Observed and simulated features of the CO2 diurnal cycle in the boundary layer at Beijing and Hefei, China
Observed and simulated features of the CO2 diurnal cycle in the boundary layer at Beijing and Hefei, China
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北京和合肥边界层CO2日循环的观测和模拟特征
DOI：
10.1007/s11434-014-0194-9
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发表时间：
2014-05-01
影响因子：
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通讯作者：
Hu, Shunxing
中科院分区：
文献类型：
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作者：
Wang, Yinan;Lu, Daren;Hu, Shunxing
CO2日循环机制是研究碳收支及其对气候和环境变化影响的基础。基于观测和模拟的区域CO2浓度日变化已被广泛研究。然而，很少有研究集中在中国的CO2日循环的格局。利用戈达德地球观测系统（GEOS）-Chem三维全球化学输送模式，模拟了2004 - 2012年中国上空CO2浓度及其变化。同时，利用LI-COR 7500 A红外气体分析仪，对北京（39°58′N，116°22′E）和合肥（31°55′N，117°10′E）两个涡度相关通量观测塔观测到的CO2浓度进行了分析。观测结果表明，合肥地区的CO2日变化幅度大于北京地区，这是由于合肥地区的生态活动较强。GEOS-Chem成功地捕获了在北京和合肥观测到的边界层中CO2浓度日循环的主要方面。然而，模型和观测之间确实存在一些差异;具体而言，模型往往低估了CO2日周期的幅度。数据还表明，交通排放显着提高了边界层中的CO2浓度。
The mechanism of the CO2 diurnal cycle is a basis for investigating the carbon budget and its impacts on climate and environment change. Regional diurnal variations in CO2 concentration based on observations and modeling have been studied widely. However, few studies have focused on the pattern of the CO2 diurnal cycle in China. In this study, a three-dimensional global chemical transport model, Goddard Earth Observing System (GEOS)-Chem, was applied to simulate the CO2 concentration and its variation over China from 2004 to 2012. Meanwhile, we also analyzed the CO2 concentration as observed by two eddy covariance flux observation towers, one located in Beijing (39°58′N, 116°22′E) and one in Hefei (31°55′N, 117°10′E), using LI-COR 7500A infrared gas analyzers. Observations showed the amplitude of the CO2 diurnal cycle at Hefei to be larger than at Beijing, due to stronger ecological activities. GEOS-Chem successfully captured the main aspects of the diurnal cycle of the CO2 concentration in the boundary layer observed at both Beijing and Hefei. However, some discrepancies between the model and observations did exist; specifically, the model tended to underestimate the amplitude of the CO2 diurnal cycle. The data also showed that traffic emissions significantly enhanced the CO2 concentration in the boundary layer.