Study of atmospheric CO2 and CH4 at Longfengshan WMO/GAW regional station: The variations, trends, influence of local sources/sinks, and transport

Fang, Shuangxi; Tans, Pieter P.; Yao, Bo; Luan, Tian; Wu, Yanling; Yu, Dajiang

doi:10.1007/s11430-016-9066-3

Cited by 26 publications

(11 citation statements)

References 35 publications

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“…The CO 2 values lower than the MBL are thought to be the absorption by land biosphere in June and July, while the higher values in September should be caused by anthropogenic emissions. The seasonal variations of CH 4 at the two sites present completely different trends with MBL, similar to some other stations like the Longfengshan in China (Fang et al, 2017). The largest difference is observed in summer with the bias of 42 ± 1.5 ppb at WLG and 48 ± 1.6 ppb at XGLL.…”

Section: Resultssupporting

confidence: 80%

Comparison of Atmospheric CO₂, CH₄, and CO at Two Stations in the Tibetan Plateau of China

Guo

Fang

Liu

et al. 2020

Earth and Space Science

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The research of greenhouse gases on the Tibetan Plateau is of great importance since its unique topography as the third pole of our planet and profound response on the climate change. In this study, we compared the concurrent observations of atmospheric carbon dioxide (CO 2 ), methane (CH 4 ), and carbon monoxide (CO) during 2010-2016 from two stations located on the Tibetan Plateau, which are Mt. Waliguan station (WLG), the only World Meteorological Organization/Global Atmosphere Watch global station in the inland of Eurasia, and Shangri-La station, a Chinese national station (XGLL). Although both stations are located at remote area, the atmospheric CO 2 , CH 4 , and CO concentrations are frequently influenced by regional sources, especially for XGLL throughout the year and WLG in summer. Due to the unique topography and regional conditions, the atmospheric CH 4 and CO at both stations display different trends with other sites in China, with higher values in summer. The atmospheric CO 2 , CH 4 , and CO at the XGLL mainly represent the conditions in regional scale. As the only World Meteorological Organization/Global Atmosphere Watch global station in the inland of Eurasia, the observation results at WLG can be used to represent the conditions on the Tibetan Plateau, but some of them are frequently influenced by the emissions from the cities located on the east or north east, and some even can be affect by emissions from the Ganges basin in autumn and winter, which should be treated with caution. By subtracting the influences of the cities, we updated the growth rate of 2.45 ± 0.02 ppm yr −1 for CO 2 , 8.2 ± 0.1 ppb yr −1 for CH 4 , and −0.4 ± 0.1 ppb yr −1 for CO, compared to the prior estimation of 2.31 ± 0.02 ppm yr −1 for CO 2 , 8.1 ± 0.1 ppb yr −1 for CH 4 , and −0.6 ± 0.1 ppb yr −1 for CO on the Tibetan Plateau.

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Section: Resultssupporting

confidence: 80%

Comparison of Atmospheric CO₂, CH₄, and CO at Two Stations in the Tibetan Plateau of China

Guo

Fang

Liu

et al. 2020

Earth and Space Science

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“…The Shangri‐La station, which is close to the WLG, showed a similar growth rate of 2.59 ± 1.0 ppm yr −1 during 2010–2014 (Fang, Tans, Dong, et al., 2016). The CO 2 growth rates were obviously higher at adjacent regional stations in China (3.7 ± 1.2 ppm yr −1 at Lin'an during 2009–2011 and 3.1 ± 0.02 ppm yr −1 at Longfengshan during 2009–2013), implying strong differences between city regions and remote areas (Fang et al., 2014, 2017). Regarding other remote stations in the world, Yuan et al.…”

Section: Resultsmentioning

confidence: 99%

Changes of Atmospheric CO₂ in the Tibetan Plateau From 1994 to 2019

Liu

Zhu

Huang³

et al. 2021

JGR Atmospheres

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The emission of greenhouse gases (GHGs) has increased rapidly since the pre-industrial era (1750 C.E.). The concentration of GHGs in the atmosphere has reached a historic level, inducing various unwanted phenomena, such as global warming, glacier melting, and extreme weather events (IPCC, 2014). Among the primary GHGs [water vapor, carbon dioxide (CO 2 ), methane, nitrous oxide, and ozone], CO 2 is the most important as it has strong infrared absorption and contributes ∼66% of the radiative forcing by long-lived GHGs (Stuiver & Quay, 1981). Currently, sources/sinks and biogeochemical cycling of CO 2 play an important role in global climate change, and their abundance is considered to further continue being a dominant factor for future climate change (Albritton et al., 2001;Li et al., 2014). According to the IPCC AR5 Synthesis Report, the global mean surface temperature in the late twenty-first century would be largely determined by the cumulative emission of CO 2 (IPCC, 2014). Ice core studies reveal that the atmospheric CO 2 mole fraction was only approximately 278 ppm around 1750 C.E.

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“…CO 2 (t), CH 4 (t) and CO (t)) is decomposed into an adjustment function f(t) and into a residual function R(t) (Equation 1). The function f(t) (Equation 2)includes a 2-degree polynomial p(t) representing the long term trend and a series of four harmonics that fit the seasonal cycle (Levin et al, 2002;Ramonet et al, 2002;Fang et al, 2017). The residual function R(t) that represents the synoptic variations, obtained by the difference between the hourly mean measurements and the fitted curve f(t) (Lin et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Analysis of the temporal variability of CO<sub>2</sub>, CH<sub>4</sub> and CO concentrations at Lamto, West Africa

Tiémoko

Ramonet

Yoroba

et al. 2021

Tellus B: Chemical and Physical Meteorology

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Study of atmospheric CO2 and CH4 at Longfengshan WMO/GAW regional station: The variations, trends, influence of local sources/sinks, and transport

Cited by 26 publications

References 35 publications

Comparison of Atmospheric CO₂, CH₄, and CO at Two Stations in the Tibetan Plateau of China

Comparison of Atmospheric CO₂, CH₄, and CO at Two Stations in the Tibetan Plateau of China

Changes of Atmospheric CO₂ in the Tibetan Plateau From 1994 to 2019

Analysis of the temporal variability of CO<sub>2</sub>, CH<sub>4</sub> and CO concentrations at Lamto, West Africa

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Study of atmospheric CO2 and CH4 at Longfengshan WMO/GAW regional station: The variations, trends, influence of local sources/sinks, and transport

Cited by 26 publications

References 35 publications

Comparison of Atmospheric CO2, CH4, and CO at Two Stations in the Tibetan Plateau of China

Comparison of Atmospheric CO2, CH4, and CO at Two Stations in the Tibetan Plateau of China

Changes of Atmospheric CO2 in the Tibetan Plateau From 1994 to 2019

Analysis of the temporal variability of CO<sub>2</sub>, CH<sub>4</sub> and CO concentrations at Lamto, West Africa

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Comparison of Atmospheric CO₂, CH₄, and CO at Two Stations in the Tibetan Plateau of China

Comparison of Atmospheric CO₂, CH₄, and CO at Two Stations in the Tibetan Plateau of China

Changes of Atmospheric CO₂ in the Tibetan Plateau From 1994 to 2019