Resources Science ›› 2017, Vol. 39 ›› Issue (5): 954-963.doi: 10.18402/resci.2017.05.15

• Orginal Article • Previous Articles     Next Articles

The characteristics of extreme minimum temperature events and exposure of farmland in China

Anqian WANG1,4(), Buda SU1,2,3(), Yanjun WANG2, Guojie WANG2, Jinlong HUANG1,4, Chengyi ZHAO1   

  1. 1. State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China
    2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster,School of Geography and Remote Sensing,Nanjing University of Information Science & Technology,Nanjing 210044,China
    3. National Climate Center,China Meteorological Administration,Beijing 100081,China
    4. University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2016-11-10 Revised:2017-01-09 Online:2017-05-20 Published:2017-05-20

Abstract:

Based on daily minimum temperature data from 543 meteorological stations from 1960 to 2014,characteristics of extreme minimum temperature events over China were analyzed. By taking the spatial and temporal continuity characteristics of extreme minimum temperature events into account,the Intensity-Area-Duration(IAD)method was applied to assess the relationship between intensity and coverage of extreme minimum temperature events at different durations and evaluate the area of farmland exposed to extreme minimum temperature events. We found that the areas where single-site extreme minimum temperature events occur more frequently are located in the northern and northeastern regions and that most events last 1~2 days. In northwestern and southeastern areas,where extreme minimum temperature events are comparatively lesser,most events last longer (last 3~5 days,or more than six days). Coverage of extreme minimum temperature events has decreased from the 1960s to 1990s,and increased in the 21st century. The coverage of extreme minimum temperature events was lowest in the 1990s for different durations. Before the 21st century,regional extreme minimum temperature events were of short duration but greater area and intensity. Since the beginning of the 21st century,both the coverage and intensity of extreme minimum temperature events has decreased,but the duration has increased. The area of farmland exposed to extreme minimum temperature events increased before 1969,but then decreased. The maximum and minimum farmland area exposed to extreme minimum temperature events was in 1969 and 2007 respectively. Farmland area exposed to extreme minimum temperature events has stabilized since the beginning of the 21st century.

Key words: extreme minimum temperature events, IAD method, exposure of farmland, China