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Spatial dependence of diurnal temperature range trends on precipitation from 1950 to 2004 |
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| Authors: | Liming Zhou Aiguo Dai Yongjiu Dai Russell S. Vose Cheng-Zhi Zou Yuhong Tian Haishan Chen |
| Affiliation: | 1. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA, 30332, USA 2. National Center for Atmospheric Research, P. O. 3000, Boulder, CO, 80307, USA 3. School of Geography, Beijing Normal University, 100875, Beijing, China 4. Climate Analysis Branch, National Climatic Data Center, Asheville, NC, 28801, USA 5. Office of Research and Applications, NOAA/NESDIS, Camp Springs, MD, 20746, USA 6. IMSG at NOAA/NESDIS, Camp Springs, MD, 20746, USA 7. Jiangsu Key Laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology, 210044, Nanjing, China |
| Abstract: | This paper analyzes the spatial dependence of annual diurnal temperature range (DTR) trends from 1950–2004 on the annual climatology of three variables: precipitation, cloud cover, and leaf area index (LAI), by classifying the global land into various climatic regions based on the climatological annual precipitation. The regional average trends for annual minimum temperature (T min) and DTR exhibit significant spatial correlations with the climatological values of these three variables, while such correlation for annual maximum temperature (T max) is very weak. In general, the magnitude of the downward trend of DTR and the warming trend of T min decreases with increasing precipitation amount, cloud cover, and LAI, i.e., with stronger DTR decreasing trends over drier regions. Such spatial dependence of T min and DTR trends on the climatological precipitation possibly reflects large-scale effects of increased global greenhouse gases and aerosols (and associated changes in cloudiness, soil moisture, and water vapor) during the later half of the twentieth century. |
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