The analysis of the spatiotemporal variations and mechanisms for the near-surface wind speed over China in the last 40 years

This study mainly presents the spatiotemporal characteristics and changes of near-surface wind speed with observations from 679 stations over China for 1979–2019. Furthermore, mechanisms are also investigated. Major results show that larger occur in northern eastern regions, Tibetan Plateau coastal zones China. The spring is than other seasons mean value 2.57 m s?1. Significantly decreased trend detected during 1979–2019, particularly 1979–1996. rates decrease 1979–2019 1979–1996 ? 0.06 s?1 (10a)?1 0.19 (10a)?1, respectively. trends high percentiles more significant low, especially change rate 95th percentile even reaches to 0.48 passes significance test at p < 0.05. However, reversed after 1997. lowest 5th has most reversal trend. Therefore, before 1997 caused by reduction strong wind, while weak wind. variations attributed both U V components. significantly declined surface closely related weakened upper westerly field. In addition, uneven warming between low latitudes may contribute through thermal adaption.