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首页> 外文期刊>Journal of hydrometeorology >Long-Term Temporal Variation of Extreme Rainfall Events in Australia: 1910-2006
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Long-Term Temporal Variation of Extreme Rainfall Events in Australia: 1910-2006

机译:1910-2006年澳大利亚极端降雨事件的长期时间变化

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摘要

The temporal variability of the frequency of short-duration extreme precipitation events in Australia for the period 1910-2006 is examined using the high-quality rainfall dataset identified by the Bureau of Meteorology, Australia, for 189 stations. Extreme events are defined by duration and recurrence interval: 1, 5, 10, and 30 days, and 1, 5, and 20 yr, respectively. The results indicate that temporal variations of the extreme precipitation index (EPI) for various durations and recurrence intervals in the last 100 yr, except for the low frequencies before 1918, have experienced three U-shaped cycles: 1918-53, 1953-74, and 1974-2006. Seasonal results indicate that about two-thirds of 1-day, 1-yr recurrence interval extreme events occur from December to March. Time series of anomalies of the regional EPIs for four regions indicate that northeast Australia and southeast Australia have almost the same temporal variation as the national anomalies, South Australia experienced a negative anomaly of extreme rainfall events in the mid-1950s, and southwest Western Australia (SWWA) experienced relatively small temporal variation. The relationships between extreme rainfall events and the Southern Oscillation index (SOI) and the interdecadal Pacific oscillation (IPO) indicate that extreme rainfall events in Australia have a strong relationship with both, especially during La Nina years and after 1942.
机译:使用澳大利亚气象局为189个台站确定的高质量降雨数据集,对1910-2006年间澳大利亚短时极端降雨事件发生频率的时间变化进行了检验。极端事件由持续时间和复发间隔定义:分别为1、5、10和30天,以及1、5和20年。结果表明,除1918年之前的低频外,最近100年内不同持续时间和复发间隔的极端降水指数(EPI)的时间变化经历了三个U形周期:1918-53、1953-74,和1974-2006年。季节性结果表明,在1天,1年复发间隔的极端事件中,约有三分之二发生在12月至3月。四个地区的区域EPI的时间序列异常表明,澳大利亚东北部和澳大利亚东南部与国家异常具有几乎相同的时间变化,南澳大利亚在1950年代中期经历了极端降雨事件的负异常,而澳大利亚西南部( SWWA)经历了相对较小的时间变化。极端降雨事件与南方涛动指数(SOI)和年代际太平洋振荡(IPO)之间的关系表明,澳大利亚的极端降雨事件与二者都有很强的关系,尤其是在拉尼娜(La Nina)年和1942年之后。

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