气候变化领域集成服务门户(CCPortal): The climatology of ambient CO2 concentrations from long-term observation in the Pearl River Delta region of China: Roles of anthropogenic and biogenic processes

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DOI	10.1016/j.atmosenv.2021.118266
	The climatology of ambient CO2 concentrations from long-term observation in the Pearl River Delta region of China: Roles of anthropogenic and biogenic processes
	Mai B.; Deng X.; Liu X.; Li T.; Guo J.; Ma Q.
发表日期	2021
ISSN	13522310
卷号	251
英文摘要	The global/regional background CO2 has been investigated extensively. However, the monitoring of CO2 concentration remains sparse in the megacities of China. Understanding the ambient CO2 in urban areas and how it is influenced by meteorological conditions, anthropogenic emissions, and biogenic processes may shed light on improving the carbon evaluation. The climatology of ambient CO2 is reported for the period 2014–2017 at the Guangzhou Panyu Atmospheric Composition Site (GPACS), a suburban site in the Pearl River Delta (PRD) region of China. The ambient CO2 ranged from 420.50 ± 14.87 × 10−6 mol mol−1 (ppm) in the summer to 431.94 ± 15.13 ppm in the winter and had an annual mean of 428.16 ± 16.26 ppm. The high CO2 concentrations during the winter were a consequence of anthropogenic emissions and low solar radiation against mixing layer height (MLH). The diurnal variability of CO2 exhibited two peaks: one peak occurring at 0500–0700 and another at 2100–2200 LST (Local Standard Time), which roughly corresponds to local rush hour. CO2 decreased with near-surface wind speed (WS), most of which was constrained to WS less than 2.0 ms−1. Carbon monoxide (CO) concentrations were simultaneously measured to distinguish between biogenic and anthropogenic sources of CO2. △CO2 and △CO showed significant, positive correlations (r = 0.77–0.78, p < 0.001) in winter and autumn, reflecting common sources under synoptic air transport from the northwest and northeast directions. The correlation was lower in spring (r = 0.62, p < 0.001), possibly because the vegetation photosynthesis was stronger. A regression analysis of △CO2 against △CO showed that the intercepts varied between 4.3 and 10.3 ppm, indicating that respiration released more CO2 relative to photosynthesis. The mean diurnal slope (△CO2/△CO) ranged from 54.27 ± 5.36 to 71.07 ± 10.30 ppm ppm−1, indicating that the anthropogenic sources were the largest contributor to CO2 compared to biogenic processes. The fossil fuels from power and industries are responsible for the level of anthropogenic CO2, while vehicles are the main source of diurnal variations. The ratio of △CO2 to △CO was lower in winter, which indicates the contribution of CO emissions from traffic sources were associated with the lower ambient temperature. More fossil fuel combustion to heat buildings together with reduced biospheric respiration can also explain the lower △CO2/△CO ratios during the winter. © 2021 The Authors
英文关键词	Anthropogenic sources; CO2 concentration; Photosynthesis; Respiration
scopus关键词	Atmospheric composition; Carbon monoxide; Climatology; Fossil fuels; Photosynthesis; Wind; Anthropogenic emissions; Anthropogenic sources; Diurnal variability; Fossil fuel combustion; Long term observations; Meteorological condition; Pearl River Delta region; Positive correlations; Carbon dioxide; air quality; carbon dioxide; concentration (composition); correlation; fossil fuel; photosynthesis; pollutant transport; regression analysis; solar radiation; wind velocity; China; Guangdong; Guangzhou; Panyu; Zhujiang Delta
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177198
作者单位	Institute of Tropical and Marine Meteorology, China Meteorological Administration (CMA), Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China; Guangzhou Meteorological Observatory, Guangzhou, China; Guangdong Ecological Meteorological Center, Guangzhou, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Linan Air Background StationZhejiang, China
推荐引用方式 GB/T 7714	Mai B.,Deng X.,Liu X.,et al. The climatology of ambient CO2 concentrations from long-term observation in the Pearl River Delta region of China: Roles of anthropogenic and biogenic processes[J],2021,251.
APA	Mai B.,Deng X.,Liu X.,Li T.,Guo J.,&Ma Q..(2021).The climatology of ambient CO2 concentrations from long-term observation in the Pearl River Delta region of China: Roles of anthropogenic and biogenic processes.Atmospheric Environment,251.
MLA	Mai B.,et al."The climatology of ambient CO2 concentrations from long-term observation in the Pearl River Delta region of China: Roles of anthropogenic and biogenic processes".Atmospheric Environment 251(2021).