GEOGRAPHICAL RESEARCH ›› 2010, Vol. 29 ›› Issue (3): 431-439.doi: 10.11821/yj2010030006

• Climate and Global Change • Previous Articles     Next Articles

Variation of bio-temperature indexes on the Tibetan Plateau in the past 40 years

ZHAO Dong-sheng1, WU Shao-hong1,2   

  1. 1. Institute of Geographic Sciences and Natural Resource Research, CAS, Beijing 100101, China;
    2. Institute of Tibetan Plateau Research, CAS, Beijing 100085, China
  • Received:2009-01-14 Revised:2009-04-21 Online:2010-03-20 Published:2010-03-20

Abstract:

The Tibetan Plateau is sensitive to climate change, and its detailed trend of climate change is highly interesting. Temperature change is a key content of climate change. Currently, more studies focused on statistical meaning of temperature change, but ignored its biological meaning. In this study, mean temperature of the warmest month (TWM), mean temperature of the coldest month (TCM), accumulated temperature of duration temperature ≥10℃(AT10), duration with mean daily temperature ≥10℃ (DT10), accumulated temperature of duration temperature ≥5℃ (AT5), duration with mean daily temperature ≥5℃ (DT5), accumulated temperature of duration temperature ≥0℃ (AT0) and duration with mean daily temperature ≥0℃ (DT0) were selected as representative bio-temperature indexes due to clear biological meaning, and their changing tendencies were analyzed based on observation data of 87 stations on the Tibetan Plateau during 1966-2005. The result indicated that TWM and TCM increased significantly with different velocities, and that also it slowed down with different variation tendencies on the spatial distribution. Even contrary variation tendency between TWM and TCM was found at some stations, but its significance level is lower. AT10, AT5 and AT0 were ascending with high significance level, with the largest increase in AT10, followed by AT5 and AT0. Differences with variation tendency of AT10, AT5 and AT0, DT5 had been greatly rising, followed by DT10 and DT0. As far as significance level was concerned, DT10 was the highest, followed by DT10 and DT0. In general, air temperature of the Tibetan Plateau is rising, which can affect ecological niche and eco-geographical boundary, and make structures and functions of ecosystem modified adaptive to temperature change.

Key words: the Tibetan Plateau, temperature changes, accumulated temperature, tendency analysis