Peculiarities of Multiscale Wind Regime Variability at Coastal Water Area of the North-Eastern Black Sea

Abstract

Peculiarities of variability of wind regime in the period from 1935 to 2014 are discussed. More detailed analysis of variability of meteorological condition on different scales during the last years (2010−2014) is conducted. Progressive vector diagrams are used for visualization of time series of wind vectors. Changes of prevalent winds from NE to S-E-SE (warm period waves) are reflected on a climatic progressive vector diagram from 1935 to 2014. Maximum wave amplitude on a diagram was registered in a period of 2004– 2006. In 2007–2014, a distinctive feature of the wind regime was a dominance of SE winds during warm and abnormally warm years. Major types of atmospheric processes that give rise to dominating winds are outlined. It is demonstrated that differences of the wind regime during particular years with various temperature characteristics of years and winters are caused by a variability of atmospheric synoptic processes on different scales. Using annual wind diagrams and pictures of temporal wind variability, as well as air and water monthly temperature (observation time every 3 hours), periods of prolonged wind forcing (during several months and during 1−2 decades of every month) are distinguished. Role of the winds of SE bearings with high repeatability during several months in forming of the vertical water structure of coastal zone is demonstrated. Analysis of the results of the experimental data acquired in 2010–2014 (research vessel “Ashamba”) has shown that during stable winds of SE bearings advection of cold intermediate waters from the area of their formation (central divergence zone) to the coastal zone becomes stronger.