Science Source
Perkins, S. E., Alexander, L. V., Nairn, J. R.
Geophysical Research Letters
Published date October 27, 2012
Geophysical Research Letters
Published date October 27, 2012
Increasing frequency, intensity and duration of observed global heatwaves and warm spells
- Uses the latest HadGHCND daily temperature dataset, global trends in observed summertime heatwaves
- Calculates and analyzes annual warm spells for 1950–2011
- Studies three indices that separately focus on maximum temperature (TX90pct), minimum temperature (TN90pct) and average temperature (EHF) with respect to five characteristics of event intensity, frequency and duration
- Finds increases in heatwave/warm spell intensity, frequency and duration despite which index is employed
- Finds that 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
- Finds arger increases in TN90pct aspects relative to EHF and TX90pct are also observed
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