| Autor: |
Nelson, R. R., Cusworth, D. H., Thorpe, A. K., Kim, J., Elder, C. D., Nassar, R., Mastrogiacomo, J.‐P. |
| Zdroj: |
Geophysical Research Letters; 12/16/2024, Vol. 51 Issue 23, p1-11, 11p |
| Abstrakt: |
Carbon dioxide (CO2 ${\mathrm{C}\mathrm{O}}_{2}$) emissions from combustion sources are uncertain in many places across the globe. Here, we estimate CO2 ${\mathrm{C}\mathrm{O}}_{2}$ emission rates from a small number of collocated observations from the Orbiting Carbon Observatory‐3 (OCO‐3) and the Earth Surface Mineral Dust Source Investigation (EMIT), both onboard the International Space Station (ISS). These near‐simultaneous measurements allow for an unprecedented comparison of two unique space‐based CO2 ${\mathrm{C}\mathrm{O}}_{2}$ sensors over both isolated coal‐fired power plants and multi‐source scenes in China. We estimate CO2 ${\mathrm{C}\mathrm{O}}_{2}$ emission rates using integrated mass enhancement and a Gaussian plume model. Where validation data is available, 15 of the 19 estimated emission rates have errors less than 37%. For the multi‐source scenes, EMIT can estimate emissions from individual facilities but its aggregate emissions are 42% lower than OCO‐3, likely because it cannot detect small sources or diffuse emissions. OCO‐3, with its excellent precision, may better constrain CO2 ${\mathrm{C}\mathrm{O}}_{2}$ emissions over the entire scene. Plain Language Summary: We do not know exactly how much carbon dioxide is emitted from combustion point sources, like power plants that burn coal, in many places across the globe. Satellites orbiting Earth can detect these carbon dioxide emissions, but research is needed to better understand and improve this capability. In this work, we use measurements taken at about the same time from the Orbiting Carbon Observatory‐3 (OCO‐3) instrument and the Earth Surface Mineral Dust Source Investigation (EMIT) instrument, both onboard the International Space Station (ISS), to estimate how much carbon dioxide is emitted from a small number of power plants. For power plants where we know how much carbon dioxide they emit, both OCO‐3 and EMIT can accurately measure the rate of carbon dioxide emission, if we average enough data together. For a small region in northwest China that has 11 power plants, EMIT can estimate emission rates from individual power plants but OCO‐3 may be better able to estimate the total amount of carbon dioxide emitted over the entire scene. Key Points: Near‐simultaneous observations of CO2 point sources from OCO‐3 and EMIT allow for a comparison of emission rate estimates from both sensorsEMIT's high spatial resolution allows it to estimate CO2 emission rates from individual facilities within a multi‐source sceneOCO‐3's excellent precision allows it to constrain total CO2 emissions from multi‐source scenes [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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