Warm nights and cool nights

The average number of warm nights in China increased with a rate of 3 day/10a during 1951-1999 (Zhai and Pan, 2003a). Prior to the mid-1980s, there were about 10-20 warm nights per year, compared with 20-40 warm nights per year after the mid-1980s (Figure 8.4). Most China exhibited significant upward trends in warm nights, with the largest increases in parts of southwest China.

Cool nights in China displayed a decreasing trend by about 3 day/10a (Zhai and Pan, 2003a). This rate is more obvious since the mid-1970s (Figure 8.4). Over most regions of the country, cool nights decreased significantly, northern China has greater declines than that in southern China.

The decreasing trends in cold nights are much greater than that in cold days, which is consistent with those of many other countries in SE Asian areas (Alexander et al., 2006) and it also supports the fact that the increase of nighttime temperature is quicker than that of daytime temperature.

Fig. 8.4 China's averaged numbers of warm nights (dash lines) and cool nights (solid lines) during 1951-1999. (Zhai and Pan, 2003a)
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