期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 4, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL090317
关键词
binning; dew point temperature; extreme precipitation; global scaling; hourly precipitation; rain‐ gauge data
资金
- INTENSE project
- European Research Council [ERC-2013-CoG-617329]
- Wolfson Foundation
- Royal Society as a Royal Society Wolfson Research Merit Award [WM140025]
- NERC [NE/R01079X/1] Funding Source: UKRI
The study found that hourly precipitation extremes tend to increase with temperature at rates higher than expected from the Clausius-Clapeyron relationship, with different regions showing varying levels of scaling and Europe having higher scaling rates. Additionally, hourly scaling consistently exceeds scaling for daily extreme precipitation.
Hourly precipitation extremes can intensify with temperature at higher rates than expected from thermodynamic increases explained by the Clausius-Clapeyron (CC) relationship (similar to 6.5%/K), but local scaling with surface air temperature is highly variable. Here we use daily dew point temperature, a direct proxy of absolute humidity, to estimate at-gauge local scaling across six macro-regions for a global data set of over 7,000 hourly precipitation gauges. We find scaling rates from CC to 2 x CC at more than 60% of gauges, peaking in the tropics at a median rate of similar to 1.5CC. Moreover, regional scaling rates show surprisingly universal behavior at around CC, with higher scaling in Europe. Importantly for impacts, hourly scaling is persistently higher than scaling for daily extreme precipitation. Our results indicate greater consistency in global scaling than previous work, usually at or above CC, with positive scaling in the (sub)tropics. This demonstrates the relevance of DPT scaling to understanding future changes.
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