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Combining the standardized precipitation index and climatic water deficit in characterizing droughts: a case study in Romania

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Abstract

This paper characterizes droughts in Romania using the approach of both the standardized precipitation index (SPI) and climatic water deficit (WD). The values of the main climatic factors (rainfall, temperature, reference evapotranspiration, etc.) were obtained from 192 weather stations in various regions of Romania. Penman–Monteith reference evapotranspiration (ETo-PM) was used to calculate WD as the difference between precipitation (P) and ETo-PM. SPI was calculated from precipitation values. There is a clear difference between drought and aridity. Drought occurrence determines higher WD values for plains and plateaus and lower climatic excess water (EW) values for high mountains in Romania, depending on the aridity of the specific region considered and drought severity. WD calculated as mean values for both normal conditions and, for all locations studied, various types of drought was correlated with mean annual precipitation and temperature, respectively. The combined approach of WD and SPI was mainly carried out for periods of 1 year, but such studies could also be done for shorter periods like months, quarters, or growing season. The most arid regions did not necessarily coincide with areas of the most severe drought, as there were no correlations between WD and SPI and no altitude-based SPI zones around the Carpathian Mountains, as is the case for other climate characteristics, soils and vegetation. Water resource problems arise where both SPI values characterize extremely droughty periods and WD values are greatly below −200 mm/year. This combined use of SPI and WD characterizes the dryness of a region better than one factor alone and should be used for better management of water in agriculture in Romania and also other countries with similar climate characteristics.

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Acknowledgements

This paper partly resulted from the AGRAL-116 Project, coordinated by Dr. Andrei Canarache from the Research Institute for Soil Science and Agrochemistry (Bucharest, Romania) and financed by the Ministry of Education and Research from Romania. We thank both to the coordinator and the financing authority, and also to the National Drought Mitigation Center, University of Nebraska-Lincoln, which offered the software computing the SPI, and Prof. Dr. John Catt from the Department of Geography, University College London for his useful comments and suggestions which helped improve the shape and content of this paper.

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Authors and Affiliations

  1. Research Institute for Fruit Growing, Pitesti-Maracineni, Marului Str., no. 402, Pitesti Box Office 73, Postal Office 1, Arges district, Romania

    Cr. Paltineanu & Nicola Claudia

  2. Ovidius University, Faculty of Geography, B-dul Mamaia, no. 124, Constanta, Romania

    I. F. Mihailescu & Zoia Prefac

  3. Institute of Geography of the Romanian Academy, Str. Dimitrie Racovita, no. 12, sector 2, Bucharest, Romania

    Carmen Dragota

  4. National Meteorological Administration, Bucharest, Soseaua Bucuresti-Ploiesti, no. 97, Romania

    Felicia Vasenciuc

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  1. Cr. Paltineanu
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  2. I. F. Mihailescu
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  3. Zoia Prefac
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  4. Carmen Dragota
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  5. Felicia Vasenciuc
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  6. Nicola Claudia
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Correspondence to Cr. Paltineanu.

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Paltineanu, C., Mihailescu, I.F., Prefac, Z. et al. Combining the standardized precipitation index and climatic water deficit in characterizing droughts: a case study in Romania. Theor Appl Climatol 97, 219–233 (2009). https://doi.org/10.1007/s00704-008-0061-1

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