Construction and analysis of annual precipitation series from 1901 to 2017 in Zhejiang province

doi:10.12006/j.issn.1673-1719.2018.019

Abstract

Abstract:

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%.

Key words: Precipitation series, Stepwise regression, Change characteristics, Catastrophe, Zhejiang province

Jing-Jing XIAO, Zheng-Quan LI, Fen-Fen GUO, Yi-Ping YAO, Hao MA, Kuo WANG, Quan-Pei WEN. Construction and analysis of annual precipitation series from 1901 to 2017 in Zhejiang province[J]. Climate Change Research, 2018, 14(6): 553-561.

Figures/Tables 10

Fig. 1 Fitting equations’ correlation coefficient of 68 stations in Zhejiang province from 1971 to 2013

Fig. 2 Fitting equations’ correlation coefficient of 68 stations in Zhejiang province from 1951 to 2013

Fig. 3 The observation and fitting precipitation curve of Hangzhou station (a) and Wenzhou station (b) from 1901 to 2013

Fig. 4 The mean value of observational precipitation of different stations from 1971 to 2017 (a) , the comparison of observational precipitation and fitting precipitation from 1901 to 2013 (b) of Zhejiang province

Fig. 5 The annual precipitation series in Zhejiang province from 1901 to 2017

Fig. 6 Wavelet analysis of annual precipitation (a) and MK test of annual precipitation (b) from 1901 to 2017 in Zhejiang province

Fig. 7 Climatic tendency (a) and average relative variability (b) of 68 station’s precipitation of Zhejiang province from 1901 to 2017

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