Characteristics Of Climate Change In Akto County For Recent50Years

This article uses the meteorological data provided by the met office in AktoCounty in Xinjiang, first analyzed the inter-decadal, inter-annual and seasonalclimate change characteristics on temperature, precipitation, evaporation, annualsunshine hours.abrupt of climate were analyzed respectively by slide test, Yamamoto,M-K test, moving t-test to detect these elements. Secondly, the annual and seasonalchanges of frost-free period, last frost date, days of wind speed, relative humidity,dust storm days and other meteorological information, analyzed by employing thesoftware of Spss, Excel.Finally analysis the effects of climate change on foodproduction in recent25years. Research results show that:（1）During the last50years, the temperature of the study area shows a trend ofdecreasing, and the decreasing rate was-0.11℃/10a. It had a tendency ofincreasing in winter, and decreasing in summer, autumn and spring. The averagetemperature in the60s and70s are high than the average temperature,80s and90saverage temperature has dropped; the temperature is rising in the21st century.Temperature mutations appeard in between1980^-1984years, mutations in the springclose to the annual temperatures mutations, the other three quarters ahead.（2）During the last50years, the precipitation of the study area had a trend ofincreasing, and the increasing rate was8.74mm/10a.seasons of spring, summer,autumn and winter precipitation showed an increasing trend. Reliable mutation ofannual precipitation between1980^-1986, does not detect the mutations points ofprecipitation in spring, mutations in summer occurred in1981, autumn and winteroccurred in2000-2002.（3）Annual and seasonal evaporation had a trend of decreasing and thedecreasing rate was-263.17mm/10a, the summer evaporation reduces the most, thewinter evaporation to reduce at least. The evaporation in the1960s has been reduced,but has slightly increasing trend in recent decades. The mutation points ofevaporation occurred in1971and1982, consistent with the spring, summer andwinter catastrophe year lag.（4）Annual and seasonal sunshine houars have been decreasing trend in the past50years, has larger reductions in1990s. Sunshine houars up to the year1963, at leastthe year2009. Sunshine hour’s mutation occurred in1983^-1984, the spring mutationoccurred in1982^-1989, summer mutation took place in1985^-1993, and the autumn mutation occurred in1991^-1992, the winter mutation occurred in the1983^-1990.（5）Over the years the first frost date to speed ahead of1.2d/10a, Last frost datepostponed at a1.03d/10a rate, Frost at a9.6d/10a speed short,≥10℃accumulatedtemperature has downward trend, rates of change for-58.6℃/10a.the average windspeed and the number of gale days a downward trend,speed as-0.44m.s^-1/10a,-5.9d/10a.the average relative humidity showed an increasing trend,rates of change for2.9%/10a.days of sandstorm has declined, rates of change for-5.2d/10a.（6）Temperatures have increasing trend in Kashi city, Atushi city, Shache County,the larges temperature increasing occurred in Kashi city. Temperature showed adownward trend in Akto County. Precipitation has increasing trend, the greatestincreases in Atushi City, and the smallest in Shache County.