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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Comparison of three drought indices and their evolutionary characteristics in the arid region of northwestern China
TL;DR: In this paper, the authors analyzed the evolution of dryness in the arid region of northwestern China from 1960 to 2010 based on the standardized precipitation index (SPI), standardized precipitation-evapotranspiration index, and the self-calibrated Palmer drought severity index (SC-PDSI).
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Increasing risk of meteorological drought in the Lake Urmia basin under climate change: Introducing the precipitation-temperature deciles index
TL;DR: In this paper, the authors proposed a novel framework to characterize such drought conditions based on the joint variability of precipitation-temperature, particularly under climate change, and applied the methodology is applied to the Lake Urmia basin located in a semi-arid region in the northwest of Iran.
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Monitoring the trends of aeolian desertified lands based on time-series remote sensing data in the Horqin Sandy Land, China
TL;DR: In this paper, the authors used the Sen's slope estimator and the Mann-Kendall statistical test to analyze the spatial trends of the ADI and selected climate factors to monitor the trends of aeolian desertification in Horqin Sandy Land by using time series MODIS-NDVI remote sensing data for the period of 2000-2013.
Journal ArticleDOI
Drought modeling using classic time series and hybrid wavelet-gene expression programming models
TL;DR: In this article, a hybrid wavelet and gene expression programming (GEP) model was proposed to model the SPEI at three different time scales (SPEI-3, SPEPI-6, and SPEP-12) from six meteorology stations located in Turkey.
Journal ArticleDOI
Changes in groundwater drought associated with anthropogenic warming
TL;DR: In the absence of long-term changes in precipitation deficits, they infer that the changing nature of groundwater droughts is due to changes in evapotranspiration associated with anthropogenic warming as mentioned in this paper.
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.
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.