首页|Characteristics Variation of Atmospheric CO2 and CH4 in Yongxing Island,South China Sea
Characteristics Variation of Atmospheric CO2 and CH4 in Yongxing Island,South China Sea
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Using the observation data in Yongxing Island,South China Sea(SCS)from December 2013 to November 2018,the multiple time scales variation of atmospheric CO2 and CH4 were analyzed to understand their temporal variation characteristics and controlling factors.The regional-averaged background mole fractions of CO2 and CH4 both show a single-period sinusoidal variation with a lower value at noon and a higher value in the wee hours.In the seasonal scale,they exhibited a significant sea-sonal difference with higher values in winter and lower values in summer.In the annual scale,CO2 and CH4 both show an increas-ing trend,with an annual growth rate of approximately 3.2ppm and 12ppb,respectively.The annual growth rate at this site was higher than the global average.The change in atmospheric CO2 and CH4 in Yongxing Island was probably caused by the higher emission of the surrounding areas and the airflows driven by monsoon.Hopefully,the long-term and high-resolution greenhouse gases(GHGs)dataset will aid relevent researchers and decision-makers in performing more in-depth studies for GHG sources in order to derive effective strategies.
carbon dioxidemethaneobservationbackward trajectoryatmospheric transport
LV Honggang、JIANG Yifei、WANG Haiyan
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Key Laboratory of Marine Hazards Forecasting,National Marine Environmental Forecasting Center,Ministry of Natural Resources(MNR),Beijing 100081,China
National Marine Environmental Forecasting Center,Beijing 100081,China
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