Relationship Between Rainfall and Sunspot Activity Cycle in Zhengzhou Based on Wavelet Analysis

doi:10.19657/j.geoscience.1000-8527.2022.080

Abstract

Abstract:

In order to study the correlation-ship of sunspot activity and regional rainfall, we used the continuous wavelet transform method to study the precipitation data of Zhengzhou city (Xinzheng station) since 1980 and the variation of the number of sunspots, and studied the correlation between the two in different periods. Further, rainfall and sunspots were proceed by cross wavelet transform and wavelet coherence spectrum analysis. The rainfall was predicted by sunspots observation number according to the relationship between the two. The results show that there are positive and negative differences in the correlation between the two in different periods. The first main rainfall period scale is a 21-year one, with a 14-year period obtained under this main period scale. Similarly, the first main sunspot period scale is a 16-year one, with a 11-year period obtained under this main period scale, consistent with experience value. The three extra year of rainfall (than sunspots) can explain the positive and negative differences in the curve correlation at different periods. The correlation between rainfall and sunspots is significant on an 8 to 12 year timescale (1992 to 2008) with regular time lag. The rainfall vs. sunspot activity correlation is important on the timescale of 2-4 a and 7-10 a, with regular lag during 1991-2004 and 2006-2013, respectively. There is no obvious correlation between the two in other time scales. Correlation analysis showed that according to the empirical formula for the time delay, rainfall can be predicted from sunspot observations. The results show that the latest peak rainfall is near 2022, close to the 2021 “7·20 heavy rain” in Zhengzhou. The next rainfall valley year is likely around 2028, and the precipita-tion fluctuation or decrease may be greater than before.

Key words: wavelet transform, precipitation, sunspot, solar activity cycle

CLC Number:

P631

QI Shiyang, SHEN Chen, LIU Xiaobiao, ZHANG Mengjiao, MA Xinming. Relationship Between Rainfall and Sunspot Activity Cycle in Zhengzhou Based on Wavelet Analysis[J]. Geoscience, 2023, 37(01): 184-196.

Figures/Tables 12

Fig.1 Comparison chart for the sunspot number and precipitation in Zhengzhou

Fig.2 Contour map for the real-part of wavelet coefficient of the precipitation in Zhengzhou

Fig.3 Contour map for modular of wavelet coefficient of the precipitation in Zhengzhou

Fig.4 Wavelet variance of the precipitation in Zhengzhou

Fig.5 Main period trend chart of the precipitation in Zhengzhou in a 21-year timescale

Fig.6 Contour map for the real-part of wavelet coefficient of the sunspot number

Fig.7 Contour map for the modular of wavelet coefficient of sunspot number

Fig.8 Wavelet variance of the number of sunspots

Fig.9 Main period trend chart of the annual average sunspot number in 16-year timescale

Fig.10 Comparison for the real-part of wavelet coefficient of the number of sunspots and precipitation in Zhengzhou

Fig.11 Cross-sectional wavelet profile of the number of sunspots and precipitation in Zhengzhou

Fig.12 Wavelet coherence map of the number of sunspots and precipitation in Zhengzhou

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