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Estimating missing daily temperature extremes in Jaffna, Sri Lanka

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Abstract

The accuracy of reconstructing missing daily temperature extremes in the Jaffna climatological station, situated in the northern part of the dry zone of Sri Lanka, is presented. The adopted method utilizes standard departures of daily maximum and minimum temperature values at four neighbouring stations, Mannar, Anuradhapura, Puttalam and Trincomalee to estimate the standard departures of daily maximum and minimum temperatures at the target station, Jaffna. The daily maximum and minimum temperatures from 1966 to 1980 (15 years) were used to test the validity of the method. The accuracy of the estimation is higher for daily maximum temperature compared to daily minimum temperature. About 95% of the estimated daily maximum temperatures are within ±1.5 °C of the observed values. For daily minimum temperature, the percentage is about 92. By calculating the standard deviation of the difference in estimated and observed values, we have shown that the error in estimating the daily maximum and minimum temperatures is ±0.7 and ±0.9 °C, respectively. To obtain the best accuracy when estimating the missing daily temperature extremes, it is important to include Mannar which is the nearest station to the target station, Jaffna. We conclude from the analysis that the method can be applied successfully to reconstruct the missing daily temperature extremes in Jaffna where no data is available due to frequent disruptions caused by civil unrests and hostilities in the region during the period, 1984 to 2000.

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Acknowledgments

Financial support by Higher Education for the Twenty First Century (HETC) Project assisted by the World Bank (IDA Credit 49190-LK) is acknowledged.

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Authors and Affiliations

  1. Department of Physics, University of Jaffna, Jaffna, Sri Lanka

    A. Thevakaran

  2. Department of Physics, University of Colombo, Colombo, Sri Lanka

    D.U.J. Sonnadara

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  1. A. Thevakaran
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  2. D.U.J. Sonnadara
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Correspondence to D.U.J. Sonnadara.

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Thevakaran, A., Sonnadara, D. Estimating missing daily temperature extremes in Jaffna, Sri Lanka. Theor Appl Climatol 132, 145–152 (2018). https://doi.org/10.1007/s00704-017-2082-0

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  • DOI: https://doi.org/10.1007/s00704-017-2082-0

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