The Relationship Between Upper Level Temperature and Geopotential Heights over Baghdad City by Using Seasonal Ensembles

Abstract

Geopotential height is one of meteorological variable that widely used to understand the atmosphere by focuses on wind motion in atmosphere and on its General Circulation Motion (GCM) yield on its valences. The temperature is an indication for heat energy variance because it feeds the wind system and it widely insist on air system and Geopotential height. The methodology proposed and adopted in this work is based on the seasonal ensemble model from (European Centre for Medium Range Weather Forecasting) (ECMWF). the data were obtain for 10 years from 1989 to 1990 and for 500 hpa and 700 hpa layers to show the coherence between these two layers for variables (Temperature - Geopotential height) over Baghdad city and over all region and for winter and summer, the data value taken in statistical way, as Analyses the geopotential height and temperature the result shows that there is a high effect on geopotential height pattern from the variation of temperature value on summer and winter. the statistical way show that the geopotential height value vary in harmony with temperature value for both seasons and for both study layers , for example the geopotential height value belongs on 500 hpa in 1985 year to 55200 (m/s)2 on winter where the temperature is -17.5 0 c and it increase in summer by increasing temperature on the same level belonging to 57850 (m/s)2 when the temperature is -5.7 0 c , and we found that there is a same behavior on 700 hpa level for all study years, but in general the relation is high between temperature and geopotential height and become bigger in winter as compared with summer seasons .