Moisture Analysis on Precipitation Days During vitis vinifera Growth in Hamedan Province Vineyards
Journal Title: International Journal of Farming and Allied Sciences - Year 2013, Vol 2, Issue 2
Abstract
About 140 thousand tons of raisins are produced in Iran. Hamedan Province is one of the main areas of the country where produces grapes and raisins. Heavy rainfall events are one of the most climatic factors that impact on vitis vinifera during the phonology events. In this study, Moisture flux convergence was analyzed in heavy precipitation events in Hamedan Province. For this aim, daily precipitations of synoptic stations in this Province were used during March to October and from 1993 to 2008. Special humidity, Uwind and Vwind data are extracted from www.ncdc.noaa.gov site for 100 days in 500hpa, 600hpa, 700hpa, 850hpa, 925hpa and 1000hpa levels, at 00:00, 06:00, 12:00 and 18:00 times. MFC maps were computed by difference between advection function and convergence function. Frequency of MFC maps were calculated (MFC>4) at different levels and times. The humidity sources were traced for each heavy precipitation in different levels and times. The results show that there is the most frequency of MFC in 06:00 time from 850 to 1000 hpa and at 00:00 time from 500hpa to 700hpa. The results indicate that for 14% of cases, only one sea, for 21 % of cases, two seas, for 22 % of cases, three seas, for 38% of cases, four seas and for 5 % of cases, five seas contribute to prepare of humidity for heavy rainfall events in Haman province. The Mediterranean Sea and the Oman Sea in 850 hp to 1000 levels, and Mediterranean Sea and the Red Sea in the levels of 700 to 500 hpa are the most important supplier of humidity for heavy rainfall events in vineyards of Hamedan Province.
Authors and Affiliations
H. Nouri
Keywords
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