11:30 〜 11:45
[AAS07-10] Validation of EarthCARE Multi-Spectral Imager (MSI) cloud products using AHI aboard Himawari-9 geostationary satellite
キーワード：EarthCARE、多波長イメージャ (MSI)、雲、ひまわり9号
The Earth Cloud Aerosol and Radiation Explorer (EarthCARE) is a Japanese-European collaborative earth observation mission, successfully launched in May 2024. The mission is to elucidate the effects of clouds and aerosols on the Earth's climate system and radiation budget. The assessment of radiative forcing of clouds and aerosols is a major uncertainty in climate change projections with climate models. The EarthCARE satellite uses four instruments: the Cloud Profiling Radar (CPR), the Atmospheric Lidar (ATLID), the Multi-Spectral Imager (MSI), and the Broadband Radiometer (BBR), to globally observe cloud and aerosol distribution, vertical structure, and radiation flux at the top of atmosphere. The accumulation of these data will contribute to the accuracy of cloud and aerosol reproduction in climate and weather forecast models.
MSI is one of the instruments which has been developed by the European Space Agency (ESA) and measures horizontal characteristics of clouds and aerosols with 1 visible band (0.67μm), 1 near infrared (NIR) band (0.865μm), 2 shortwave infrared (SWIR) bands (1.65μm and 2.21μm), and 3 thermal infrared (TIR) bands (8.80μm, 10.8μm, and 12.0μm). The spatial resolution of each band is 500m and the swath width is 150km. The swath width has 384 pixels including some dummy pixels for each side, and nadir is not located at the center of the swath width to avoid sunglint on sea surface. JAXA MSI level 2 cloud products (MSI_CLP), including cloud flag and cloud phase, are provided by the Cloud and Aerosol Unbiased Decision Intellectual Algorithm (CLAUDIA), and cloud optical thickness, cloud particle effective radius, cloud top temperature, and cloud top height are provided by the Comprehensive Analysis Program for Cloud Optical Measurements (CAPCOM) (Wang et al.,2023; Nakajima et al., 2019).
Intercomparison for quantitative validation of the MSI products was implemented with level 1 product and cloud products from the imager aboard Himawari-9 satellite. Himawari-9 is a geostationary meteorological satellite launched in November 2016 and operated by the Japan Meteorological Agency (JMA). Advanced Himawari Imager (AHI) aboard Himawari-9 has several wavelength bands similar to those of MSI, with horizontal resolution of 500m for visible (0.64μm), 1km for NIR (0.86μm), and 2km for SWIR (1.6μm and 2.3μm) and TIR (8.6μm, 10.4μm, and 12.4μm). This presentation shows the intercomparison result of cloud products between EarthCARE/MSI and Himawari/AHI.
The L1 comparison result showed a tendency for MSI to be slightly excessive than that of AHI, especially at visible and NIR bands. On the other hand, thermal infrared bands seem to be matched with great precision. This tendency also seems to affect L2 result, especially in cloud optical thickness.
Additionally, the comparison results with the latest versions of L1 and L2 also will be explained in our presentation.
MSI is one of the instruments which has been developed by the European Space Agency (ESA) and measures horizontal characteristics of clouds and aerosols with 1 visible band (0.67μm), 1 near infrared (NIR) band (0.865μm), 2 shortwave infrared (SWIR) bands (1.65μm and 2.21μm), and 3 thermal infrared (TIR) bands (8.80μm, 10.8μm, and 12.0μm). The spatial resolution of each band is 500m and the swath width is 150km. The swath width has 384 pixels including some dummy pixels for each side, and nadir is not located at the center of the swath width to avoid sunglint on sea surface. JAXA MSI level 2 cloud products (MSI_CLP), including cloud flag and cloud phase, are provided by the Cloud and Aerosol Unbiased Decision Intellectual Algorithm (CLAUDIA), and cloud optical thickness, cloud particle effective radius, cloud top temperature, and cloud top height are provided by the Comprehensive Analysis Program for Cloud Optical Measurements (CAPCOM) (Wang et al.,2023; Nakajima et al., 2019).
Intercomparison for quantitative validation of the MSI products was implemented with level 1 product and cloud products from the imager aboard Himawari-9 satellite. Himawari-9 is a geostationary meteorological satellite launched in November 2016 and operated by the Japan Meteorological Agency (JMA). Advanced Himawari Imager (AHI) aboard Himawari-9 has several wavelength bands similar to those of MSI, with horizontal resolution of 500m for visible (0.64μm), 1km for NIR (0.86μm), and 2km for SWIR (1.6μm and 2.3μm) and TIR (8.6μm, 10.4μm, and 12.4μm). This presentation shows the intercomparison result of cloud products between EarthCARE/MSI and Himawari/AHI.
The L1 comparison result showed a tendency for MSI to be slightly excessive than that of AHI, especially at visible and NIR bands. On the other hand, thermal infrared bands seem to be matched with great precision. This tendency also seems to affect L2 result, especially in cloud optical thickness.
Additionally, the comparison results with the latest versions of L1 and L2 also will be explained in our presentation.