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| Titel |
Storm type effects on super Clausius–Clapeyron scaling of intense rainstorm properties with air temperature |
| VerfasserIn |
P. Molnar, S. Fatichi, L. Gaal, J. Szolgay, P. Burlando |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 4 ; Nr. 19, no. 4 (2015-04-16), S.1753-1766 |
| Datensatznummer |
250120681
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| Publikation (Nr.) |
 copernicus.org/hess-19-1753-2015.pdf |
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| Zusammenfassung |
| Extreme precipitation is thought to increase with warming at rates similar to
or greater than the water vapour holding capacity of the air at
~ 7% °C−1, the so-called Clausius–Clapeyron (CC)
rate. We present an empirical study of the variability in the rates of
increase in precipitation intensity with air temperature using 30 years of
10 min and 1 h data from 59 stations in Switzerland. The analysis is
conducted on storm events rather than fixed interval data, and divided into
storm type subsets based on the presence of lightning which is expected to
indicate convection. The average rates of increase in extremes (95th
percentile) of mean event intensity computed from 10 min data are
6.5% °C−1 (no-lightning events), 8.9% °C−1
(lightning events) and 10.7% °C−1 (all events combined). For
peak 10 min intensities during an event the rates are
6.9% °C−1 (no-lightning events), 9.3% °C−1
(lightning events) and 13.0% °C−1 (all events combined).
Mixing of the two storm types exaggerates the relations to air temperature.
Doubled CC rates reported by other studies are an exception in our data set,
even in convective rain. The large spatial variability in scaling rates
across Switzerland suggests that both local (orographic) and regional effects
limit moisture supply and availability in Alpine environments, especially in
mountain valleys. The estimated number of convective events has increased
across Switzerland in the last 30 years, with 30% of the stations showing
statistically significant changes. The changes in intense convective storms
with higher temperatures may be relevant for hydrological risk connected with
those events in the future. |
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