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Outline
This study systematically analyzes and compares the spatiotemporal coverage and distribution patterns of the Level-2 atmospheric column CO2 concentration (XCO2) products from OCO-3, OCO-2, and GOSAT satellites over China. The results showed that the annual average spatial coverage of the Level-2 XCO2 products in China were 43.38%, 21.19% and 0.40% for OCO-3, OCO-2, and GOSAT, respectively, with corresponding monthly average coverages were 4.77%, 2.43% and 0.16%. Notably, OCO-3 exhibited a significant lower monthly average coverage in odd-numbered months (2.23%) compared to even-numbered months (7.31%). There were significant spatial distribution differences in the coverage of the three satellite products. The coverage of OCO-2 and OCO-3 in southern and central China was significantly lower than that in northeastern, northwestern and northern China. In contrast, GOSAT's observations were extremely sparse, mainly concentrated in eastern China. In addition, OCO-3 identified over 20 hotspot observation areas over provincial capitals and industrial cities, which showed markedly higher coverage and observation frequency. From 2019 to 2022, all three satellite XCO2 products reveal consistent increasing trends in annual average XCO2, albeit with declining annual increment. Seasonal pattern showed consistently higher XCO2 in spring and winter than in summer and autumn. Spatially, annual average XCO2 showed higher concentrations in the eastern than western China, and in southern than northern China. However, the location of XCO2 extreme value varied across satellites, and significant differences in XCO2 concentrations were observed among different products within the same sub-region.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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