The Greenhouse Gas Monitoring Instrument(GMI)onboard the Chinese hyperspectral satellite GF5-02 can provide abundant observations of global atmospheric CO_(2),which plays an important role in climate research.CO_(2)re...The Greenhouse Gas Monitoring Instrument(GMI)onboard the Chinese hyperspectral satellite GF5-02 can provide abundant observations of global atmospheric CO_(2),which plays an important role in climate research.CO_(2)retrieval precision is the key to determining the application value of the GMI.To reduce the influence of atmospheric scattering on retrieval,we combined the Directional Polarimetric Camera(DPC)data on the same satellite to improve the anti-interference ability of GMI CO_(2)retrieval and ensure its retrieval precision.To realize the reliability and feasibility of the collaborative use of the GMI and DPC,this paper designs the pointing registration method of the GMI based on coastline observations,the spatial resolution matching method and the collaborative cloud screening method of the GMI and DPC observations.Combined with the DPC,which supplied the spectral data and aerosol product,the retrieval ability of the coupled bidirectional reflectance distribution function CO_(2)retrieval(CBCR)method developed for GMI CO_(2)retrieval was improved,with the retrieval efficiency of CO_(2)products increasing by 27%,and the CO_(2)retrieval precision increasing from 3.3 ppm to 2.7 ppm.Moreover,collaborative use not only guaranteed the GMI’s ability to detect global and area CO_(2)concentration distribution characteristics,such as significant concentration differences between the Northern and Southern Hemispheres in winter and high CO_(2)concentrations in urban agglomeration areas caused by human activities,but also extended the GMI’s potential for monitoring anomalous events,such as the Tonga volcanic eruption.展开更多
基金funded by National Key R&D Program of China[Grant No.2021YFE0118000]Key Research Program of the Chinese Academy of Sciences[Grant No.ZDRW-KT-2020-3]and Dragon 5 cooperation.
文摘The Greenhouse Gas Monitoring Instrument(GMI)onboard the Chinese hyperspectral satellite GF5-02 can provide abundant observations of global atmospheric CO_(2),which plays an important role in climate research.CO_(2)retrieval precision is the key to determining the application value of the GMI.To reduce the influence of atmospheric scattering on retrieval,we combined the Directional Polarimetric Camera(DPC)data on the same satellite to improve the anti-interference ability of GMI CO_(2)retrieval and ensure its retrieval precision.To realize the reliability and feasibility of the collaborative use of the GMI and DPC,this paper designs the pointing registration method of the GMI based on coastline observations,the spatial resolution matching method and the collaborative cloud screening method of the GMI and DPC observations.Combined with the DPC,which supplied the spectral data and aerosol product,the retrieval ability of the coupled bidirectional reflectance distribution function CO_(2)retrieval(CBCR)method developed for GMI CO_(2)retrieval was improved,with the retrieval efficiency of CO_(2)products increasing by 27%,and the CO_(2)retrieval precision increasing from 3.3 ppm to 2.7 ppm.Moreover,collaborative use not only guaranteed the GMI’s ability to detect global and area CO_(2)concentration distribution characteristics,such as significant concentration differences between the Northern and Southern Hemispheres in winter and high CO_(2)concentrations in urban agglomeration areas caused by human activities,but also extended the GMI’s potential for monitoring anomalous events,such as the Tonga volcanic eruption.
