IMERG-Based Meteorological Drought Analysis over Italy

Caloiero, Tommaso; Caroletti, Giulio Nils; Coscarelli, Roberto

doi:10.3390/cli9040065

Cited by 42 publications

(23 citation statements)

References 44 publications

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“…The results of these studies performed at different timescales, from monthly to annual, evidenced a general rainfall reduction in the western side of the Mediterranean basin [3,4]. In particular, several rainfall trend studies have focused on the Italian territory, although, due to the lack of a national database, these studies have essentially been conducted at a regional or slightly larger scale [5]. In fact, in Italy, data collection has been independently managed by the single regions since 1998; therefore, data significantly from differ one region to another with regard to time aggregation, quality and observation period.…”

Section: Introductionmentioning

confidence: 99%

The Long-Term ERA5 Data Series for Trend Analysis of Rainfall in Italy

2022

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Nowadays, the Mediterranean region is generally recognized as a climate change hot spot given its strong response to global warming, with relevant impacts on rainfall amount and distribution. Within this context, in this work the temporal variability of rainfall at annual, seasonal and monthly scale was analyzed in Italy using rainfall data extracted from the reanalysis dataset ERA5-Land during the period 1950–2020. In particular, rainfall trend magnitude and significance have been estimated by means of non-parametric tests applied to 3215 grid points falling within the Italian territory. The main results of this analysis evidenced only a few relevant trends at the annual scale, mostly involving northern Italy (positive trend) and the Sardinia region (negative trend). At seasonal scale, the results showed a marked negative trend in winter, characterizing almost all the Italian territory, while in the other seasons a positive trend was identified in the majority of grid points, especially in the Alps. Finally, at the monthly scale, September was identified as the month of the year with the highest percentage of grid points with positive trends mainly located in central, southern, and north-eastern Italy.

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Section: Introductionmentioning

confidence: 99%

The Long-Term ERA5 Data Series for Trend Analysis of Rainfall in Italy

2022

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“…Therefore, each drought event has a period of time that is defined by its onset and end, which is called drought duration. Drought severity is defined as accumulated index deficit, which indicates the amount of moisture deviation from normal during a determined period [41]. Acute water resource problems during droughts are generally associated with long-term and severe events.…”

Section: Drought Definition and Characteristicsmentioning

confidence: 99%

Meteorological and Hydrological Drought Risk Assessment Using Multi-Dimensional Copulas in the Wadi Ouahrane Basin in Algeria

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Bazrafshan

Wałęga

et al. 2022

Water

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A persistent precipitation deficiency (meteorological drought) could spread to surface water bodies and produce a hydrological drought. Meteorological and hydrological droughts are thus closely related, even though they are separated by a time lag. For this reason, it is paramount for water resource planning and for drought risk analysis to study the connection between these two types of drought. With this aim, in this study, both meteorological and hydrological drought were analyzed in the Wadi Ouahrane Basin (Northwest Algeria). In particular, data from six rainfall stations and one hydrometric station for the period 1972–2018 were used to evaluate the Standardized Precipitation Index (SPI) and the Standardized Runoff Index (SRI) at multiple timescales (1, 2, 3, 4, …, 12 months). By means of a copula function, the conditional return period for both types of drought was evaluated. Results evidenced that runoff is characterized by high level of temporal correlation in comparison to rainfall. Moreover, the composite index JDHMI (Joint Deficit Hydro-meteorological Index) was evaluated. This index is able to reflect the simultaneous hydrological and meteorological behavior at different timescales of 1–12 months well and can present the probability of a common hydrological and meteorological deficit situation more accurately and realistically compared to precipitation or runoff-based indicators. It was found that, over the analyzed basin, the average severity of combined hydro-meteorological drought (JDHMI) was 10.19, with a duration of 9 months and a magnitude of 0.93.

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“…Moreover, duration, severity, and intensity were estimated using the run theory applied to the 12-month SPI series, and thus DD and WD are expressed in years. This methodology has been applied in past studies performed for several areas of the world [35].…”

Section: Run Theorymentioning

confidence: 99%

Spatial and Temporal Analysis of Dry and Wet Spells in the Wadi Cheliff Basin, Algeria

et al. 2021

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The Mediterranean Basin, located in a transition zone between the temperate and rainy climate of central Europe and the arid climate of North Africa, is considered a major hotspot of climate change, subject to water scarcity and drought. In this work, dry and wet spells have been analyzed in the Wadi Cheliff basin (Algeria) by means of annual precipitation observed at 150 rain gauges in the period 1970–2018. In particular, the characteristics of dry and wet spells (frequency, duration, severity, and intensity) have been evaluated by means of the run theory applied to the 12-month standardized precipitation index (SPI) values. Moreover, in order to detect possible tendencies in the SPI values, a trend analysis has been performed by means of two non-parametric tests, the Theil–Sen and Mann–Kendall test. The results indicated similar values of frequency, severity, duration, and intensity between the dry and the wet spells, although wet events showed higher values in the extreme. Moreover, the results of the trend analysis evidenced a different behavior between the northern side of the basin, characterized by a negative trend in the 12-month SPI values, and the southern side, in which positive trends were detected.

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IMERG-Based Meteorological Drought Analysis over Italy

Cited by 42 publications

References 44 publications

The Long-Term ERA5 Data Series for Trend Analysis of Rainfall in Italy

The Long-Term ERA5 Data Series for Trend Analysis of Rainfall in Italy

Meteorological and Hydrological Drought Risk Assessment Using Multi-Dimensional Copulas in the Wadi Ouahrane Basin in Algeria

Spatial and Temporal Analysis of Dry and Wet Spells in the Wadi Cheliff Basin, Algeria

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