Spatial and temporal patterns of precipitation over mainland China and new facts
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Abstract:
Based on the 54-year yearly grid precipitation data of mainland China from 1961 to 2014, the inverse distance weighted interpolation method was used to analysis the spatial-temporal variation on precipitation. Annual precipitation was classified by different quantities and the 54-year area percentage variation of each type was calculated out. A concept of precipitation barycenter was introduced. This study took the amount of precipitation as weights to estimate the annual precipitation barycenter and its changing features. The results show that area percentage variation of each annual precipitation type and the coordinate changing of annual precipitation barycenter were in random sequence with clearly fluctuant features. The annual precipitation type of 400~600mm accounts for the largest area proportion. Also its trend and fluctuation range are the most significant one. By the significant effect of precipitation variability in Northeast and North China, the divergence of precipitation barycenter is larger in northeast-southwest direction. So it can indicate the regional climate abnormal variation. Annual precipitation barycenter changing of the 54 years is most related to >1400mm rainfall area at the latitudinal direction(Y-coordinate). In terms of the longitudinal direction(X-coordinate), there is on obvious correlation. So at this space (mainland China) and time (54years from 1961~2014) scale, the overall precipitation patterns did not change significantly.