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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Temperature Vegetation Precipitation Dryness Index (TVPDI)-based dryness-wetness monitoring in China
TL;DR: In this article, a new Remote Sensing (RS) dryness index, called the Temperature Vegetation Precipitation Dryness Index (TVPDI), was defined and developed using the Euclidean distance method and three-dimensional (3D) P-Normalized Difference Vegetation Index (NDVI)-LST.
Journal ArticleDOI
Temporal Hydrological Drought Index Forecasting for New South Wales, Australia Using Machine Learning Approaches
TL;DR: In this article, an Artificial Neural Network (ANN) and Support Vector Regression (SVR) were used to predict the temporal aspect of the Standard Precipitation Evaporation Index (SPEI) for the New South Wales region of Australia.
Journal ArticleDOI
Meteorological drought analysis using copula theory and drought indicators under climate change scenarios (RCP)
Tayyebeh Mesbahzadeh,Maryam Mirakbari,Mohsen Mohseni Saravi,Farshad Soleimani Sardoo,Farshad Soleimani Sardoo,Mario Marcello Miglietta +5 more
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Spatiotemporal Patterns of Agricultural Drought in Sri Lanka: 1881-2010
TL;DR: A spatiotemporal analysis of two well-known agricultural drought indices, the Palmer Drought Severity Index (PDSI) and the Standardized Precipitation Index at a 9-month scale (SPI-9), is presented for Sri Lanka.
Journal ArticleDOI
Quantitative risk assessment of the effects of drought on extreme temperature in eastern China
TL;DR: In this paper, a copula-based model is proposed to construct the joint probability distribution of extreme temperature and drought based on 6-month Standardized Precipitation Index (SPI6).
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.