Change of extreme rainfall indexes at Ebro River Basin

Valencia, J. L.; Tarquis, Ana M.; Saá-Requejo, Antonio; Gascó, J. M.

doi:10.5194/nhess-12-2127-2012

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…In this sense, it is interesting to note that since the late 1970s the teleconnection pattern index NAO (North Atlantic Oscillation)-which measures the variation in the pressure difference between the Azores and Iceland-experienced a clear growth generally reaching positive values after that date, whereas in the preceding decades it usually took negative values. Several studies show that this index is negatively correlated with the intensity of the rainfall collected in the Ebro River Basin [17,60]. In addition, this relationship has been found using the mean monthly rainfall within the watershed with the data of the present study.…”

Section: Discussionsupporting

confidence: 82%

Spatial Modeling of Rainfall Patterns over the Ebro River Basin Using Multifractality and Non-Parametric Statistical Techniques

Valencia

Tarquis

Saa

et al. 2015

Water

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Rainfall, one of the most important climate variables, is commonly studied due to its great heterogeneity, which occasionally causes negative economic, social, and environmental consequences. Modeling the spatial distributions of rainfall patterns over watersheds has become a major challenge for water resources management. Multifractal analysis can be used to reproduce the scale invariance and intermittency of rainfall processes. To identify which factors are the most influential on the variability of multifractal parameters and, consequently, on the spatial distribution of rainfall patterns for different time scales in this study, universal multifractal (UM) analysis-C1, α, and γs UM parameters-was combined with non-parametric statistical techniques that allow spatial-temporal comparisons of distributions by gradients. The proposed combined approach was applied to a daily rainfall dataset of 132 time-series from 1931 to 2009, homogeneously spatially-distributed across a 25 km × 25 km grid covering the Ebro River Basin. A homogeneous increase in C1 over the watershed and a decrease in α mainly in the western regions, were detected, OPEN ACCESSWater 2015, 7 6205 suggesting an increase in the frequency of dry periods at different scales and an increase in the occurrence of rainfall process variability over the last decades.

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Section: Discussionsupporting

confidence: 82%

Spatial Modeling of Rainfall Patterns over the Ebro River Basin Using Multifractality and Non-Parametric Statistical Techniques

Valencia

Tarquis

Saa

et al. 2015

Water

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“…We considered the NAO index, the WeMOi and finally defined a new index, IBEI, which focuses on the dominant flow pattern over the Iberian Peninsula. A similar study was conducted by Valencia et al (2012) The CDFs for these indexes (Fig. 8) reveal a few interesting features linked to the most favorable flows for the generation of extreme precipitation episodes in the region.…”

Section: Daily Rainfall Recordssupporting

confidence: 58%

Daily precipitation records over mainland Spain and the Balearic Islands

Ramis

Homar

Amengual

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Abstract. Understanding the spatial distribution of extreme precipitations is of major interest in order to improve our knowledge of the climate of a region and its relationship with society. These analyses inevitably require the use of directly observed values to account for the actual extreme amounts rather than analyzed gridded values. A study of daily rainfall extremes observed over mainland Spain and the Balearic Islands is performed by using records from 8135 rain gauge stations from the Spanish Weather Agency (AEMET). Results show that the heaviest daily precipitations have been observed mainly on the coastal Mediterranean zone from Gibraltar to the Pyrenees. In particular, a record value of 817 mm was recorded in the Valencia region in 1987. The current map of daily records in Spain, which updates the pioneering work of the Spanish meteorologist Font, shows similar distribution of extreme events but with notably higher amounts. Generalized extreme values distributions fit the Mediterranean and Atlantic rain gauge measurements and shows the different characteristics of the extreme daily precipitations in both regions. We identify the most extreme events (above 500 mm per day) and provide a brief description of a typical meteorological situation in which these damaging events occur. An analysis of the low-level circulation patterns producing such extremes -by means of simple indices such as NAO, WeMOi and IBEI -confirms the relevance of local flows in the generation of either Mediterranean or Atlantic episodes. WeMOi, and even more IBEI, are good discriminants of the region affected by the record precipitation event.

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“…The NAO is described as a meridional oscillation of atmospheric mass with centres of action near the Azores high and the Icelandic low. General effects of the NAO on precipitation, with positive (negative) correlations in the northern (southern) part of Europe in winter, have been documented in many studies (Valencia et al ., ; Irannezhad et al ., ; Pokorná and Huth, ). The line of zero correlation is located approximately at 50°N in western and central Europe and more northwards in eastern Europe.…”

Section: Introductionmentioning

confidence: 99%

Trends of precipitation characteristics in the Czech Republic over 1961–2012, their spatial patterns and links to temperature and the North Atlantic Oscillation

Beranová

Kyselý

2017

Intl Journal of Climatology

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Daily precipitation data from 162 stations in the Czech Republic over 1961–2012 are used to examine changes in seasonal precipitation indices, their spatial patterns and links to temperature and atmospheric circulation. The results show a divide between the western and eastern parts of the country as to trends in most precipitation characteristics in both winter and summer. Increases were more pronounced in the west, where Atlantic influences are stronger. In the eastern region, where continental and Mediterranean influences become more important, the trends are often inconclusive. Aggregated over the country as a whole, positive trends of mean precipitation as well as indices of precipitation intensity and extremes dominate in both winter and summer, and the mean precipitation trends are significant at a much larger percentage of stations than previously reported for 1961–2005. Spring is the only season with prevailing negative trends in mean precipitation and the number of wet days. The trends are least conclusive and close to zero in autumn. The trends differ for cold days (below the seasonal 25th percentile of daily maximum temperature) and warm days (above the seasonal 75th percentile). In contrast to overall winter trends, negative trends of mean precipitation, seasonal maxima and number of wet days prevail on cold days in winter. In summer, by far the most pronounced positive trends occur during warm days, when most precipitation comes from convective storms. Longitudinal dependency was found for most indices in winter and for mean precipitation and the number of wet days in summer. The different influence of the North Atlantic Oscillation on precipitation in the western and eastern parts of the Czech Republic together with positive (negative) trend of the North Atlantic Oscillation index in winter (summer) may contribute to the longitudinal dependency of the precipitation trends.

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Change of extreme rainfall indexes at Ebro River Basin

Cited by 15 publications

References 30 publications

Spatial Modeling of Rainfall Patterns over the Ebro River Basin Using Multifractality and Non-Parametric Statistical Techniques

Spatial Modeling of Rainfall Patterns over the Ebro River Basin Using Multifractality and Non-Parametric Statistical Techniques

Daily precipitation records over mainland Spain and the Balearic Islands

Trends of precipitation characteristics in the Czech Republic over 1961–2012, their spatial patterns and links to temperature and the North Atlantic Oscillation

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