| 摘要: |
| 利用红外CO2分析仪对西安市雁塔区南二环西段CO2浓度进行昼夜观测，研究大气CO2昼夜动态规律及其影响因素。监测结果显示，CO2浓度昼夜变化可分为2∶00—6∶00，8∶00—12∶00，14∶00—20∶00，22∶00—24∶00四个阶段。7月份四个阶段的浓度依次为较高→最高→最低→较低，呈现出双峰模态；10月份为浓度较低→较高→最低→最高，呈现出极不对称双峰模态。7月与10月CO2浓度的周内与周末变化规律有相似之处，同时也存在差异。在80 m高度范围内，白天CO2浓度均随着高度的增加而降低，夜间CO2在高度上的变化不稳定，且10月份CO2浓度明显高于7月份。温度影响CO2浓度变化，但在不同月份，温度的影响存在明显差异。CO2浓度变化主要与植物的光合作用有关。季节变化和植被比人类活动对CO2浓度变化的影响更大。 |
| 关键词: CO2浓度 昼夜变化 周内与周末 高度 温度 |
| DOI：10.7515/JEE201304004 |
| CSTR： |
| 分类号:X831 |
基金项目:国家科技支撑计划(2007BAC30B01)
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| Changes of atmospheric carbon dioxide concentration in warm season in Xi′an |
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BAI Xiao-juan1, ZHAO Jing-bo1,2
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1.College of Tourism and Environment, Shaanxi Normal University, Xi′an 710062, China; 2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi′an 710075, China
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| Abstract: |
| Using the infrared analyzer of carbon dioxide, we get data of carbon dioxide concentration through the diurnal observation in south central of Xi′an. Atmospheric carbon dioxide diurnal dynamics and its influence factors were studied. The monitoring results showed that diurnal variation of carbon dioxide concentration can be divided into four stages: 2∶00—6∶00, 8∶00—12∶00, 14∶00—20∶00, 22∶00—24∶00. The four stages in July are the higher stage, the highest stage, the lowest stage and the lower stage, respectively, and showed bimodal mode. The four stages in October are the lower stage, the higher stage, the lowest stage and the highest stage, respectively, and showed asymmetric bimodal mode. The changes of carbon dioxide concentration on weekdays and weekend in July and October have similar aspects, also some differences. Within height of 80 meters, the carbon dioxide concentration decreases as altitude increases in daytime, but unstable at night. Atmospheric carbon dioxide concentration in October is higher than that in July. Temperature affects variations of carbon dioxide concentration. There are obvious differences in the effect of temperature in different months. Variations of carbon dioxide concentration mainly related to the photosynthesis of plants. The impact of seasonal variation and vegetation are huger than human activities on variations of carbon dioxide concentration. |
| Key words: carbon dioxide concentration diurnal variation weekday and weekend height temperature |
