1964—2019年辽宁省平均风速时空演变特征及其影响因素

doi:10.13249/j.cnki.sgs.2021.04.018

Abstract

Abstract:

The degree and strength of the wind will cause changes in many meteorological elements. Exploring the temporal and spatial distribution of the wind field and its historical changes can provide important references for climate forecast and scientific utilization of wind energy. Based on the daily monitoring data of wind speed and other meteorological factors data of 23 meteorological stations in Liaoning Province from 1964 to 2019, this paper analyzed the spatial and temporal variation of the wind field and wind speed in Liaoning Province by multi-scale analysis using Empirical Orthogonal Function (EOF), Morlet wavelet analysis and Mann-Kendall non-parametric test. The results show that: 1) During 1964-2019, the average wind speed in Liaoning Province presented a significant decrease with a rate of 0.13 m/(s·10a). Further, this paper indicated that the bimodal distribution is a characteristic of intra-year trend analysis. The four seasons in a year were listed in the sequence as follows based on descending order of the decreasing rate value: spring, winter, autumn and summer. However, no abrupt changes were evident at all scales. 2) The spatial distribution of the average wind speed showed an evolutionary pattern centered on the central region and gradually decreased from east to west on both interannual and interdecadal scales, but the high-value area of the latter gradually changed from strip to point-like distribution. 3) The increase in average temperature and decrease in sunshine hours contributed more to the weakening of the average wind speed in Liaoning Province in the past 56 years. The results of the study provide a theoretical basis for the prevention and mitigation of wind disasters and the scientific utilization of wind energy in the region.

Key words: average wind speed, spatial and temporal evolution characteristics, Empirical Orthogonal Function (EOF), principal component analysis, Liaoning Province

CLC Number:

F129.9

Fan Shuaibang, Xiao Chunliu, Cao Yongqiang, Gao Lu. Multiscale Analysis of Wind Speed and Its Influencing Factors in Liaoning Province From 1964 to 2019[J].SCIENTIA GEOGRAPHICA SINICA, 2021, 41(4): 717-727.

Figures/Tables 19

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Table 1

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序号	EOF
序号	方差贡献率/%	累计贡献率/%
模态1	59.59	59.59
模态2	13.34	72.93
模态3	10.54	83.47
模态4	8.54	92.01

序号	EOF
序号	方差贡献率/%	累计贡献率/%
模态1	59.59	59.59
模态2	13.34	72.93
模态3	10.54	83.47
模态4	8.54	92.01

主成分因子	特征值	方差贡献率/%	累计贡献率/%
1	3.267	65.34	65.34
2	1.219	24.39	89.73
3	0.335	6.70	96.43
4	0.176	3.51	99.94
5	0.003	0.06	100.00

主成分因子	特征值	方差贡献率/%	累计贡献率/%
1	3.267	65.34	65.34
2	1.219	24.39	89.73
3	0.335	6.70	96.43
4	0.176	3.51	99.94
5	0.003	0.06	100.00

指标项	成分1	成分2	成分3	成分4	成分5
平均气温	−0.896	−0.195	−0.065	−0.103	−0.005
最高气温	−0.892	0.445	0.032	0.143	0.015
日照时数	0.818	0.613	0.018	0.012	0.000
最低气温	0.747	0.580	0.022	0.001	0.003
相对湿度	0.665	0.450	0.201	0.000	0.005

Multiscale Analysis of Wind Speed and Its Influencing Factors in Liaoning Province From 1964 to 2019

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