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DOI	10.5194/acp-21-7217-2021
	Analysis of CO2 spatio-temporal variations in China using a weather-biosphere online coupled model
	Dong X.; Yue M.; Jiang Y.; Hu X.-M.; Ma Q.; Pu J.; Zhou G.
发表日期	2021
ISSN	1680-7316
起始页码	7217
结束页码	7233
卷号	21 期号:9
英文摘要	The dynamics of atmospheric CO2 has received considerable attention in the literature, yet significant uncertainties remain within the estimates of contribution from the terrestrial flux and the influence of atmospheric mixing. In this study we apply the WRF-Chem model configured with the Vegetation Photosynthesis and Respiration Model (VPRM) option for biomass fluxes in China to characterize the dynamics of CO2 in the atmosphere. The online coupled WRF-Chem model is able to simulate biosphere processes (photosynthetic uptake and ecosystem respiration) and meteorology in one coordinate system. We apply WRFChem for a multi-year simulation (2016-2018) with integrated data from a satellite product, flask samplings, and tower measurements to diagnose the spatio-temporal variations of CO2 fluxes and concentrations in China. We find that the spatial distribution of CO2 was dominated by anthropogenic emissions, while its seasonality (with maxima in April 15 ppmv higher than minima in August) was dominated by the terrestrial flux and background CO2. Observations and simulations revealed a consistent increasing trend in column-averaged CO2 (XCO2) of 2.46 ppmv (0.6 %yr-1) resulting from anthropogenic emission growth and biosphere uptake. WRF-Chem successfully reproduced ground-based measurements of surface CO2 concentration with a mean bias of-0.79 ppmv and satellite-derived XCO2 with a mean bias of 0.76 ppmv. The model-simulated seasonality was also consistent with observations, with correlation coefficients of 0.90 and 0.89 for ground-based measurements and satellite data, respectively. Tower observations from a background site at Lin'an (30.30° N, 119.75° E) revealed a strong correlation (-0.98) between vertical CO2 and temperature gradients, suggesting a significant influence of boundary layer thermal structure on the accumulation and depletion of atmospheric CO2. © 2021 Author(s).
语种	英语
scopus关键词	accumulation; anthropogenic source; atmospheric chemistry; boundary layer; concentration (composition); correlation; ground-based measurement; photosynthesis; spatiotemporal analysis; thermal structure; uncertainty analysis; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246898
作者单位	School of Atmospheric Science, Nanjing University, Nanjing, 210023, China; Joint International Research Laboratory of Atmospheric and Earth System Sciences, Institute for Climate and Global Change Research, Nanjing University, Nanjing, 210023, China; Zhejiang Meteorological Science Institute, Hangzhou, 310008, China; Zhejiang Lin'an Atmospheric Background National Observation and Research Station, Hangzhou, 311307, China; Center for Analysis and Prediction of Storms, University of Oklahoma, Norman, OK 73072, United States; Shanghai Key Laboratory of Health and Meteorology, Shanghai Meteorological Service, Shanghai, 200135, China
推荐引用方式 GB/T 7714	Dong X.,Yue M.,Jiang Y.,et al. Analysis of CO2 spatio-temporal variations in China using a weather-biosphere online coupled model[J],2021,21(9).
APA	Dong X..,Yue M..,Jiang Y..,Hu X.-M..,Ma Q..,...&Zhou G..(2021).Analysis of CO2 spatio-temporal variations in China using a weather-biosphere online coupled model.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(9).
MLA	Dong X.,et al."Analysis of CO2 spatio-temporal variations in China using a weather-biosphere online coupled model".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.9(2021).