Statistical dynamics of equatorial waves in tropical radiosonde wind data
Koh, Tieh Yong
Djamil, Y. S.
Teo, Chee Kiat
Date of Issue2010
Weibull distributions were fitted to wind speed data from radiosonde stations in the global tropics. A statistical theory of equatorial waves was proposed to explain the shape parameter k obtained over Malay Peninsula and the wider Equatorial Monsoon Zone. The theory uses the (−5/3)-power law in quasi-2-D turbulence, classical Boltzmann statistics and the Central Limit Theorem. It provides a statistical dynamical basis for using empirical Weibull fits to derive wind speed thresholds for monitoring data quality. The regionally adapted thresholds retain more useful data than conventional ones defined from taking the regional mean plus three standard deviations. The new approach is shown to eliminate reports of atypically strong wind over Malay Peninsula which may have escaped detection in quality control of global datasets as the latter has assumed a larger spread of wind speed.
DRNTU::Science::Geology::Volcanoes and earthquakes
Atmospheric chemistry and physics discussions
© 2010 Author(s). This paper was published in Atmospheric Chemistry and Physics Discussions and is made available as an electronic reprint (preprint) with permission of European Geosciences Union. The paper can be found at the following official URL: [http://dx.doi.org/10.5194/acpd-10-16345-2010]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.