Increasing frequency, intensity and duration of observed global heatwaves and warm spells
Increasing frequency, intensity and duration of observed global heatwaves and warm spells
复制标题
DOI：
10.1029/2012gl053361
复制
发表时间：
2012-10-27
影响因子：
5.2
通讯作者：
Nairn, J. R.
中科院分区：
文献类型：
--
作者：
Perkins, S. E.;Alexander, L. V.;Nairn, J. R.
使用最新的 HadGHCND 每日温度数据集，通过多指标、多方面的框架，对 1950-2011 年观测到的夏季热浪和每年计算的暖期的全球趋势进行了分析。针对事件强度、频率和持续时间五个特征，分别研究了最高气温（TX90pct）、最低气温（TN90pct）和平均气温（EHF）三个指标。无论采用哪种指数，都发现热浪/暖期强度、频率和持续时间有所增加。此外，TX90pct 和 TN90pct 趋势更大，对暖期表现出更大的意义，这意味着非夏季事件正在推动某些地区的年度趋势。还观察到 TN90pct 方面相对于 EHF 和 TX90pct 的较大增加。虽然各指数的事件趋势定性信息相似，但定量值却有所不同。这一结果凸显了在评估持续极端温度事件的影响时采用最合适指数的重要性。引用：Perkins, S. E.、L. V. Alexander 和 J. R. Nairn (2012)，观测到的全球热浪和暖期的频率、强度和持续时间不断增加，地球物理学。资源。快报，39，L20714，doi：10.1029/2012GL053361。
Using the latest HadGHCND daily temperature dataset, global trends in observed summertime heatwaves and annually calculated warm spells for 1950-2011 are analysed via a multi-index, multi-aspect framework. Three indices that separately focus on maximum temperature (TX90pct), minimum temperature (TN90pct) and average temperature (EHF) were studied with respect to five characteristics of event intensity, frequency and duration. Despite which index is employed, increases in heatwave/warm spell intensity, frequency and duration are found. Furthermore, TX90pct and TN90pct trends are larger and exhibit more significance for warm spells, implying that non-summer events are driving annual trends over some regions. Larger increases in TN90pct aspects relative to EHF and TX90pct are also observed. While qualitative information on event trends is similar across the indices, quantitative values vary. This result highlights the importance of employing the most appropriate index when assessing the impact of sustained extreme temperature events. Citation: Perkins, S. E., L. V. Alexander, and J. R. Nairn (2012), Increasing frequency, intensity and duration of observed global heatwaves and warm spells, Geophys. Res. Lett., 39, L20714, doi:10.1029/2012GL053361.