Role of Convective Precipitation in the Relationship between Subdaily Extreme Precipitation and Temperature
- Role of Convective Precipitation in the Relationship between Subdaily Extreme Precipitation and Temperature
- MIN, SEUNG KI; PARK, IN HONG
- POSTECH Authors
- MIN, SEUNG KI
- Date Issued
- American Meteorological Society
- On a subdaily time scale, the intensities of extreme precipitation are observed to increase with temperature
at a rate exceeding water vapor constraints determined by the Clausius–Clapeyron (C-C) relationship. This
so-called super C-C scaling has been suggested to occur as a result of 1) the statistical effect that involves the
transition of precipitation types from stratiform to convective events and 2) the physical effect by which the
convective process itself can overcome the thermodynamic limitation. This study examines these two
mechanisms for the super C-C relationship using in situ observations in South Korea for a recent 35-yr period,
focusing on the role of convective rainfall. Scaling results show that hourly extreme precipitation undergoes a
transition from a C-C rate to a super C-C rate at around 208C, supporting the statistical effect. The transition
temperature observed in South Korea is, however, much higher than in European regions (128C), which seems
to be due to the climatologically lower frequency of convective events in South Korea than in Europe.
Nevertheless, the threshold fraction of convective precipitation when the scaling transition starts to occur is
found to very similar between two regions, around 0.2, indicating the important role of convective events in
shaping the scaling. On the other hand, convective extreme precipitation alone exhibits a super C-C scaling,
suggesting that the physical effect is also at work in South Korea. Also, the scaling shows a robust peaklike
shape with maximum precipitation intensity near 248C, which is closely linked with moisture limitation at high
temperature, supporting the previous findings.
- Article Type
- JOURNAL OF CLIMATE, 2017-12
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