pole, and Dome C are 0.71, 0.59, and 0.53, respectively. The Ri was generally underestimated by the AMPS and the AMPS could better capture the trend of log 10 ( Ri ) at relatively unstable atmospheric conditions. The seasonal median of log 10 ( Ri ) along two vertical cross-sections of the AMPS forecasts are presented, and it shows some zones where atmospheric turbulence can be highly triggered in Antarctica. The Ri distributions appear to be reasonably correlated to some large-scale phenomena or local-scale dynamics (katabatic winds, polar vortices, convection, gravity wave, etc.) over the Antarctic plateau and surrounding ocean. Finally, the log 10 ( Ri ) at the planetary boundary layer height (PBLH) were calculated and their median value is 0.316. This median value, in turn, was used to estimate the PBLH and agrees well with the AMPS-forecasted PBLH ( R x y >0.69 ). Overall, our results suggest that the Ri estimated by AMPS are reasonable and the turbulence conditions in Antarctica are well revealed. |
format |
Text |
author |
Yang, Qike Wu, Xiaoqing Hu, Xiaodan Wang, Zhiyuan Qing, Chun Luo, Tao Wu, Pengfei Qian, Xianmei Guo, Yiming |
spellingShingle |
Yang, Qike Wu, Xiaoqing Hu, Xiaodan Wang, Zhiyuan Qing, Chun Luo, Tao Wu, Pengfei Qian, Xianmei Guo, Yiming Antarctic atmospheric Richardson number from radiosonde measurements and AMPS |
author_facet |
Yang, Qike Wu, Xiaoqing Hu, Xiaodan Wang, Zhiyuan Qing, Chun Luo, Tao Wu, Pengfei Qian, Xianmei Guo, Yiming |
author_sort |
Yang, Qike |
title |
Antarctic atmospheric Richardson number from radiosonde measurements and AMPS |
title_short |
Antarctic atmospheric Richardson number from radiosonde measurements and AMPS |
title_full |
Antarctic atmospheric Richardson number from radiosonde measurements and AMPS |
title_fullStr |
Antarctic atmospheric Richardson number from radiosonde measurements and AMPS |
title_full_unstemmed |
Antarctic atmospheric Richardson number from radiosonde measurements and AMPS |
title_sort |
antarctic atmospheric richardson number from radiosonde measurements and amps |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-6339-2023 https://acp.copernicus.org/articles/23/6339/2023/ |
geographic |
Antarctic South Pole The Antarctic |
geographic_facet |
Antarctic South Pole The Antarctic |
genre |
Antarc* Antarctic Antarctica South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica South pole South pole |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-23-6339-2023 https://acp.copernicus.org/articles/23/6339/2023/ |
op_doi |
https://doi.org/10.5194/acp-23-6339-2023 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
23 |
container_issue |
11 |
container_start_page |
6339 |
op_container_end_page |
6355 |
_version_ |
1770274723421224960 |