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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Long-term spatiotemporal variation of drought patterns over the Greater Horn of Africa
Gebremedhin Gebremeskel Haile,Qiuhong Tang,Guoyong Leng,Guoqiang Jia,Jie Wang,Diwen Cai,Siao Sun,Binod Baniya,Qinghuan Zhang +8 more
TL;DR: A comprehensive spatiotemporal drought pattern analysis during the period of 1964-2015 over the Greater Horn of Africa showed that despite regional differences, an overall increasing tendency of drought was observed across the GHA over the past 52 yr.
Journal ArticleDOI
Spatio-temporal variations in climate, primary productivity and efficiency of water and carbon use of the land cover types in Sudan and Ethiopia.
TL;DR: Results of this study revealed that NPP, WUE and CUE of the different land cover types in Ethiopia have higher magnitudes than their counterparts in Sudan, and they exhibit higher sensitivity to drought and variation in precipitation.
Journal ArticleDOI
Modified Palmer Drought Severity Index: Model improvement and application.
TL;DR: The Modified Palmer Drought Severity Index (MPDSI) is proposed by considering agricultural irrigation such as irrigation quotas and soil water deficits and found that MPDSI can well monitor drought conditions in irrigated regions and can well lessen overestimation of drought conditions by PDSI.
Journal ArticleDOI
Spatio-temporal changes of the climatic water balance in Romania as a response to precipitation and reference evapotranspiration trends during 1961–2013
Remus Prăvălie,Adrian Piticar,Bogdan Roșca,Lucian Sfîcă,Georgeta Bandoc,Adrian Tiscovschi,Cristian Valeriu Patriche +6 more
TL;DR: In this article, the authors explored the spatio-temporal changes of the CWB (difference between P and reference evapotranspiration, ETo) in Romania, based on a wide range of climatic data (P, as well as temperature, relative air humidity, sunshine duration and wind speed, necessary for computing ETo with the FAO-56 Penman-Monteith method) recorded at 70 weather stations across the country in the 1961-2013 period.
References
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Climate change 2007: the physical science basis
Susan Solomon,Dahe Qin,Martin R. Manning,Melinda Marquis,Kristen Averyt,Melinda M.B. Tignor,H. L. Miller,Z. Chen +7 more
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.
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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.