ZONES OF INTENSIVE INTERACTIONS OVER THE NORTH ATLANTIC: 850 MB GEOPOTENTIAL HEIGHT, NOVEMBER
Journal Title: Вісник Одеського національного університету. Географічні та геологічні науки - Year 2017, Vol 22, Issue 2
Abstract
Problem Statement and Purpose. Formation of hydrometeorological characteristics at 850 hPa level is governed with the processes of interaction of the underlying surface with the surface layer of air and, at the same time, processes in the middle troposphere. Such processes assume the presence of inhomogeneities in the distribution of state vectors of various hydrometeorological characteristics over the North Atlantic basin and the adjoining land area. Clusterization of the air condition parameters at 850 hPa level, the calculation of the statistical characteristics of the proper homogeneous zones is the goal of this work and, at the same time, part of a more general study related to the determination of regions of intense interaction between the processes that form the hydrometeorological characteristics of the atmosphere and the ocean over the North Atlantic, as analogues of energy-active zones. Data & Methods. As a research object for investigation we used the fields of mean monthly air temperature, mass fraction of water vapor, geopotentials, velocity (relative), zonal component of wind, given at nodes of the regular grid of points 2.5º×2.5º over the North Atlantic from 1957 to 2001. For revealing zones of active interaction in the atmosphere over the North Atlantic and determining regions, which make a significant impact on formation of features of climatic conditions of response in the regions of Eastern Europe, methods of cluster and component analysis are applied to influencing factors being circulation characteristics and characteristics of heat and moisture exchange on the 850 mb geopotential height before including them in the model. In each node of a degree grid of 2,5º× 2,5º over the North Atlantic, the first three main components are identified, which describe more than 80% of the total dispersion of the processes of interaction in the air layer on the surface 850 mb geopotential height. Results. In the fields of the main components of the state vectors of meteorological characteristics over the North Atlantic, using the Universal iterative method of data clustering, homogeneous regions are defined. A physical and statistical analysis of the obtained clustering schemes is given, which has a good scientific justification. It is shown that the clusters of the first main component are of a scale-scale type, and the second and third components are of a focal character. Clusters are characterized by the intensity of the processes of interactions in the air layer on the surface 850 mb geopotential height. The intensity of the processes is characterized by the distribution and values of the weight, the mean values of the representative vectors and the intracluster dispersion. It is determined that the first main component makes the main contribution to the formation of the most of the initial meteorological values, and the third main component reflects the influence of local features on the interaction processes..
Authors and Affiliations
E. N. Serga
Keywords
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