نتایج جستجو برای: 500 hpa geopotential heights 500hpa hgt the explanatory variables for mean maximum temperature are vorticity at 500 hpa
تعداد نتایج: 18662522 فیلتر نتایج به سال:
Neural network models are used to reveal the nonlinear winter atmospheric teleconnection patterns associated with the El Niño-Southern Oscillation (ENSO) and with the Arctic Oscillation (AO) over the N. Hemisphere. The nonlinear teleconnections (for surface air temperature, precipitation, sea level pressure and 500 hPa geopotential height) are found to relate quadratically to the ENSO and AO in...
Today, dust and dust storms are among the most important environmental problems in the world and Iran, in particular. This study is conducted to identify synoptic patterns of the dust storms in Ardabil Province (Iran) and monitor the origin and pathway of its places. The study period is 34 years for1979 to 2013. The data used in this work are from synoptic stations of Ardabil province and the N...
North East of Iran sometime is influenced by heavy precipitation (HP) that causes plentiful damages. This paper aim to classifying and identifying the atmospheric circulation patterns related to heavy precipitation. This work increases my understanding from dynamic mechanisms that is generated by heavy precipitation. In this research, a heavy precipitation day has been considered if at least in...
The role of tropospheric vertical anomalies in rainfall solid Case study: the hazard of hail in Kermanshah Climate risks is one of the Types of hazards that damages human communities such as the phenomenon of hail, in the micro-scale, it causes financial losses and casualties. Hail is associated to the atmospheric elements and geo-location factors. Whenever weather conditions and appropriate p...
During heavy rain on 1–2 June 2015 in central China, the Wuhan mesosphere–stratosphere–troposphere (MST) radar was applied to record atmospheric responses with a 30 min period. According vertical gradient of echo power above 500 hPa, tropopause height could be determined by MST detection. The descent clearly observed few hours before rain, and then recovered usual heights during rain. observati...
abstract: about 60% of total premium of insurance industry is pertained?to life policies in the world; while the life insurance total premium in iran is less than 6% of total premium in insurance industry in 2008 (sigma, no 3/2009). among the reasons that discourage the life insurance industry is the problem of adverse selection. adverse selection theory describes a situation where the inf...
Estimation of probable maximum precipitation (PMP) is recognized as practical researches in which is taking into consideration by hydrologists in relation to designing the great structures of hydraulic in particular dams. In this study, synoptic method is used in order to estimate probable maximum precipitation in the Ajichai catchment. The meteorological data related from 40 synoptic and clima...
The main objective of the research was to determine synoptic and mesoscale conditions, which, under influence two Upper Cold Lows (UCL), favor occurrence locally intense rain in Cuba. From outputs Rapid Refresh (RAP) model, characteristics UCL with four cases associated them were analyzed. variables that studied are relative humidity, temperature, geopotential height, vertical speed, wind force...
introduction occurrence of heavy and rainstorm events is among the characteristics of arid and semi-arid regions all over the world and particularly in iran which is causing large floods and debris town. how ever, they can be used to supply and store water by controlling and exploiting the run off water floods. indexes of atmospheric instability are very useful scientific instruments to underst...
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