科研之友
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摘要
In order to detect daily temperature trend in eastern China, observed daily temperature data spanning over 32 years (1979-2010) including daily maximum temperature (T-max), minimum temperature (T-min) and mean temperature (T-avg) were analysed. Besides, land cover conversions in grassland/cropland around 102 meteorological stations were also investigated to explore the sensitivity of temperature to grassland/cropland. Increasing trends were detected in observed T-max and T-min, with distinct connection to the distribution of grassland/cropland. T-max changed greatly in grassland and T-min in cropland. Besides, unique seasonal and spatial variability was discovered in T-max and T-min, respectively. Finally, percentile-based temperature indices derived from observed daily temperature data were further involved to demonstrate the sensitivity of temperature extremes to grassland/cropland, which showed that the annual occurrences of warm day, summer heat wave and winter warm night events were increasing, while those of cold night were decreasing. Analysis of thresholds that distinguished summer heat wave and winter warm night events suggested higher temperature in grassland.
- 出版日期2015-6-15
- 单位北京大学
