Key Laboratory of Coast and Island Development of Ministry of Education, School of Geography and Ocean Science, Nanjing University, Nanjing, China.
Key Laboratory of Coast and Island Development of Ministry of Education, School of Geography and Ocean Science, Nanjing University, Nanjing, China.
Sci Total Environ. 2022 Jul 15;830:154711. doi: 10.1016/j.scitotenv.2022.154711. Epub 2022 Mar 23.
Combustion-derived water vapor (CDV) has significant impacts on urban climate and environment. However, temporal variations of contribution of CDV (CCDV) to urban humidity are unclear due to lack of observations. This study examined the temporal variations of CCDV in Xi'an during winter from 2016 to 2019. We found that the diurnal variation of CCDV is mainly controlled by atmospheric stability, but the peak of CCDV at 9 am is due to the increasing water vapor emission by motor vehicles during the morning rush hour. In addition, the monthly variation of CCDV is related to fossil fuel consumption, but the low values of CCDV in late January and early February is due to substantial decrease of energy utility because of the massive outflow of population during the Spring Festival. Our findings may be helpful for urban pollution control because CDV can play an important role in the secondary conversion of pollutants.
燃烧产生的水汽（CDV）对城市气候和环境有重大影响。但是，由于缺乏观测，CDV 对城市湿度的贡献的时间变化尚不清楚。本研究考察了 2016 年至 2019 年冬季西安的 CCDV 的时间变化。我们发现，CCDV 的日变化主要受大气稳定性控制，但上午 9 时 CCDV 的峰值是由于早高峰期间机动车水蒸气排放量的增加。此外，CCDV 的月变化与化石燃料消耗有关，但 1 月下旬和 2 月初 CCDV 值较低是由于春节期间大量人口外流导致能源使用量大幅减少。我们的研究结果可能有助于城市污染控制，因为 CDV 可以在污染物的二次转化中发挥重要作用。
