Characterization of the Spatial and Temporal Distribution of Atmospheric CO2 Concentration With Altitude Based on the Carbon Tracker Model
Global warming caused by the increase of greenhouse gas(GHG)concentration in the atmosphere has become one of the most urgent and far-reaching global environmental problems in the 21st century.Accurate and comprehensive information on atmospheric CO2 concentration is important for studying the global carbon cycle,evaluating the effectiveness of CO2 emission reduction,and formulating emission reduction policies.In this study,the spatial and temporal distribution of atmospheric CO2 concentration with altitude based on Carbon Tracker CO2 product data,GOSAT near-surface CO2 concentration data,and TCCON data are analyzed by using linear trend a-nalysis,correlation analysis,etc.The results show that:①the spatial heterogeneity of atmospheric CO2 concentra-tion decreases with increasing altitude,and the characteristics of spatial distribution change with increasing alti-tude;②the average annual concentration and growth rate of atmospheric CO2 in the Northern Hemisphere and Central Asia decrease with increasing altitude,while the average annual concentration and growth rate of atmos-pheric CO2 in the other regions have the characteristics of decreasing,then increasing,and then decreasing with increasing altitude;③the interannual variations of atmospheric CO2 concentrations at all altitudes in the six re-gions are characterized by continuous growth and seasonal cycles,but the seasonal cycles become less pronounced with increasing altitude;④the atmospheric CO2 concentration over the ocean shows no significant daily variation,and the other five regions can only observe the daily variation near the ground.
Carbon Tracker modelcarbon dioxideglobal areaspatial and temporal variation
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