| Radiation balance and the response of albedo to environmental factors above two alpine ecosystems in the eastern Tibetan Plateau |
| |
| 作者姓名： | ShaoYing Wang Yu Zhang ShiHua Lyu LunYu Shang YouQi Su HanHui Zhu |
| |
| 基金项目： | This work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 91537106, 41405016, 41275016, 91537104, and 41605011). |
| |
| 摘 要： | Understanding the energy balance on the Tibetan Plateau is important for better prediction of global climate change. To characterize the energy balance on the Plateau, we examined the radiation balance and the response of albedo to environmental factors above an alpine meadow and an alpine wetland surfaces in the eastern Tibetan Plateau, using 2014 data. Although our two sites belong to the same climatic background, and are close geographically, the annual incident solar radiation at the alpine meadow site(6,447 MJ/(m2·a)) was about 1.1 times that at the alpine wetland site(6,012 MJ/(m2·a)),due to differences in the cloudiness between our two sites. The alpine meadow and the alpine wetland emitted about 38%and 42%, respectively, of annual incident solar radiation back into atmosphere in the form of net longwave radiation; and they reflected about 22% and 18%, respectively, of the annual incident solar radiation back into atmosphere in the form of shortwave radiation. The annual net radiation was 2,648 and 2,544 MJ/(m2·a) for the alpine meadow site and the alpine wetland site, respectively, accounting for only about 40% of the annual incident solar radiation, significantly lower than the global mean. At 30-min scales, surface albedo exponentially decreases with the increase of the solar elevation angle; and it linearly decreases with the increase of soil-water content for our two sites. But those relationships are significantly influenced by cloudiness and are site-specific.
|
| 收稿时间： | 2016/11/23 0:00:00 |
| 修稿时间： | 2017/1/20 0:00:00 |
Radiation balance and the response of albedo to environmental factors above two alpine ecosystems in the eastern Tibetan Plateau |
| |
| ShaoYing Wang,Yu Zhang,ShiHua Lyu,LunYu Shang,YouQi Su,HanHui Zhu.Radiation balance and the response of albedo to environmental factors above two alpine ecosystems in the eastern Tibetan Plateau[J].Sciences in Cold and Arid Regions,2017,9(2):142-150. |
| |
| Institution: | Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gausu 730000, China;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gausu 730000, China;College of Atmospheric Sciences, Chendu University of Information T;College of Atmospheric Sciences, Chendu University of Information Technology, Chengdu, Sichuan 610225, China;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gausu 730000, China;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gausu 730000, China;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gausu 730000, China |
| |
| Abstract: | Understanding the energy balance on the Tibetan Plateau is important for better prediction of global climate change. To characterize the energy balance on the Plateau, we examined the radiation balance and the response of albedo to environmental factors above an alpine meadow and an alpine wetland surfaces in the eastern Tibetan Plateau, using 2014 data. Although our two sites belong to the same climatic background, and are close geographically, the annual incident solar radiation at the alpine meadow site (6,447 MJ/(m2·a)) was about 1.1 times that at the alpine wetland site (6,012 MJ/(m2·a)), due to differences in the cloudiness between our two sites. The alpine meadow and the alpine wetland emitted about 38% and 42%, respectively, of annual incident solar radiation back into atmosphere in the form of net longwave radiation; and they reflected about 22% and 18%, respectively, of the annual incident solar radiation back into atmosphere in the form of shortwave radiation. The annual net radiation was 2,648 and 2,544 MJ/(m2·a) for the alpine meadow site and the alpine wetland site, respectively, accounting for only about 40% of the annual incident solar radiation, significantly lower than the global mean. At 30-min scales, surface albedo exponentially decreases with the increase of the solar elevation angle; and it linearly decreases with the increase of soil-water content for our two sites. But those relationships are significantly influenced by cloudiness and are site-specific. |
| |
| Keywords: | Tibetan Plateau radiation balance surface albedo solar elevation angle soil water content |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《寒旱区科学》浏览原始摘要信息 |
| 点击此处可从《寒旱区科学》下载免费的PDF全文 |
|
