Trends in temperature (maximum and minimum), diurnal temperature range over Anand (middle Gujarat): A case study
Temperature and DTR trends over Anand, Gujarat
DOI:
https://doi.org/10.21921/jas.v12i04.15261Keywords:
Temperature, Diurnal temperature range, Trend, Mann-Kendall test, Sen’s slopeAbstract
Attempts have been made to study the temporal variations and trends in monthly, seasonal and annual temperature over Anand (middle Gujarat). Analysis has been carried for four temperature indices, namely - minimum temperature (Tmin), maximum temperature (Tmax), mean temperature (Tmean) and diurnal temperature range (DTR). Non-parametric Mann-Kendall (MK) test was used to detect the trends and the magnitude of the trends were determined with Sen’s estimator of slope. The analysis of the temperature data revealed significant increasing trends in Tmin, Tmax and Tmean variables at the station on annual scale, while decreasing trend in DTR was significant over Anand only. All the Tmean values also show increasing trends a significant decreasing trend in January over Anand (0.01089 °C/year). The increasing trends in Tmean are statistically significant from March to May at Anand. Similar to Tmin index, the trends in Tmean are also largest in December. The increase in Tmean has been detected during the period of study at Anand respectively. At Anand station, the statistically significant fall in DTR are observed in the January. During the period of study, Anand witnessed a fall of 1.7 °C and 1.5 °C in DTR values in the month of December and January respectively. Monthly DTR values between Februarys to November months are mainly non- significant decreasing (increasing) over Anand.
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