Abstract
Radiosonde data, which includes surface wind speed (SWS), temperature, and wind profiles used in this study are data at Soekarno-Hatta airport (Cengkareng) in Jakarta. The data period is January to June 2020 used to evaluate the shear of wind direction, shear of wind speed, and Richardson number as the atmospheric parameters that are significantly noticed in flight. In aviation, the Richardson number is used as a rough measure of air turbulence, which values below unity indicating significant turbulence. The surface wind speed can be evaluated directly from the observation data. In contrast, the shears of wind direction and wind speed are determined by calculating the differences in every meter in a vertical direction (from the surface to 10 km). The result shows that the minimum and maximum wind speeds are 0 and 20 ms−1, respectively. During this period, there was an event where the surface wind speed exceeded the threshold value of safe surface wind speed for flight (15 ms−1). Moreover, both the shears of wind speed and wind direction are far below the threshold value. Based on the analysis of turbulence using the Richardson number, the percentage of turbulence events is about 53%. This situation occurs under stable conditions characterized by the CAPE < 1000 J kg−1 (no-convective activity) and unstable conditions (CAPE > 1000 J kg−1). Furthermore, there was no significant difference in results related to Southern Oscillation Index (SOI) phase difference and Madden–Julian Oscillation (MJO) amplitude difference. The correlation test shows that there is no correlation between SOI and MJO amplitude to the aviation parameters.
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Thank LAPAN for funding this research and appreciation to the research group for valuable suggestions and comments.
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Juaeni, I., Saufina, E., Pratama, R., Fatria, D., Harjupa, W., Fathrio, I. (2022). Evaluation of the Surface Wind Speed, Shear of Wind Speed, Shear of Wind Direction and Richardson Number at Soekarno-Hatta Airport Using Wyoming Radiosonde Data. In: Yulihastin, E., Abadi, P., Sitompul, P., Harjupa, W. (eds) Proceedings of the International Conference on Radioscience, Equatorial Atmospheric Science and Environment and Humanosphere Science, 2021. Springer Proceedings in Physics, vol 275. Springer, Singapore. https://doi.org/10.1007/978-981-19-0308-3_29
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