globalchange  > 全球变化的国际研究计划
DOI: 10.5194/nhess-19-1629-2019
WOS记录号: WOS:000478951800001
论文题名:
Impact of the dry-day definition on Mediterranean extreme dry-spell analysis
作者: Rivoire, Pauline1; Tramblay, Yves1; Neppel, Luc1; Hertig, Elke2; Vicente-Serrano, Sergio M.3
通讯作者: Tramblay, Yves
刊名: NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
ISSN: 1561-8633
EISSN: 1684-9981
出版年: 2019
卷: 19, 期:8, 页码:1629-1638
语种: 英语
WOS关键词: PARTIAL DURATION SERIES ; REFERENCE EVAPOTRANSPIRATION ; FREQUENCY-ANALYSIS ; IBERIAN PENINSULA ; DROUGHT ; TRENDS ; SPAIN ; PRECIPITATION ; DISTRIBUTIONS ; VARIABILITY
WOS学科分类: Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS研究方向: Geology ; Meteorology & Atmospheric Sciences ; Water Resources
英文摘要:

To define a dry day, the most common approach is to identify a fixed threshold below which precipitation is considered equivalent to zero. This fixed threshold is usually set to account for measurement errors and precipitation losses due to the atmospheric evaporation demand. Yet, this threshold could vary in time according to the seasonal cycle and in the context of long-term trends, such as the increase in temperature due to climate change. In this study, we compare extreme dry spells, defined either with a fixed threshold for a dry day (1 mm) or with a time-varying threshold estimated from reference evapotranspiration (ET0), for a large database of 160 rain gauges covering large parts of the Mediterranean basin. Results indicated positive trends in ET0 during summer months (June, July and August) in particular. However, these trends do not imply longer dry spells since the daily precipitation intensities remain higher than the increase in the evaporative demand. Results also indicated a seasonal behavior: in winter the distribution of extreme dry spells is similar when considering a fixed threshold (1 mm) or a time-varying threshold defined with ET0. However, during summer, the extreme dry-spell durations estimated with a 1 mm threshold are strongly underestimated in comparison to extreme dry spells computed with ET0. We stress the need to account for the atmospheric evaporative demand instead of using fixed thresholds for defining a dry day when analyzing dry spells, with respect to agricultural impacts in particular.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/145236
Appears in Collections:全球变化的国际研究计划

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作者单位: 1.Univ Montpellier, CNRS, HSM, IRD, Montpellier, France
2.Univ Augsburg, Inst Geog, Augsburg, Germany
3.CSIC, IPE, Campus Aula Dei, Zaragoza, Spain

Recommended Citation:
Rivoire, Pauline,Tramblay, Yves,Neppel, Luc,et al. Impact of the dry-day definition on Mediterranean extreme dry-spell analysis[J]. NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,2019-01-01,19(8):1629-1638
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