بررسي روند پارامترهاي اقليمي در 35 ايستگاه سينو پتيك ايران

چكيده انگليسي :

316AbstractAlthough all the reasons of climate changes or no changes are unknown discussing aboutclimate changes has always been the center of researchers attention The objective of thisresearch is trend analysis of temperature and rainfall parameters in 35 synoptic stations ofIran In this study time series of rainfall consist of Number of rainy days number of rainydays with equal to or greater than 1 mm number of rainy days with equal to or greater than10 mm greater daily of precipitation monthly and yearly rainfall and time series oftemperature consist of Average of maximum temperature average of minimumtemperature absolute maximum temperature and absolute minimum temperature Inaddition relative humidity in 3 9 and 15 utc and fastest wind speed per annum andmonthly for 35 synoptic stations were analyzed to assess climate variability in Iran In thisstudy for determination of trend the parametric and non parametric tests were used Mann Kendall Mann Whitney non parametric and t test parametric The results of monthlyrainfall trends by Mann Kendall test showed that most of synoptic stations have nosignificant trends in spring summer autumn and winter Analyzing the annual rainfalltrends also showed that there are no significant trends in more than 80 of synopticstations Analyzing the number of rainy days by Mann Kendall test showed that most ofthe areas in Iran have no significant trends in March but nearly half of Iran has significantnegative trends in April Almost all of the synoptic stations have no significant trends insummer autumn and winter About 63 of synoptic stations have increasing trends in thenumber of rainy days yearly Significant trends in time series of number of rainy days andnumber of rainy days with equal to or greater than 1 mm mostly occur during spring andthen in summer But number of days with equal to or greater than 10 mm occurs mostlyduring these 3 seasons summer spring and winter The greater daily of precipitationmostly occurs during summer Results of studying average maximum temperatureparameter in monthly scale showed an increasing significant trend in most of west southwest and east stations of Iran for spring summer and autumn Also most of Iran showsincreasing trend for annual average maximum temperature Analyzing average minimumtemperature in month scale showed 90 of synoptic stations have significant trend and thisvariable is increasing in the whole year for most parts of Iran Analyzing annual averageminimum temperature also shows 80 of synoptic stations have increasing trend Analyzing monthly mean temperature variable showed that in March most of Iran iswithout significant trend and vice versa in April most of them have positive significanttrend Also 75 of Iran s synoptic stations showed an increasing trend in annual meantemperature variable during the studying The results of monthly absolute maximumtemperature trends by Mann Kendall test showed that the variability of trends is low inspring summer seasons June August had more important trend than July In autumnonly Sabzevar Zahedan Khoramabad stations have significant negative trend There isno statistically significant trend in most of synoptic stations in winter season Results ofanalyzing monthly absolute minimum trends by Mann Kendall tests determined that thevariability of trends in winter season compare with spring summer autumn seasons arelow the west corner of Iran have no statistically significant in this season Analyzing ofthis parameter in annual scale showed 21 synoptic stations have no significant trend Theresult of investigation in relative humid showed mixed trends of increasing and decreasingtrends Investigation of relative humid showed Bam station and Shahroud station hadstatistically significant trends throw out the year In addition Bam and Shahroud stationhad statistically significant trend in relative humid in 9 and 15 utc respectively during allof the month Study of faster wind showed increasing and decreasing trends There were

صبوحي، راضيه

بررسي روند پارامترهاي اقليمي در 35 ايستگاه سينو پتيك ايران

اثر گلخانه اي , كولموگروف-اسميرنف , آزمون اسپيرمن