Wind variability in the northwestern part of the Black Sea from the offshore fixed platform observation data |
| |
| Authors: | A V Garmashov A B Polonskii |
| |
| Institution: | 1.Marine Hydrophysical Institute,National Academy of Sciences of Ukraine,Sevastopol,Ukraine |
| |
| Abstract: | The statistically ensured estimates of characteristics of temporal variability of wind speed and wind direction are obtained on the basis of observations carried out in 1996–2001 at the offshore fixed platform in the northwestern part of the Black Sea. The maximum values of monthly mean wind speed (more than 8 m/s) are registered in the cold half-year and the minimum ones (～4 m/s), in summer. The moderate winds of northern and southern directions dominate during the whole year. Using the Pearson’s chi-squared test, it is demonstrated that the wind speed follows the normal distribution law during the most part of observation period. The largest deviations from the normal law are timed to the periods of existence of intensive large-scale anomalies in the ocean-atmosphere system. A significant alternation of both synoptic and lower-frequency intramonthly wind speed fluctuations with typical periods of ～10–15 days is revealed. Their peak amplitude was registered in the fall and winter season of 1997/98, i.e., it was observed during the mature phase of one of the most intensive El Niños during the whole period of instrumental observations. At that time, the energy of intramonthly low-frequency wind speed fluctuations (～4 m2/s2) was equal to the energy of fluctuations within the synoptic range of the spectrum. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
