FTIR遥测大气中CO_2浓度变化及研究其影响因素

Measurement of CO_2 Using an Open-Path FTIR and the Factor of Influence

通过FTIR遥测北京空气中CO2浓度的变化,发现北京秋季白天CO2浓度的升高主要是由于机动车尾气的排放所引起的。CO2在白天由于光合作用和对流传输,浓度相对较低,浓度值为410μg.mL-1左右。而晚上则由于土壤和生物呼吸以及工业生产等产生的CO2在近地层大气中积累,CO2浓度值偏高,为610μg.mL-1左右。温度越高,CO2的浓度越低,而风速越小,公路边的CO2浓度越高。CO2浓度变化还受到湿度、风速等其他天气条件的影响。

In the remote-sensing experiments of CO2 in Beijng, the authors found that the higher concentration of COz in autumn is caused by the CO2 emission by the traffic sector during the day time. During the day time, the concentratration of COz is comparatively lower because of the photochemistry and the transportation of troposphere. And the concentration of CO2 is about 410 μg·mL^-1. At night the fossil fuel power plants will be taken as a model for the source of CO2, so the concentration of CO2 is about 610 μg·mL ^-1 or higher. The carbon increment from increased photosynthesis is greater than the increment in ecosystem carbon stocks. The higher the temperature, the lower the CO2 concentration. And the lower the rate of wind, the higher the concentration of CO2 also. Besides, the concentration of CO2 is affected by some other weather factors.