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آرشیو :
نسخه بهار 1397- جلد اول
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موضوع :
موضوعی تعریف نشده!
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نویسنده/گان :
محبوبه منتظر عطایی، مرضیه زینت بخش
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کلید واژه :
بارش سنگین، الگوهای سینوپتیکی، ناوه، جریان همرفتی، آذربایجان
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Title :
Synoptic Analysis of Heavy Rain Precipitation, April 15-14, 2017 Azarbaijan area
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Abstract :
Introduction:
The rainfall patterns of different geographic regions are the resultant and complex reactions of the Earth's atmosphere, which is of great importance among the events of the climate, given its vital role. The importance of severe and heavy rainfall that results in flood-currents can be used to control or reduce the destructive effects of the flood, especially in the mountainous area of Azerbaijan, and is always one of the factors causing financial and human damage to humans and the surrounding environment. The region of Azerbaijan is due to its topographical features and climatic conditions from the densely populated areas of the country, and the biological and developmental activities of the population living in these areas are tied to these climatic conditions. In this regard, the role of spring rainfall in Azerbaijan is of great importance in supplying surface water and underground water. Genetically, the type of precipitation and access sources of moisture also have different differences from the precipitation of other seasons.
materials and ways:
Synoptic method was used to study the synoptic pattern of heavy rainfall in the 14th and 15th of April, 2017 in Azarbaijan. Based on this, rainfall data was first extracted from rainwater meter stations of East and West Azarbaijan from the country's meteorological organization. In order to determine the synoptic pattern for the heavy rainfall day in the northwest region of Iran, re-analyzed data was prepared with 5 * 5 degree networking from the American National Center for Environmental Prediction (NCEP / NCAR). For the rainy day, the pressure and wind data at ground level and 500 hp, the special map for the 850 hPa scale, tidal maps were used to determine the type of air flow, its intensity. The wind component (U) and the wind turbine wind (V) for the 700 and 500 hectares, the velocity (Omega) for the surface of 700 hPa and the atmospheric levels and the long-wave output OLR data (12 and 18) To determine the convection and its intensity in the region of Azerbaijan. Flow chart maps were used to determine the convergence and divergence centers that represent the dominant flow pattern in the area. Grid Data Analysis and Presentation (GRADS) software was used in the preparation of research maps.
Results and discussion:
The combined map, ground pressure, and altitudes of 500 hPa for the 14th and 15th of April 2017 indicate that a low dynamic displacement of immigrants is due to the occurrence of heavy rainfall. The flow lines indicate the effect of the Mediterranean and the Red Sea for two days of study. This flow has been flowing along the trough axis in the west of the Red Sea and enhancing the high-pressure nuclear humidity located on the Arabian Peninsula towards the Azerbaijani region. The map of 500 hpa contributes to the establishment of the maximum Negative turning in the Arabian Peninsula and the maximum positive turning in the east of the Mediterranean Sea, which causes the flow of meters to the Azerbaijani to be compressed by introducing moisture into the low pressure system of the Red Sea, Significant and heavy rainfall has occurred in different parts of Azerbaijan and has led to flooding. Because of the strong and positive floating power, the region has instability and rainfall. The instability can be the injection of moisture from the Red Sea into the Mediterranean Sea and moving eastward to the Azerbaijani region. The temperature diagram shows the temperature drop of the atmosphere with increasing altitude. The data from the map guide shows the number below 200 in the west of Azerbaijan, indicating a strong local loop in the entire region of Azerbaijan.
Conclusion:
The results of the study showed that the reason of occurrence of flood events in the Azarbaijan region of 14 and 15 of April 2017 is the deposition of deep waves on the Red Sea, which was amplified by the movements of the Mediterranean and Eastern European flows on the Red Sea, which is a high pressure station In the Horn of Africa and other highlands in the Arabian Peninsula, it has caused the flow of moisture into the western currents and the movement of this stream to the northwest of Iran and the Azarbaijan area. Investigating the maps of the flow of moisture showed that the west flow path is on the geographic map of Iran in the west and southwest towards the west of the Caspian Sea, which shows the maximum pressure in the region of Azerbaijan. The region has upward flow and divergence and daily mapping maps indicate the establishment of convergence conditions in the rainy days in Azerbaijan. The analysis of atmospheric omega planar maps for study days showed that divergence in the earth's surface and intense convergence in the middle latitudes were formed and in the upper level of divergence, which indicates the dynamics of flow. The reason of the occurrence of severe rainfall on the 14th and 15th of April was divergence in the upper levels and intense convergence in the middle levels. The study of temperature diagrams, temperature anomaly maps and long wavelength radiation reflected the effect of local convection currents especially during the next hours. From afternoon it shows the convergence of the middle levels of the atmosphere and the strengthening of the Western air mass in the Azerbaijani region. In other words, due to the flood events of 14 and 15 April 2017 in the Azerbaijani region, the influence of the combined mass of the Mediterranean Sea and the Red Sea and the high water level of the highlands of North Africa and the Arabian Peninsula and the Black Sea waves, which compromises the flow in the Azerbaijani region, and the strengthening of local convolutional processes The effects of radiation on the long-wave wavelength of the earth and the formation of convective currents in the afternoon and the strengthening of convergence in the middle levels can be counted.
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