CO2作为最重要的温室气体,是造成全球温室效应的主要原因之一。利用GOSAT L4B 全球分布数据,分析全球及中国地区近地面CO2含量的时空分布特征。研究发现,北半球近地面CO2含量明显高于南半球,CO2年增长率约2 ppm。全球高值区主要出现在东亚、俄罗斯、欧洲和美国等人口众多、经济发达地区。北半球近地面CO2含量季节分布显示,冬季的CO2含量最高,夏季最低。中国区域近地面CO2含量在空间分布上较为集中,东西差异显著,总体呈东高西低的特征,高值区主要集中于中国华北和长三角地区。中国范围内近地面CO2含量具有明显的季节变化特征,月平均含量4 月(春季)升至最高值,为396.5ppm;7 月(夏季)降至最低值,为382.8ppm。
CO2 is the most important greenhouse gas and the main cause of the global warming. In this paper, GOSAT L4B data sets of CO2 concentrations near the ground are used for the analysis of the global and regional distributions of CO2. It is found that the ground CO2 concentration is significantly higher in the Northern Hemisphere than in the southern hemisphere. The yearly CO2 concentration growth rate is about 2 ppm. The global high-value areas are in places of large populations and developed economics in East Asia, Russia, Europe and the United States. In the Northern Hemisphere seasonal distributions of CO2 concentrations near the ground, the highest CO2 concentration appears in winter and the lowest in summer. CO2 concentration near ground in China has significantly high values in North China and the Yangtze River Delta region, with obvious seasonal variations, with the highest monthly average value of 396.5 ppm in April and the minimum value of 382.8 ppm in July.
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