气候变化领域集成服务门户(CCPortal): A study on background concentration and source-sink characteristics of CO2 in south of Jiangsu [苏南地区CO2本底浓度及源汇特征]

CCPortal

	A study on background concentration and source-sink characteristics of CO2 in south of Jiangsu [苏南地区CO2本底浓度及源汇特征]
	Wei F.-F.; Lin H.-J.; Cao S.-Y.; Shen P.-F.; Hui P.-H.
发表日期	2020
ISSN	10006923
起始页码	975
结束页码	982
卷号	40 期号:3
英文摘要	By quality control methods (i.e., time series inspection, selection of stability data and eliminating the abnormal values), high-quality CO2 datasets of Zhangjiagang Station in Suzhou from 2015 to 2018 were obtained to study the background concentration and source-sink characteristics of CO2 in Suzhou. By Moving Average Filtering (MAF) method, CO2 datasets have been separated as background and non-background data. The background data showed that the diurnal variation of CO2 background concentration showed a single peak structure, and the peak and valley value was around 5:00 a.m. and 15:00 p.m, respectively. The seasonal variation showed a double peak structure, with the peaks in December and April. Both of the distribution of daily and seasonal variation of CO2 were related to terrestrial ecosystems, meteorological conditions and human activities. From 2015 to 2018, the CO2 concentration has increased. Particularly, the proportion of rising concentration has significantly increased, which may due to the human activities. On the contrast, the variation of the absorption concentration was stable, which inferred that the role of terrestrial ecosystem on CO2 concentration was relatively stable. The source-sink analysis showed that, seasonally, the CO2 uplifting concentration fluctuated slightly, while the absorption concentration showed remarkable seasonally variations. The diurnal variation of the rising concentration was a single-peak structure, with the peak value around 8:00 a.m., which may be traced to the high motor vehicle emissions in the morning. The absorption concentration was low in the daytime and high in the nighttime, which may be related to the plant photosynthesis and convective transport. We further analyzed the relationship between the CO2 concentration and the wind field. The high CO2 concentration has prevailed under the condition of calm wind in all seasons. Generally, in most wind directions, the concentration of CO2 was negatively correlated with the wind speed. Particularly, the high CO2 concentration was mostly accompanied at south to west-northwest winds. This may due to that the inland urban agglomeration was mainly located in southwest to northwest direction, and the construction area around the station was mainly located in southwest to north direction. Consequently, weak winds would lead to cumulative local emissions. However, the concentration of CO2 was high at west-northwest winds. This may due to that the building area and inland urban agglomeration was in the west to north direction of the station. As the wind blew eastward, the concentration was low even when the wind is small, because the air from the sea is relatively clean. Moreover, the farmland and forest areas were mainly located in the east of the station, which was less affected by human activities. Our results have suggested that the concentration of CO2 was not only related to the wind speed, but also related to the type of underlying surface and the long-distance environmental characteristics. © 2020, Editorial Board of China Environmental Science. All right reserved.
英文关键词	Greenhouse gases; Source-sink characteristics; Urban background; Wind filed
scopus关键词	Agglomeration; Ecosystems; Inspection; Wind; Background concentration; Convective transport; Double peak structure; Environmental characteristic; Meteorological condition; Motor vehicle emissions; Terrestrial ecosystems; Urban agglomerations; Carbon dioxide
来源期刊	Zhongguo Huanjing Kexue/China Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176948
作者单位	Suzhou Meteorological Bureau, Suzhou, 215131, China; Jiangsu Climate Center, Nanjing, 210009, China
推荐引用方式 GB/T 7714	Wei F.-F.,Lin H.-J.,Cao S.-Y.,等. A study on background concentration and source-sink characteristics of CO2 in south of Jiangsu [苏南地区CO2本底浓度及源汇特征][J],2020,40(3).
APA	Wei F.-F.,Lin H.-J.,Cao S.-Y.,Shen P.-F.,&Hui P.-H..(2020).A study on background concentration and source-sink characteristics of CO2 in south of Jiangsu [苏南地区CO2本底浓度及源汇特征].Zhongguo Huanjing Kexue/China Environmental Science,40(3).
MLA	Wei F.-F.,et al."A study on background concentration and source-sink characteristics of CO2 in south of Jiangsu [苏南地区CO2本底浓度及源汇特征]".Zhongguo Huanjing Kexue/China Environmental Science 40.3(2020).