GOSAT TANSO FTS and CAI full archive and new products

The TANSO-FTS instrument on-board GOSAT satellite features high optical throughput, fine spectral resolution, and a wide spectral coverage (from VIS to TIR in four bands). The reflective radiative energy is covered by the VIS and SWIR (Shortwave Infrared) ranges, while the emissive portion of radiation from Earth's surface and the atmosphere is covered by the MWIR (Midwave Infrared) and TIR (Thermal Infrared) ranges. These spectra include the absorption lines of greenhouse gases such as carbon dioxide (CO2) and methane (CH4). The TANSO-CAI instrument on-board GOSAT satellite is a radiometer in the spectral ranges of ultraviolet (UV), visible, and SWIR to correct cloud and aerosol interference. The imager has continuous spatial coverage, a wider field of view, and higher spatial resolution than the FTS in order to detect the aerosol spatial distribution and cloud coverage. Using the multispectral bands, the spectral characteristics of the aerosol scattering can be retrieved together with optical thickness. In addition, the UV-band range observations provide the aerosol data over land. With the FTS spectra, imager data, and the retrieval algorithm to remove cloud and aerosol contamination, the column density of the gases can be the column density of the gases can be retrieved with an accuracy of 1%. The full ESA archive and newly acquired/systematically processed GOSAT FTS and CAI products are available in the following processing levels: - FTS Observation mode 1 L1B, day (FTS_OB1D_1) - FTS Observation mode 1 L1B, night (FTS_OB1N_1) - FTS Special Observation L1B, day (FTS_SPOD_1) - FTS Special Observation L1B, night (FTS_SPON_1) - FTS L2 CO2 profile, TIR (FTS_P01T_2) - FTS L2 CH4 profile, TIR (FTS_P02T_2) - FTS L2 CH4 column amount, SWIR (FTS_C02S_2) - FTS L2 CO2 column amount, SWIR (FTS_C01S_2) - FTS L2 H2O column amount, SWIR (FTS_C03S_2) - FTS L3 global CO2 distribution, SWIR (FTS_C01S_3) - FTS L3 global CH4 distribution, SWIR (FTS_C02S_3) - FTS L4A global CO2 flux, annual in text format (FTS_F01M4A) - FTS L4A global CO2 flux, annual in netCDF format (FTS_F03M4A) - FTS L4A global CO2 distribution (FTS_P01M4B) - FTS L4A global CH4 flux, annual in text format (FTS_F02M4A) - FTS L4A global CH4 flux, annual in netCDF format (FTS_F04M4A) - FTS L4A global CH4 distribution (FTS_P02M4B) - CAI L1B data (CAI_TRB0_1) - CAI L1B+ (CAI_TRBP_1) - CAI L2 cloud flag (CAI_CLDM_2) - CAI L3 global reflect. distrib. clear sky (CAI_TRCF_3) - CAI L3 global radiance distrib. all pixels (CAI_TRCL_3) - CAI L3 global NDVI (CAI_NDVI_3) All products are made available as soon as processed and received from JAXA. To satisfy NearRealTime requirements, ESA also provides access to the FTS L1X products, which are the NRT version of FTS L1B products. The main difference between L1X and L1B is that L1X does not include CAM data, best-estimate pointing-location, and target point classification, but most of all the L1X products are available on the ESA server between 2 and 5 hours after acquisition. The L1X products remains on the FTP server for 5 days, the time for the corresponding L1B to be available. A document describing the differences between L1X and L1B products is listed in the available resources. For more details on products, please refer to below product specifications.

搭载于GOSAT卫星的TANSO-FTS仪器具备高光学透过率、精细光谱分辨率以及宽光谱覆盖范围（从可见光至热红外波段，共四波段）。该仪器涵盖了反射辐射能的可见光和短波红外波段，以及地球表面和大气辐射的发射部分的中波红外和热红外波段。这些光谱包含了温室气体如二氧化碳（CO2）和甲烷（CH4）的吸收线。GOSAT卫星上的TANSO-CAI仪器是一种紫外、可见光和短波红外波段范围内的辐射计，用于校正云和气溶胶的干扰。该成像仪具有连续的空间覆盖、更宽的视场和比FTS更高的空间分辨率，以便检测气溶胶的空间分布和云覆盖。利用多光谱波段，可以同时获取气溶胶散射的光谱特性和光学厚度。此外，紫外波段范围的观测提供了陆地的气溶胶数据。通过FTS光谱、成像仪数据和去除云和气溶胶污染的检索算法，可以以1%的精度检索出气体的柱浓度。完整的ESA档案以及新获取的/系统处理的GOSAT FTS和CAI产品可在以下处理级别获得：- FTS观测模式1 L1B，白天（FTS_OB1D_1）- FTS观测模式1 L1B，夜间（FTS_OB1N_1）- FTS特殊观测L1B，白天（FTS_SPOD_1）- FTS特殊观测L1B，夜间（FTS_SPON_1）- FTS L2 CO2轮廓，热红外（FTS_P01T_2）- FTS L2 CH4轮廓，热红外（FTS_P02T_2）- FTS L2 CH4柱量，短波红外（FTS_C02S_2）- FTS L2 CO2柱量，短波红外（FTS_C01S_2）- FTS L2 H2O柱量，短波红外（FTS_C03S_2）- FTS L3全球CO2分布，短波红外（FTS_C01S_3）- FTS L3全球CH4分布，短波红外（FTS_C02S_3）- FTS L4A全球CO2通量，年度文本格式（FTS_F01M4A）- FTS L4A全球CO2通量，年度netCDF格式（FTS_F03M4A）- FTS L4A全球CO2分布（FTS_P01M4B）- FTS L4A全球CH4通量，年度文本格式（FTS_F02M4A）- FTS L4A全球CH4通量，年度netCDF格式（FTS_F04M4A）- FTS L4A全球CH4分布（FTS_P02M4B）- CAI L1B数据（CAI_TRB0_1）- CAI L1B+（CAI_TRBP_1）- CAI L2云标志（CAI_CLDM_2）- CAI L3全球反射分布，晴空（CAI_TRCF_3）- CAI L3全球辐射分布，所有像素（CAI_TRCL_3）- CAI L3全球NDVI（CAI_NDVI_3）。所有产品在处理并接收自JAXA后立即提供。为满足近实时要求，ESA还提供对FTS L1X产品的访问，它是FTS L1B产品的实时版本。L1X与L1B的主要区别在于L1X不包含CAM数据、最佳估计指向位置和目标点分类，但最重要的是，L1X产品在获取后2至5小时内即可在ESA服务器上获得。L1X产品在FTP服务器上保留5天，与相应L1B产品可用的时间相同。描述L1X和L1B产品之间差异的文档列于可用资源中。有关产品的更多详细信息，请参阅以下产品规范。