Changes in temperature extremes based on a 6-hourly dataset in China from 1961–2005 |
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| Authors: | Yichang Hu Yong He Wenjie Dong |
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| Institution: | [1]Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]National Climate Center, China Meteorological Administration, Beijing 100081 [3]State Key Laboratory of Earth Surface Processes and Ecology Resource, Beijing Normal University, Beijing 100875 [4]Graduate University of the Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | Changes in Chinese temperature extremes are presented based on a six-hourly surface air
temperature dataset for the period 1961--2005. These temperature series are manually observed at
0200, 0800, 1400, and 2000 Beijing Time (LST), and percentile based extreme indices of these time
series are chosen for analysis. Although there is a difference in time among the different time
zones across China, as more than 80% of the stations are located in two adjacent time zones,
these indices for all the stations are called warm (cold) nights (0200 LST), warm (cold) mornings
(0800 LST), warm (cold) days (1400 LST), and warm (cold) evenings (2000 LST), respectively for
convenience. The frequency of the annual warm extremes has generally increased, while the frequency
of the annual cold extremes has decreased, and significant changes are mainly observed in northern
China, the Tibetan Plateau, and the southernmost part of China. Based on the national average, annual
warm (cold) nights increase (decrease) at a rate of 5.66 (-5.92) d (10 yr)-1, annual warm (cold)
days increase (decrease) at a rate of 3.97 (-2.98) d (10 yr)-1, and the trends for the annual warm
(cold) mornings and evenings are 4.35 (-4.96) and 5.95 (-4.35) d (10 yr)-1, respectively. For
China as a whole, the increasing rates for the occurrence of seasonal warm extremes are larger in the
nighttime (0200, 2000 LST) than these in the daytime (0800, 1400 LST), the maximal increase occurs at
2000 LST except in the summer and the minimal increase occurs at 1400 LST except in autumn; the maximal
decrease in the occurrence of seasonal cold extremes occurs at 0200 LST and the minimal decrease occurs
at 1400 LST. |
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| Keywords: | temperature extreme frequency 6-hourly dataset |
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