| Autor: |
Liu, D., Wang, Y., Wu, Y., Gross, B., Moshary, F., Gong, Shaohua, Yang, Guotao, Wang, Jihong, Xun, Yuchang, Wu, Foju, Li, Qinzeng, Liu, Xiao, Chen, Chunxia, Tian, Dawei |
| Předmět: |
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| Zdroj: |
EPJ Web of Conferences; 7/7/2020, Vol. 237, p1-4, 4p |
| Abstrakt: |
We report on the first observation of mesospheric cloud (MC) at the altitude range of 50-65 km with lidars at Yanqing (40.5°N, 116°E) and Pingquan (41°N, 118.7°E) on 30 October 2018. The MC occurred at the 51-56 km altitude range during the hours of dawn. It had an obvious double-layer structure, but the cloud layer was sparse. The MC was re-observed at the 56-62 km altitude range in the twilight, and the double-layer structure was still obvious. However, the cloud layer became thicker with a maximum volume backscatter coefficient (BSC) 3.1×10−10m−1sr−1. Atmospheric temperature structure was derived according to the lidar observations, and it was found that, several hours before the MC occurrence, a temperature anomaly with coldest temperature ~185 K was propagating downward at the altitudes of 50-65 km. This MC layer was simultaneously observed with lidar at Pingquan in the twilight. It could be a regional MC event and possibly formed locally by a transient cooling due to small-scale disturbances in the mesosphere. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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