Based on data of the surface wind speed at Shijiazhuang city meteorological station (simplified as Shijiazhuang station) and four rural meteorological stations during 1972-2012, urbanization effect on the surface wind speed series at Shijiazhuang station was analyzed using an urban-rural difference method. The results showed that: (1) In 1972-2012, there were very significant decreased trends on annual and seasonal mean wind speeds, mean maximum wind speeds of 10 min and gale days at Shijiazhuang station, and the annual mean decreased trends were -0.15 (m/s)/10a, -1.05 (m/s)/10a and -2.90 d/10a respectively. Annual mean wind speed of rural stations showed weakly decreased trend, the decreased trend on annual mean maximum wind speed of 10 min was more obvious, and the decreased trend on annual gale days was very significant. The decreased trends on annual mean wind speed, annual mean maximum wind speed of 10 min and annual gale days at rural stations were -0.02 (m/s)/10a, -0.21 (m/s)/10a, and 2.19 d/10a, respectively; (2) In the study period, urbanization effect on the annual mean wind speed at Shijiazhuang station was -0.13 (m/s)/10a, which was very significant, and the urbanization contribution reached 86.0%, indicating that the urbanization effect is large and significant. Urbanization effect on the mean wind speeds of the urban station in spring, summer, autumn and winter were -0.16 (m/s)/10a, -0.10 (m/s)/10a, -0.13 (m/s)/10a and -0.15 (m/s)/10a respectively, and the urbanization contributions were 82.8%, 87.6%, 88.6% and 85.4%, respectively; (3) Urbanization effect on the annual mean maximum wind speed of 10 min at the urban station was -0.84 (m/s)/10a, and the urbanization contribution was 79.7%. Urbanization effects on the seasonal mean maximum wind speed of 10 min were -0.94 (m/s)/10a, -0.80 (m/s)/10a, -0.60 (m/s)/10a and -1.01 (m/s)/10a, respectively for spring, summer, autumn and winter, with the urbanization contributions of 90.4%, 78.6%, 64.9% and 79.1%, respectively; (4) Urbanization effect on the annual gale days at Shijiazhuang station was not significant, but the urbanization effect on the winter gale days was large and significant.

%U http://www.climatechange.cn/EN/10.12006/j.issn.1673-1719.2017.030