研究人员通过重建南半球最长的高频气压观测数据，追踪了自1830年以来影响Perth地区的严重风暴演变规律[1]。这项分析利用来自四个历史观测点的近200年气压、温度和降雨记录，在这一时期内识别出141场严重风暴[1]。其中，1927年6月17日Perth遭遇的风暴最为剧烈，风速达到128公里/小时[1]。
研究发现，自1970年以来Perth的冬季风暴数量出现显著下降[1]。这一趋势与大气环流模式的变化密切相关——Hadley环流的扩展导致亚热带高压带向极地移动，进而减少了该地区的降雨[1]。西南澳大利亚的冬季降雨量自1970年以来已下降20%[1]。历史数据表明当前的风暴衰退具有异常的持久性，2010-2019年十年间的风暴数量为自1830年以来最少[1]。
Researchers have reconstructed the Southern Hemisphere's longest high-frequency atmospheric pressure record by analyzing nearly two centuries of Perth observational data on pressure, temperature, and rainfall, tracking severe storms dating back to 1830 [1]. The analysis identified 141 major storms that impacted Perth between 1830 and 2024 [1].
The research reveals a significant decline in winter storms across Perth since 1970 [1], driven primarily by the expansion of the Hadley circulation, which has shifted the subtropical high-pressure belt toward the poles [1]. This atmospheric shift has resulted in a 20 percent reduction in winter rainfall across southwestern Australia since 1970 [1]. The current downturn in storm activity is notably persistent by historical standards—the decade from 2010 to 2019 recorded the fewest storms since records began in 1830 [1].
Historical records document extreme weather events in Perth's past, including a severe storm on June 17, 1927, which produced wind speeds of 128 kilometers per hour [1]. The historical data compilation drew from four distinct observation sites spanning the study period: Swan River (1830–1875), Perth Gardens (1876–1900), Perth Observatory (1897–1908), and Perth Regional Office (1907–1944) [1].
