On the basis of daily air temperature data from 47 meteorological stations in the northern and southern regions of the Qinling Mountains (QLM) from 1951 to 2009, the variations of several criteria for temperature zones were analyzed including the mean annual temperature, the number of days with steady temperature above 10 ℃ and its accumulated temperature, the minimum temperature, mean temperatures during the coldest and hottest seasons. Our results show that climate warming in both northern and southern QLM was mainly observed after the 1990s, and the trends of mean annual temperature were consistent with the number of days with steady temperature above 10 ℃ and the accumulated temperature. Although these three indices showed a slight decline from 1951 to 1993 and a rapid increase since 1993, some seasonal and regional differences do exist. The average temperature of cold seasons of January exhibited the same changing trends with the minimum temperature, since they both slightly increased from 1951 to 1985 and declined since 1985. Meanwhile, the average temperature of hot seasons of July showed no significant trends. In addition, the increment of some indices showed differences among the northern areas to the QLM, southern slope of QLM, Hanshui River Basin and valleys in Daba and Wushan mountains. Compared with the period before 1993, the number of days with accumulated temperature steadily above 10 ℃ increased by 10, 10, 8 and 5 in the above four regions after 1993, accompanied by increments of related accumulated temperature by 278 ℃, 251 ℃, 235 ℃ and 207 ℃ respectively. Although the increment of thermal resources in the northern region of QLM had larger extent than that in the southern region, their variation trends were consistent and more marked in the cold season. Thus, the Qinling Mountains are still a boundary between the warm temperate zone and sub-tropical zone in China under the background of climate warming since the 1990s.
ZHOU Qi, BIAN Juanjuan, ZHENG Jingyun
. Variation of Air Temperature and Thermal Resources in the Northern and Southern Regions of the Qinling Mountains from 1951 to 2009[J]. Acta Geographica Sinica, 2011
, 66(9)
: 1211
-1218
.
DOI: 10.11821/xb201109006
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