1961-2022年广东省大风天气季节变化特征分析OACSTPCD

Based on the wind speed data from 86 meteorological stations in Guangdong Province from 1961 to 2022,the seasonal variation characteristics and interannual variation of gales in Guangdong were analyzed by using meteorological statistical methods such as concentration degree and concentration period.Results show that gales in Guangdong predominantly occur along the southern coastline and in the central and northern regions of the province.A decreasing trend in gale days was observed in Guangdong from 1971 to 2000,followed by an increasing trend after 2000.Regional patterns were observed in the seasonal variation of gales:gales in the western and central-eastern mountainous regions of Guangdong peak around mid-May,whereas those in the southern coastal areas predominantly occur towards late June.Additionally,interannual evolutions in the seasonal variation of gales have been observed:over the past 62 years,a significant increase in the Gale Concentration Degree(GCD)was noted in areas of Guangdong frequently experiencing gales,and a gradual decrease was observed in the interannual variability of the Gale Concentration Period(GCP).The analysis indicates that in Guangdong,strong convective weather,cold air processes,and tropical cyclones,along with atmospheric circulations like the western Pacific sub-high and the polar vortex,significantly influence the spatial and temporal distribution of gales and the GCD.