The effect of ENSO on temperature changes in winter in Tehran province

Authors

1 Expert of the Meteorological Organization of the country

2 PhD of meteorology, Forecasting Center/I.R. of Iran Meteorological Organization

3 PhD. Candidate of Meteorology, Forecasting Center/I.R. of Iran Meteorological Organization

Abstract

Climate change and global warming are some of the most important environmental issues, in addition to direct socioeconomic impacts on human health and well-being and there has been a lot of research in recent years. Enso (Southern Oscillation- El Nino) is recognized as one of the most prominent Causes of Variability on the global scale of year-to-year. ENSO affects both in the tropical Pacific and around the world. In this study, the effect of ENSO on the trend of temperature changes in Tehran province is investigated in the 19 years of winter (2000-2018). To calculate the effect of ENSO on temperature, the analysis of extreme events and the elimination of the effect of other telecommunications, in particular, the Arctic Ocean and the North Atlantic Oscillation, the daily temperature anomalies are calculated relative to the seasonal long-term average, and then Butterworth filter is used. Daily air temperature data at 2 m height were used for 10 meteorological stations in Tehran province and the monthly ENSO index. The results show that the temperature variance relative to the long-term average in Lanina and El Nino conditions is about 8 and 15, respectively. Also, the effect of Lanina and El Nino on the temperature fluctuations is relatively low. In Lannina and El Nino's condition, these fluctuations are regular and irregular respectively; So that, the temperature fluctuated to about 8 in February.

Keywords

References

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History

  • Receive Date: 29 April 2020
  • Accept Date: 29 April 2020
  • First Publish Date: 29 April 2020

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