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Antarctic atmospheric Richardson number from radiosonde measurements and AMPS
oleh: Q. Yang, Q. Yang, Q. Yang, X. Wu, X. Wu, X. Wu, X. Hu, X. Hu, X. Hu, Z. Wang, Z. Wang, C. Qing, C. Qing, C. Qing, T. Luo, T. Luo, T. Luo, P. Wu, P. Wu, P. Wu, X. Qian, X. Qian, X. Qian, Y. Guo, Y. Guo, Y. Guo
| Format: | Article |
|---|---|
| Diterbitkan: | Copernicus Publications 2023-06-01 |
Deskripsi
<p>Monitoring a wide range of atmospheric turbulence over the Antarctic continent is still tricky, while the atmospheric Richardson number (<span class="inline-formula"><i>Ri</i></span>; a valuable parameter which determines the possibility that turbulence could be triggered) is easier to obtain. The Antarctic atmospheric <span class="inline-formula"><i>Ri</i></span>, 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 <span class="inline-formula"><i>Ri</i></span> can identify the main spatiotemporal characteristics of atmospheric turbulence over the Antarctic region. The correlation coefficients (<span class="inline-formula"><i>R</i><sub><i>x</i><i>y</i></sub></span>) of <span class="inline-formula">log <sub>10</sub>(<i>Ri</i>)</span> at McMurdo, the South Pole, and Dome C are 0.71, 0.59, and 0.53, respectively. The <span class="inline-formula"><i>Ri</i></span> was generally underestimated by the AMPS and the AMPS could better capture the trend of <span class="inline-formula">log <sub>10</sub>(<i>Ri</i>)</span> at relatively unstable atmospheric conditions. The seasonal median of <span class="inline-formula">log <sub>10</sub>(<i>Ri</i>)</span> 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 <span class="inline-formula"><i>Ri</i></span> 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 <span class="inline-formula">log <sub>10</sub>(<i>Ri</i>)</span> 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 (<span class="inline-formula"><i>R</i><sub><i>x</i><i>y</i></sub>>0.69</span>). Overall, our results suggest that the <span class="inline-formula"><i>Ri</i></span> estimated by AMPS are reasonable and the turbulence conditions in Antarctica are well revealed.</p>