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Variations and trends in annual and seasonal means of precipitable water in Greece as deduced from radiosonde measurements
Toxicological and Environmental Chemistry (2001)
  • N. Chrysoulakis
  • M. Proedrou, Agricultural University of Athens
  • C. Cartalis, University of Athens
Abstract
Precipitable water (W), defined as the total amount of water vapor in the zenith direction between the surface of the earth and the top of the atmosphere, is a critical variable for climate studies. Variations and trends of precipitable water values time series at Hellinicon Station (37 54' N, 23 44' E) in Athens, Greece are examined (00:00 UTC and 12:00 UTC radiosondes) for the time period 1967–1995. Time series were examined using regression analysis and the Mann-Kendall Rank Statistic Test. For 00:00 UTC, an annual downward trend is detected for the period 1977–1995; in addition 1977 is the approximate year, according to the sequential version of the Mann-Kendall Rank Statistic, when the decrease of the annual and seasonal mean precipitable water starts. For 12:00 UTC no statistically significant annual trend is detected, whereas a statistically significant downward trend for winter, spring and summer for the period 1977–1983, 1976–1982 and 1976–1985 respectively is recognized.
Keywords
  • Precipitable water,
  • Time series,
  • Annual and seasonal variation,
  • Statistical analysis
Publication Date
2001
Citation Information
Chrysoulakis, Ν., Proedrou, M. and C. Cartalis, 2001. Variations and trends in annual and seasonal means of precipitable water in Greece as deduced from radiosonde measurements. Toxicological and Environmental Chemistry, 84, 1 - 6.