Observed and simulated features of the CO2 diurnal cycle in the boundary layer at Beijing and Hefei, China

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 varia- tions in CO2 concentration based on observations and modeling have been studied widely. However, few studies have focused on the pattern of...

Full description

Saved in:
Bibliographic Details
Published inChinese science bulletin Vol. 59; no. 14; pp. 1529 - 1535
Main Authors Wang, Yinan, Lü, Daren, Li, Qian, Duan, Minzheng, Hu, Fei, Hu, Shunxing
Format Journal Article
LanguageEnglish
Published Heidelberg Science China Press 01.05.2014
Subjects
Chemistry/Food Science
CO2浓度
Earth Sciences
Engineering
Humanities and Social Sciences
Life Sciences
multidisciplinary
Physics
Science
Science (multidisciplinary)
北京
合肥
周期
地球观测系统
昼夜
模拟功能
边界层
concentration
Urban traffic emissions
diurnal cycle
CO
GEOS-Chem
Boundary layer
Online AccessGet full text

Cover

More Information
Summary: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 varia- tions 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 concen- tration 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, dueto 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 Bei- jing 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 signifi- cantly enhanced the CO2 concentration in the boundary layer.
Bibliography:11-1785/N
CO2 diurnal cycle ; CO2 concentrationGEOS-Chem ; Boundary layer ; Urban trafficemissions
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 varia- tions 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 concen- tration 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, dueto 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 Bei- jing 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 signifi- cantly enhanced the CO2 concentration in the boundary layer.
ISSN:1001-6538
1861-9541
DOI:10.1007/s11434-014-0194-9