期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 1, 页码 74-83出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062247
关键词
precipitation; extremes; temperature; dew point temperature; CAPE
资金
- National Science Foundation [EAR-0910721]
- Masdar Institute (One-to-One MIT-MI) [12WAMA1, Flagship 12WAMC1]
- Masdar Institute Cooperative Program
- Lamont Doherty Earth Observatory
- Columbia Department of Earth and Environmental Sciences
We analyze how extreme rainfall intensities in the Eastern United States depend on temperature T, dew point temperature T-d, and convective available potential energy CAPE, in addition to geographic sub-region, season, and averaging duration. When using data for the entire year, rainfall intensity has a quasi Clausius-Clapeyron (CC) dependence on T, with super-CC slope in a limited temperature range and a maximum around 25 degrees C. While general, these features vary with averaging duration, season, the quantile of rainfall intensity, and to some extent geographic sub-region. By using T-d and CAPE as regressors, we separate the effects of temperature on rainfall extremes via increased atmospheric water content and via enhanced atmospheric convection. The two contributions have comparable magnitudes, pointing at the need to consider both T-d and atmospheric stability parameters when assessing the impact of climate change on rainfall extremes.
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