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Spatial and temporal variation in daily temperature indices in summer and winter seasons over India (1969-2012)

机译:印度夏季和冬季的每日温度指数的时空变化(1969-2012年)

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摘要

Spatial and temporal variations in summer and winter extreme temperature indices are studied by using daily maximum and minimum temperatures data from 227 surface meteorological stations well distributed over India for the period 1969-2012. For this purpose, time series for six extreme temperature indices namely, hot days (HD), very hot days (VHD), extremely hot days (EHD), cold nights (CN), very cold nights (VCN), and extremely cold nights (ECN) are calculated for all the stations. In addition, time series for mean extreme temperature indices of summer and winter seasons are also analyzed. Study reveals high variability in spatial distribution of threshold temperatures of extreme temperature indices over the country. In general, increasing trends are observed in summer hot days indices and decreasing trends in winter cold night indices over most parts of the country. The results obtained in this study indicate warming in summer maximum and winter minimum temperatures over India. Averaged over India, trends in summer hot days indices HD, VHD, and EHD are significantly increasing (+1.0, +0.64, and +0.32 days/decade, respectively) and winter cold night indices CN, VCN, and ECN are significantly decreasing (-0.93, -0.47, and -0.15 days/decade, respectively). Also, it is observed that the impact of extreme temperature is higher along the west coast for summer and east coast for winter.
机译:通过使用1969-2012年印度分布良好的227个地面气象站的每日最高和最低温度数据,研究了夏季和冬季极端温度指数的时空变化。为此,针对六个极端温度指数的时间序列,即炎热的天气(HD),非常炎热的天气(VHD),非常炎热的天气(EHD),寒冷的夜晚(CN),非常寒冷的夜晚(VCN)和非常寒冷的夜晚(ECN)为所有电台计算。此外,还分析了夏季和冬季的平均极端温度指数的时间序列。研究表明,全国极端温度指数的阈值温度在空间分布上存在很大差异。一般而言,在美国大部分地区,夏季炎热天气指数呈上升趋势,而冬季寒冷夜间指数呈下降趋势。这项研究获得的结果表明印度夏季最高和冬季最低温度变暖。在印度平均水平,夏季高温日指数HD,VHD和EHD的趋势显着增加(分别为+ 1.0,+ 0.64和+0.32天/十年),而冬季寒冷的夜晚指数CN,VCN和ECN则显着下降( -0.93,-0.47和-0.15天/十天)。另外,观察到极端温度的影响在夏天的西海岸和冬天的东海岸都较高。

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  • 来源
    《Theoretical and applied climatology》 |2017年第4期|1227-1239|共13页
  • 作者单位

    Indian Meteorol Dept, Lodhi Rd, New Delhi 110003, India;

    Indian Meteorol Dept, Pune 411005, Maharashtra, India;

    Indian Meteorol Dept, Lodhi Rd, New Delhi 110003, India;

    Indian Meteorol Dept, Pune 411005, Maharashtra, India;

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