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| Temporal and spatial distribution characteristics of lower troposphere carbon dioxide in Hefei Science Island |
| YANG Jie1,2, HU Shun-xing1, YUAN Ke-e1, SUN Pei-yu1,3, HUANG Jian1, WANG Yi-nan4 |
1. Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2. University of Science and Technology of China, Hefei 230026, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
4. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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Abstract Based on the carbon dioxide volume mixing ratio concentration profiles of Hefei Science Island from 2013 to 2016,the distribution characteristics of carbon dioxide in the subtropical monsoon climate and the characteristics of carbon dioxide source and sink in Hefei science island were analyzed from the night,season and year respectively.The concentration of carbon dioxide in the atmosphere decreased with the increase of altitude,the carbon dioxide concentration of 390m was about 95% that of 15m.The concentration of carbon dioxide gradually increased at night (about 5%),while there was a tendency to decrease at drawn.When the measurement height was more than 100m,the obvious seasonal change was shown,with the minimum in summer and the maximum in winter,which the difference in concentration of about 10×10-6.With a yearly growth rate of about 2.1648×10-6,the annual distribution of the concentration of carbon dioxide from 2013 to 2016 had no significant difference in the gradient change of the height above 100m,the correlation coefficient was above 0.9,and the volume mixing ratio concentration increased.Through data analysis from three different timescales,it could be concluded that the concentration of carbon dioxide near the ground was greatly influenced by the atmospheric environment.The seasonal distribution of carbon dioxide concentration was the result of a combination of atmospheric movement and the activities of plants and animals.In the process of long-term carbon dioxide cycling,there was a current that the near-surface carbon dioxide transported to a higher altitude.
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Received: 30 August 2017
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