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
High-resolution spatio-temporal analyses of drought episodes in the western Mediterranean basin (Spanish mainland, Iberian Peninsula)
José Carlos González-Hidalgo,S. M. Vicente-Serrano,Dhais Peña-Angulo,Celia Salinas,Miquel Tomas-Burguera,Santiago Beguería +5 more
TL;DR: In this paper, the authors identify major drought events on the Spanish mainland between 1961 and 2014 by means of two drought indices, and analyze the spatial propagation of drought conditions, using the daily meteorological data from Spanish Meteorological Archives (AEMet).
Journal ArticleDOI
Effects of climate warming on Sphagnum photosynthesis in peatlands depend on peat moisture and species-specific anatomical traits.
Vincent E. J. Jassey,Vincent E. J. Jassey,Vincent E. J. Jassey,Constant Signarbieux,Constant Signarbieux,Constant Signarbieux +5 more
TL;DR: It is shown that the effect of climate warming on Sphagnum community photosynthesis toggles from positive to negative as the peatland goes from rainy to dry periods during summer, confirming the transitory nature of warming-induced photosynthesis benefits in boreal systems and highlighting the vulnerability of the ecosystem to excess warming and drying.
Journal ArticleDOI
Cumulative Drought Stress Leads to a Loss of Growth Resilience and Explains Higher Mortality in Planted than in Naturally Regenerated Pinus pinaster Stands
Rafael M. Navarro-Cerrillo,Carlos Rodriguez-Vallejo,Emidio Silveiro,Antonio Hortal,Guillermo Palacios-Rodríguez,Joaquín Duque-Lazo,J. Julio Camarero +6 more
TL;DR: A negative and significant relationship between mean temperature for May and June of the current year and growth in the naturally regenerated stands was found and a loss of growth resilience, specifically a negative trend after successive droughts was shown.
Journal ArticleDOI
Drought-induced increase in water-use efficiency reduces secondary tree growth and tracheid wall thickness in a Mediterranean conifer
José Miguel Olano,Juan Carlos Linares,Ana I. García-Cervigón,Alberto Arzac,Antonio Delgado,Vicente Rozas +5 more
TL;DR: The results are consistent with a drought-induced limitation of tree growth response to rising CO2, despite the trend of rising iWUE being maintained, and remark the usefulness of exploring this relationship at different temporal scales to fully understand the actual links between iW UE and secondary growth dynamics.
Journal ArticleDOI
Choice of potential evapotranspiration formulas influences drought assessment: A case study in China
Jian Zhou,Yanjun Wang,Buda Su,Buda Su,Anqian Wang,Hui Tao,Jianqing Zhai,Zbigniew W. Kundzewicz,Zbigniew W. Kundzewicz,Tong Jiang,Tong Jiang +10 more
TL;DR: In this paper, a set of models was used to assess the spatial and temporal distributions of droughts for the arid, the semi-arid and semi-humid, as well as the humid climatic zones in China for 1961-2017.
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.
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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.