Temporal and Spatial Variation Characteristics of Precipitation,Temperature and Evaporation in Linyi in Recent 50 Years
In order to provide a theoretical reference for the efficient use of climate resources for the future develop-ment of agricultural production in Linyi,the temporal variation characteristics of three meteorological elements(precipi-tation,temperature and evaporation)in the past 50 years were studied.Linear regression analysis,empirical orthogonal decomposition function(EOF)and Morlet wavelet function were used to reveal its trend,temporal and spatial modes and multi-time scale characteristics.The precipitation(2.09 mm/a)and temperature(0.04℃/a)in Linyi City show a syn-chronous growth trend,while evaporation(-6.47 mm/a)shows a decreasing trend of"evaporation paradox"due to the significant decrease of energy for evaporation.In terms of spatial distribution,precipitation is dominated by the first mode with a consistent growth trend of less in the whole region in the early stage and more in the later stage,supplemented by the second mode with inverse phase change in the southeast-northwest direction,with large interannual fluctuations only in Yinan;Temperature shows a pattern of warming change with outstanding homogeneity;Evaporation is highly hetero-geneous with two main modes,dominated by a spatial pattern different from other regions in Junan.All three meteoro-logical elements have interannual and interdecadal variations in the short-term(5 a),medium-term(16 a),and long-term(25 a),with precipitation dominated by 16 a,mean annual temperature by 24 a,and annual evapotranspiration by 31 a.In the short-term future,the regional precipitation and temperature in Linyi will experience decreasing changes above the multi-year average,and evaporation shows increasing changes above the multi-year average.The local regional climate changes in Yinan and Junan should be focused on.
万方数据
维普
