التفاصيل البيبلوغرافية
| العنوان: |
The diurnal cycle of lower boundary-layer wind in the West African monsoon |
| المؤلفون: |
Thierry Lebel, Norbert Kalthoff, Kassimou Abdou, Douglas J. Parker, Barbara Brooks |
| المصدر: |
Quarterly Journal of the Royal Meteorological Society. 136:66-76 |
| بيانات النشر: |
Wiley, 2009. |
| سنة النشر: |
2009 |
| مصطلحات موضوعية: |
Atmospheric Science, 010504 meteorology & atmospheric sciences, 0207 environmental engineering, Mesoscale meteorology, SODAR, Magnitude (mathematics), 02 engineering and technology, Atmospheric sciences, Monsoon, 01 natural sciences, Boundary layer, Altitude, 13. Climate action, Diurnal cycle, Climatology, Wind shear, Environmental science, 020701 environmental engineering, 0105 earth and related environmental sciences |
| الوصف: |
Measurements of lower boundary-layer winds collected from four Sonic Detection And Ranging (SODAR) systems during the African Monsoon Multidisciplinary Analysis (AMMA) are presented. The SODARs were located in a mesoscale network in the vicinity of Niamey, Niger, in the period 31 May to 17 August 2006; from this network 41 days of good measurements have been obtained from at least one of the SODARs, while there are several days in which two or more SODARs produced good simultaneous data. The average variation of the winds in the lower boundary layer is here presented, as a function of height and of time of day. The results confirm previous studies of the diurnal cycle of winds, and quantify the variation of this diurnal cycle with height at low altitudes. On many nights, a distinct nocturnal low-level jet was observed, at 200–400 m altitude. In profiles averaged over all of the sample days, the peak wind shear was in the layer below 300 m, with the strongest wind shear from 0000 to 0600 UTC. In particular, the magnitude of low-level wind shear, which is a significant hazard for aviation, is shown to be strongly dependent on time of day. Strong low-level wind shear (more than 4 m s−1 per 100 m), was observed on more than 35% of days in the 0000–0300 UTC period. Copyright © 2009 Royal Meteorological Society |
| تدمد: |
0035-9009 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_________::671e359ebaaa4c7cfe0305b8d2ebef81
https://doi.org/10.1002/qj.536 |
| حقوق: |
CLOSED |
| رقم الأكسشن: |
edsair.doi...........671e359ebaaa4c7cfe0305b8d2ebef81 |
| قاعدة البيانات: |
OpenAIRE |
