Changes in exceptional hydrological and meteorological weekly event frequencies in Greece
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The aim of the present study is, primarily, to compare the frequencies of exceptional hydrological and meteorological weekly events, employing the self-calibrated versions of Palmer’s drought indices (PDSI and PHDI, respectively), from 17 stations across Greece in the decade 1997–2006 with these of 1961–1990; on second level, to identify the trends and define the time lags between these two indices for the study period 1961–2006. The changes in the spatial distribution of exceptional weekly event frequencies between the most recent decade and the baseline period were similar for both drought indices. When 1997–2006 was compared with 1961–1990, the number of stations with a frequency of exceptionally dry weekly events >93rd percentile, increased by seven stations (41%) for PDSI and nine (53%) for PHDI, at the expense of exceptionally moist weekly spells. PDSI was found to lead PHDI by three to 20 weeks. If exceptional weekly events continue to be more frequent in the future, major implications for natural water resources are expected.
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- Alcamo J et al (2007) Climate change 2007: impacts, adaptation and vulnerability. In: Parry ML et al (eds) Contribution of Working group II to the fourth assessment report of the Intergovernmental Panel of Climate Change. Cambridge University Press, Cambridge, pp 541–580Google Scholar
- American Meteorology Society (1997) Meteorological drought—policy statement. Bull Am Meteorol Soc 78:847–849Google Scholar
- Heim RR (2002) A review of twentieth-century drought indices used in the United States. Bull Am Meteorol Soc 83:1149–1165Google Scholar
- Keyantash J, Dracup JA (2002) The quantification of drought: an evaluation of drought indices. Bull Am Meteorol Soc 83:1167–1180Google Scholar
- Levene H (1960) Robust tests for equality of variances. In: Contributions to probability and statistics: essays in honor of Harold Hotelling. Stanford University Press, Stanford, pp 278–292Google Scholar
- Mitchell JM, Dzerdzeevskii B, Flohn H, Hofmeyr WL, Lamb HH, Rao KN, Wallén CC (1966) Climatic change. In: WMO technical note no 79. World Meteorological Organization, p 79Google Scholar
- Palmer WC (1965) Meteorological drought. U.S. Weather Bureau Research Paper 45, pp 58 (Available from NOAA Library and Information Services Division, Washington, DC)Google Scholar
- Philandras CM, Nastos PT, Repapis CC (2008) Air temperature variability and trends over Greece. Global Nest J 10:273–285Google Scholar
- Wilhite DA (2000) Drought as a natural hazard: concepts and definitions. In: Wilhite DA (ed) Drought a global assessment. Routledge, London, pp 3–18Google Scholar