A ranking of high‐resolution daily precipitation extreme events for the Iberian Peninsula

Ramos, Alexandre M.; Trigo, Ricardo M.; Liberato, Margarida L. R.

doi:10.1002/asl2.507

Cited by 60 publications

(103 citation statements)

References 19 publications

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“…This ranking of wet spell events in the area of the Danube River Basin is based on the method developed by Ramos et al [20,21], which used daily-normalised precipitation anomalies for the ranking of multi-day extreme precipitation events according to the accumulated amount of precipitation and the spatial distribution in the Iberian Peninsula.…”

Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

“…This method [20] for the Iberian Peninsula was partially adapted from another approach [28], that has suggested some criteria to classify each day in terms of extremeness using different meteorological variables. The use of normalised precipitation departures from the seasonal climatology allows us to measure the rarity of an event given by the standardised precipitation anomalies.…”

Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

“…With this standardisation, we are assured of the different statistical distribution of daily areal precipitation among different areas that are being studied. Therefore, it [20,21] can be applied easily to other regions of the world using different gridded precipitation datasets (model data or observations), and the use of different time scales [21] is directly applicable to assess persistent precipitation episodes over a certain region.…”

Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

“…To obtain a final R index to calculate the wet spell events in different durations, several steps should be applied prior to the final ranking (as in [20,21]). In the first step, we calculated daily normalised precipitation anomalies (N) for each grid point as the difference between the precipitation values for the day under analysis and the daily mean climatological value and later divided by the daily standard deviation climatological value.…”

Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

“…In this study, for the identification and selection of wet spell events, we used the methodology developed by Ramos et al [20,21] for the ranking of high-resolution daily precipitation extremes. The long time period analysed was from 1981 to 2015.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Wet Spells and Associated Moisture Sources Anomalies across Danube River Basin

Ciric

Nieto

Ramos

et al. 2017

Water

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Abstract:The Danube River Basin is the second longest catchment basin in Europe and exhibits intense climatological diversity. In recent decades, the frequency and intensity of daily precipitation extremes have suffered from an increment in many parts of the world, including Central and Eastern Europe. Wet spells are defined by the number of consecutive rainy days with different thresholds. The identification of wet spells and their trends in the rainfall time is very important for many sectors, such as agriculture, ecology, hydrology and water resources. Wet spells can lead to extreme events and cause floods and other disasters. In this study, we will attempt to characterise global precipitation in the context of wet spells and associated precipitation depth of wet spells in the Danube River Basin area using daily precipitation data, as well as analysing different approaches to identifying wet spells. The ten most intense wet spells were detected, and the most intense, which occurred on 23 September 1996, was studied in depth in terms of precipitation and associated anomalies, the synoptic situation and the anomalous transport of moisture using a Lagrangian approach. The existence of a marked west-east dipole in the field of sea level pressure between the Atlantic Ocean and the eastern Mediterranean leads to the anomalous moisture transport from the Northern Atlantic Ocean to the Mediterranean Sea, where a higher available amount of moisture existed, and subsequently penetrated within the low positioned over the Danube River Basin. In addition, an Atmospheric River was also responsible for the wet conditions in the Danube River Basin. The combination of all these factors was responsible for the extreme precipitation linked with the wet spell.

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Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

Section: Ranking Of Wet Spell Extreme Precipitation Eventsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wet Spells and Associated Moisture Sources Anomalies across Danube River Basin

Ciric

Nieto

Ramos

et al. 2017

Water

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Quantifying changes in climate variability and extremes: Pitfalls and their overcoming

Sippel

Zscheischler

Heimann

et al. 2015

Geophysical Research Letters

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Hot temperature extremes have increased substantially in frequency and magnitude over past decades. A widely used approach to quantify this phenomenon is standardizing temperature data relative to the local mean and variability of a reference period. Here we demonstrate that this conventional procedure leads to exaggerated estimates of increasing temperature variability and extremes. For example, the occurrence of “two‐sigma extremes” would be overestimated by 48.2% compared to a given reference period of 30 years with time‐invariant simulated Gaussian data. This corresponds to an increase from a 2.0% to 2.9% probability of such events. We derive an analytical correction revealing that these artifacts prevail in recent studies. Our analyses lead to a revision of earlier reports: For instance, we show that there is no evidence for a recent increase in normalized temperature variability. In conclusion, we provide an analytical pathway to describe changes in variability and extremes in climate observations and model simulations.

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Understanding climate change projections for precipitation over western Europe with a weather typing approach

et al. 2016

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Precipitation over western Europe (WE) is projected to increase (decrease) roughly northward (equatorward) of 50°N during the 21st century. These changes are generally attributed to alterations in the regional large-scale circulation, e.g., jet stream, cyclone activity, and blocking frequencies. A novel weather typing within the sector (30°W-10°E, 25-70°N) is used for a more comprehensive dynamical interpretation of precipitation changes. A k-means clustering on daily mean sea level pressure was undertaken for ERA-Interim reanalysis . Eight weather types are identified: S1, S2, S3 (summertime types), W1, W2, W3 (wintertime types), B1, and B2 (blocking-like types). Their distinctive dynamical characteristics allow identifying the main large-scale precipitation-driving mechanisms. Simulations with 22 Coupled Model Intercomparison Project 5 models for recent climate conditions show biases in reproducing the observed seasonality of weather types. In particular, an overestimation of weather type frequencies associated with zonal airflow is identified. Considering projections following the (Representative Concentration Pathways) RCP8.5 scenario over 2071-2100, the frequencies of the three driest types (S1, B2, and W3) are projected to increase (mainly S1, +4%) in detriment of the rainiest types, particularly W1 (À3%). These changes explain most of the precipitation projections over WE. However, a weather type-independent background signal is identified (increase/decrease in precipitation over northern/southern WE), suggesting modifications in precipitation-generating processes and/or model inability to accurately simulate these processes. Despite these caveats in the precipitation scenarios for WE, which must be duly taken into account, our approach permits a better understanding of the projected trends for precipitation over WE. (2016), Understanding climate change projections for precipitation over western Europe with a weather typing approach,

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A ranking of high‐resolution daily precipitation extreme events for the Iberian Peninsula

Cited by 60 publications

References 19 publications

Wet Spells and Associated Moisture Sources Anomalies across Danube River Basin

Wet Spells and Associated Moisture Sources Anomalies across Danube River Basin

Quantifying changes in climate variability and extremes: Pitfalls and their overcoming

Understanding climate change projections for precipitation over western Europe with a weather typing approach

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