Climatology
naser pouyanfar; Gholam Ali Mozafari; Kamal Omidvar; Ahmad Mazidi
Abstract
IntroductionPistachio, like many subtropical fruit trees, need a cold period in their annual cycle to allow the buds to bloom naturally after the right conditions are in place. There are several models to calculate the chilling needs of pistachio, of which the chilling hours model, Utah and Utah positive ...
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IntroductionPistachio, like many subtropical fruit trees, need a cold period in their annual cycle to allow the buds to bloom naturally after the right conditions are in place. There are several models to calculate the chilling needs of pistachio, of which the chilling hours model, Utah and Utah positive are the most important of these models. The studied geographical area is Yazd-Ardakan plain located in Yazd province.Materials and methodsIn this study, according to statistical tests based on meteorological variables, the chilling hours model was selected for modeling. To conduct this research, three-hour temperature data of Yazd Synoptic Station during the statistical period of 1367-1396 were used to model and estimate the total monthly chilling hours of pistachio and The daily temperature data of this station during the statistical period of 1961-2005 were used for the SDSM model and the monthly temperature statistics of the years 1385-1397 were used to evaluate the downscaling data of the CanESM2 model under different RCP scenarios and finally modeling for the years 1400 -1429 was done.Result and discussionResults indicate that there is a significant correlation between monthly cumulative hours of temperatures between zero and 7.2 ° C and monthly temperature parameters such as mean minimum temperature, mean maximum temperature and mean monthly temperature, which in the absence of data hourly temperature can be used to model and determine monthly cumulative hours.ConclusionFindings show that the chilling needs of Kalle-Ghuchi, Owhadi and Ahmad- Aghaei species will be met in the coming years and Akbari and Fandoghi species will not be met.
Kamal Omidvar; Mehdi Mahmodabadi; Farshad Safarpour
Volume 19, Issue 51 , April 2015, , Pages 21-39
Abstract
Abstract In this research we investigated synoptic pattern of heavy rain 1 and 2 February 2011 in southern and central regions of Iran specially Kerman province. At the first we calculated heavy rain for all of synoptic stations with use Extreme value type1 then thermodynamic characteristics of heavy ...
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Abstract In this research we investigated synoptic pattern of heavy rain 1 and 2 February 2011 in southern and central regions of Iran specially Kerman province. At the first we calculated heavy rain for all of synoptic stations with use Extreme value type1 then thermodynamic characteristics of heavy rain analyzed with use radio sounding and Skew-t data. For analyzing of this phenomenon we used daily rainfall data 32 synoptic stations of southern and central regions and SLP and 850, 500 and 300 hgt maps. In the 5 day periods, we investigated synoptic pattern formation and its trend in weather maps. The results show that main factor of precipitation in region is formation of cut off low on Mediterranean sea. This system act so blocking and with move onto east, it causes that trough of east Mediterranean reinforcement thus west systems penetrate to lower latitude and they get high level of humidity from south seas and they makes sever precipitations in the study area.
