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Selection: with tag standardized-precipitation-index [8 articles] 


A multiscalar drought index sensitive to global warming: the standardized precipitation evapotranspiration index

Journal of Climate In Journal of Climate, Vol. 23, No. 7. (19 November 2009), pp. 1696-1718,


The authors propose a new climatic drought index: the standardized precipitation evapotranspiration index (SPEI). The SPEI is based on precipitation and temperature data, and it has the advantage of combining multiscalar character with the capacity to include the effects of temperature variability on drought assessment. The procedure to calculate the index is detailed and involves a climatic water balance, the accumulation of deficit/surplus at different time scales, and adjustment to a log-logistic probability distribution. Mathematically, the SPEI is similar to the ...


Meteorological droughts in Europe: events and impacts - Past trends and future projections



[Excerpt: Executive Summary] Observational records from 1950 onwards and climate projections for the 21st century provide evidence that droughts are a recurrent climate feature in large parts of Europe, especially in the Mediterranean, but also in western, south-eastern and central Europe. Trends over the past 60 years show an increasing frequency, duration and intensity of droughts in these regions, while a negative trend has been observed in north-eastern Europe. With a changing climate, this tendency is likely to be reinforced during the 21st century, affecting a wide range of ...


World drought frequency, duration, and severity for 1951-2010

International Journal of Climatology, Vol. 34, No. 8. (June 2014), pp. 2792-2804,


In the context of climate change characterized by rising temperature and more extreme precipitation regimes, drought is one of the most relevant natural disasters. This paper presents maps of global drought frequency, duration, and severity for the periods 1951–1970, 1971–1990, and 1991–2010, to give an overview of the respective drought hot spots. Drought frequency is defined as the number of drought events occurred, drought duration as the number of months in drought conditions, and drought severity as the sum of the ...


A review of drought concepts

Journal of Hydrology, Vol. 391, No. 1-2. (September 2010), pp. 202-216,


Owing to the rise in water demand and looming climate change, recent years have witnessed much focus on global drought scenarios. As a natural hazard, drought is best characterized by multiple climatological and hydrological parameters. An understanding of the relationships between these two sets of parameters is necessary to develop measures for mitigating the impacts of droughts. Beginning with a discussion of drought definitions, this paper attempts to provide a review of fundamental concepts of drought, classification of droughts, drought indices, ...


Drought under global warming: a review

Wiley Interdisciplinary Reviews: Climate Change, Vol. 2, No. 1. (January 2011), pp. 45-65,


This article reviews recent literature on drought of the last millennium, followed by an update on global aridity changes from 1950 to 2008. Projected future aridity is presented based on recent studies and our analysis of model simulations. Dry periods lasting for years to decades have occurred many times during the last millennium over, for example, North America, West Africa, and East Asia. These droughts were likely triggered by anomalous tropical sea surface temperatures (SSTs), with La Niña-like SST anomalies leading ...


The relationship of drought frequency and duration to time scales

In Eighth Conference on Applied Climatology (January 1993)


[Excerpt: Introduction] The definition of drought has continually been a stumbling block for drought monitoring and analysis. Wilhite and Glantz (1985) completed a thorough review of dozens of drought definitions and identified six overall categories: meteorological, climatological, atmospheric, agricultural, hydrologic and water management. Dracup et al. (1980) also reviewed definitions. All points of view seem to agree that drought is a condition of insufficient moisture caused by a deficit in precipitation over some time period. Difficulties are primarily related to the time period over which deficits accumulate and to the connection of the deficit in precipitation to deficits in usable ...


Multi-disciplinary forest fire danger assessment in Europe: the potential to integrate long-term drought information

International Journal of Spatial Data Infrastructures Research, Vol. 7 (2012), pp. 300-322,


A key motivation for multi-disciplinary collaborations is the inclusion of data and knowledge from contributing disciplines for the further development of existing models. The objective of this research is to evaluate the potential of using drought information from the European Drought Observatory (EDO) to complement the forest fire danger assessment of the European Forest Fire Information System (EFFIS). Drought conditions are provided through the Standardized Precipitation Index (SPI), which is a spatially invariant and probabilistic year-round index based on precipitation alone. ...


Teaming drought with wildfires: EU researchers suggest new data for Forest Weather Index

IEEE Earthzine, Vol. 5, No. 2. (2012), 379533


[Excerpt] In the summer of 2003, 18 people died and more than 500,000 acres of forests and farmland were destroyed in fires in Portugal, marking the country’s worst fire season on record. These fires raged on the heels of an extreme heat wave – one meteorologists called a 500-year event – that swept over Europe and took the lives of more than 70,000. [\n] Forest fires in the European Union (EU) kill up to 20 people a year on average, including firefighters and ...

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