1 Zhejiang Climate Center, Zhejiang Meteorological Service, Hangzhou 310017, China 2 Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China 3 Wuhan Regional Climate Center, Hubei Meteorological Service, Wuhan 430074, China
Based on homogeneous precipitation data and GPCC lattice data, the annual precipitation series from 1901 to 2017 that could represent the Zhejiang province was constructed by using the stepwise regression method, and characteristics of the precipitation series were analyzed through the Morlet wavelet analysis and MK method. Results showed that monthly precipitation series of 68 stations in Zhejiang from 1951 to 2017 were homogeneous by using RHtest method, and the fitting equations had nice fitting results for each stations. Combined with the fitted values, incomplete observation precipitation data were preprocessed by using interpolation and extension, annual precipitation series were constructed in Zhejiang province from 1901 to 2017. The characteristic analysis showed that there was no obvious long-term trend of precipitation in Zhejiang province from 1901 to 2017. Wavelet analysis showed that the significant oscillation period of precipitation cycle was about 56 a and 35 a for annual precipitation over Zhejiang from 1901 to 2017. A precipitation catastrophe appeared in 1960 for annual mean from a rainy period to a less rainy period. The climatic tendency of precipitation was distributed high in the northeast and low in the southwest, with a range of -15.6 to 19.1 mm/10a in Zhejiang province from 1901 to 2017. The average relative variation of precipitation was distributed low in the north and high in the south, with a range of 11.1% to 20.2%.
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