Decline in Mediterranean rainfall caused by weakening of Mediterranean cyclones

Trigo, Isabel F.; Davies, Trevor; Bigg, Grant R.

doi:10.1029/2000gl011526

Cited by 143 publications

(110 citation statements)

References 23 publications

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“…These trend behaviors in the Euro-Mediterranean area could be related to teleconnection patterns which reflect large-scale changes in the atmospheric wave and influence temperature, rainfall, storm tracks, jet stream location and intensity over vast areas [70,71]. Several past studies [72][73][74] showed the impacts of the North Atlantic Oscillation (NAO) especially in the western Mediterranean area. The influence of the NAO is strongest in winter and early spring.…”

Section: Resultsmentioning

confidence: 98%

Drought Analysis in Europe and in the Mediterranean Basin Using the Standardized Precipitation Index

Caloiero

Veltri²,

Caloiero³

et al. 2018

Water

105

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Abstract:In this study, drought events over a large area of the Northern Hemisphere, including continental Europe, Ireland, the United Kingdom, and the Mediterranean basin, were analyzed using the Standardized Precipitation Index (SPI) at various times scales (3, 6, 12, and 24 months). To this purpose, the Global Precipitation Climatology Centre (GPCC) Full Data Monthly Product Version 2018 data set, with spatial resolutions of 0.5 • longitude/latitude and for the period 1951-2016, has been used. First, the temporal evolution of the percentage of grid points, falling within the severe and extreme drought categories, has been evaluated. Then, a trend analysis has been performed at a seasonal scale, considering the autumn-winter and the spring-summer periods, and at an annual scale. The results of this paper highlight that the Mediterranean basin and North Africa are the most consistently vulnerable areas showing a general reduction in SPI values especially for the long time scale.

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Section: Resultsmentioning

confidence: 98%

Drought Analysis in Europe and in the Mediterranean Basin Using the Standardized Precipitation Index

Caloiero

Veltri²,

Caloiero³

et al. 2018

Water

105

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show abstract

“…Most of the climatologies studied the space-frequency distribution of the cyclones (Trigo et al, 1999;Maheras et al, 2001), while others focused on the relation of cyclone frequencies with the precipitation in some areas (Pinto et al, 1999). Trigo et al (2000) in particular, related the observed precipitation decrease in the Northern Mediterranean basin with a decline of the intense Mediterranean cyclones, balanced by an apparent increase of the non-intense ones.…”

Section: Introductionmentioning

confidence: 92%

Time variability of cyclonic geostrophic circulation in the Mediterranean

2006

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Abstract.Interannual variability and trends of the surface geostrophic cyclonic circulation and cyclone frequency in Western and Eastern Mediterranean areas are analyzed, based on a cyclone data base derived from the ERA-40 ECWMF reanalysis (within the MEDEX project tasks), spanning from September/1957 to August/2002. In this 45 years, the cyclonic circulation show a significant decrease in the Western Mediterranean, mostly in winter and spring, and an increase in the Eastern, mainly due to the summer and autumn increase in the frequency of thermal lows.

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“…The decreasing trends in precipitation records over the region have been connected with the persistence of anticyclonic centres (Maheras et al, 1999), as well as with the weakening of Mediterranean cyclones (Trigo and Davies, 2000). To gain more insight into possible changes in the circulation over the eastern Mediterranean during the study period, we present the annual frequencies of the seasonal circulation patterns along with a trend analysis of the prevailing circulation types.…”

Section: Temporal Variability and Trends Of Circulation Typesmentioning

confidence: 99%

Comprehensive analysis of the climate variability in the eastern Mediterranean. Part I: map‐pattern classification

Κωστοπούλου

Jones

2007

Intl Journal of Climatology

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Abstract:This paper provides an extended study of the dominant daily circulation patterns governing the climate variability in the eastern Mediterranean. The methodology adopted to determine the circulation patterns is based on combined analysis of the spatial and temporal variation of rotated principal components of sea-level pressure. A catalogue of characteristic seasonal composites is presented and discussed. It is found that, during winter and spring, large scale features situated in northern Europe affect the atmospheric circulation over the domain of study, whereas the Atlantic (Azores) anticyclone and the Asian Thermal Low define most of the observed circulation types in summer. In autumn, the area exhibits a rapid transition from the warm to cold season showing climatic features from both extreme seasons. Similarities between winter and spring/autumn patterns are detected and correlation analyses are employed between their spatial patterns to reveal that similar circulation patterns occur amongst the three seasons, which usually appear more pronounced during winter. Frequencies and trends of the proposed circulation types are examined for each season. A linear trend analysis for the overall period exhibits a significant increase in the anticyclonic types particularly in winter. With respect to the cyclonic types, statistically significant negative trends have been found in all seasons especially for types associated with depressional activity in central the Mediterranean.

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Decline in Mediterranean rainfall caused by weakening of Mediterranean cyclones

Cited by 143 publications

References 23 publications

Drought Analysis in Europe and in the Mediterranean Basin Using the Standardized Precipitation Index

Drought Analysis in Europe and in the Mediterranean Basin Using the Standardized Precipitation Index

Time variability of cyclonic geostrophic circulation in the Mediterranean

Comprehensive analysis of the climate variability in the eastern Mediterranean. Part I: map‐pattern classification

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