Journal ArticleDOI
A Multiscalar Drought Index Sensitive to Global Warming: The Standardized Precipitation Evapotranspiration Index
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In this article, a new climatic drought index, the standardized precipitation evapotranspiration index (SPEI), is proposed, which combines multiscalar character with the capacity to include the effects of temperature variability on drought assessment.Abstract:
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 standardized precipitation index (SPI), but it includes the role of temperature. Because the SPEI is based on a water balance, it can be compared to the self-calibrated Palmer drought severity index (sc-PDSI). Time series of the three indices were compared for a set of observatories with different climate characteristics, located in different parts of the world. Under global warming conditions, only the sc-PDSI and SPEI identified an...read more
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Journal ArticleDOI
Analysis of meteorological and hydrological droughts in the Niger-South Basin, Nigeria
Ajayi Johnson Oloruntade,Ajayi Johnson Oloruntade,Thamer A. Mohammad,Abdul Halim Ghazali,Aimrun Wayayok +4 more
TL;DR: In this paper, the authors applied two meteorological drought indices -standardized precipitation index (SPI), standardized precipitation evapotranspiration index and standardized runoff index (SRI) to investigate the occurrence of drought in the Niger-South Basin (NSB), a sub-catchment of the Niger River Basin in Nigeria, during the period 1970-2008.
Journal ArticleDOI
Lasting effects of climate disturbance on perennial grassland above‐ground biomass production under two cutting frequencies
Marine Zwicke,Giorgio A. Alessio,Lionel Thiery,Robert Falcimagne,René Baumont,Nicolas Rossignol,Jean-François Soussana,Catherine Picon-Cochard +7 more
TL;DR: The grassland community was very sensitive to dehydration during the summer extreme: aerial senescence reached 80% when cumulated climatic water balance fell to -156 mm and biomass declined by 78% at the end of summer, suggesting an absence of buffering effect on grassland production.
Journal ArticleDOI
Using Landsat observations (1988–2017) and Google Earth Engine to detect vegetation cover changes in rangelands - A first step towards identifying degraded lands for conservation
Zunyi Xie,Zunyi Xie,Stuart R. Phinn,Edward T. Game,David J. Pannell,Richard J. Hobbs,Peter R. Briggs,Eve McDonald-Madden +7 more
TL;DR: In this paper, an approach to map changes in vegetation cover amounts at the pixel level (30m) using Google Earth Engine (GEE) was presented, which can be used to identify degraded lands and their utility for achieving conservation endeavours.
Journal ArticleDOI
Copula-based Joint Drought Index using SPI and EDDI and its application to climate change.
TL;DR: It is found that quantification of past drought using CJDI can be used to objectively recognize the level of drought currently in progress by combining with drought severity-duration-frequency curves derived from partial duration series.
Journal ArticleDOI
Spatio‐temporal variability of droughts in Bolivia: 1955–2012
S. M. Vicente-Serrano,O. Chura,Juan I. López-Moreno,Cesar Azorin-Molina,Arturo Sanchez-Lorenzo,Arturo Sanchez-Lorenzo,Enric Aguilar,Enrique Morán-Tejeda,F. Trujillo,R. Martinez,Juan José Nieto +10 more
TL;DR: In this article, the spatio-temporal variability and trends of droughts across Bolivia between 1955 and 2012 were investigated using two climate drought indices: the Standardized Precipitation Index (SPI) which is based on precipitation data, and the standardized precipitation evapotranspiration index (SPEI), based on the difference between the precipitation and the reference ETo.
References
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TL;DR: The first volume of the IPCC's Fourth Assessment Report as mentioned in this paper was published in 2007 and covers several topics including the extensive range of observations now available for the atmosphere and surface, changes in sea level, assesses the paleoclimatic perspective, climate change causes both natural and anthropogenic, and climate models for projections of global climate.
Book
Crop evapotranspiration : guidelines for computing crop water requirements
TL;DR: In this paper, an updated procedure for calculating reference and crop evapotranspiration from meteorological data and crop coefficients is presented, based on the FAO Penman-Monteith method.
The relationship of drought frequency and duration to time scales
TL;DR: The definition of drought has continually been a stumbling block for drought monitoring and analysis as mentioned in this paper, mainly related to the time period over which deficits accumulate and to the connection of the deficit in precipitation to deficits in usable water sources and the impacts that ensue.