Atmospheric Thematic Data Product [MWR_TDPATM]

This is the Atmospheric Thematic Data Product (TDP) V1 resulting from the _$$ESA FDR4ALT project$$ https://www.fdr4alt.org/ and containing Total Column Water Vapour (TCWV), Cloud Liquid Water Path (LWP), Atmospheric Attenuation of the altimeter backscattering coefficient at Ku-band (AttKu), and Wet Tropospheric Correction (WTC), retrieved from observations of the Microwave Radiometer (MWR) instruments flown on-board the ERS-1, and ERS-2, and Envisat satellites.

Compared to existing datasets, the Atmospheric TDP demonstrates notable improvements in several aspects:

Improved temporal coverage, especially for ERS-2
Improved L0 -> 1 processing
Two different corrections are provided based on a neural network retrieval or on a 1D-VAR approach

The FDR4ALT products are available in NetCDF format. Free standard tools for reading NetCDF data can be used.
Information for expert altimetry users is also available in a dedicated NetCDF group within the products.
Please consult the _$$FDR4ALT Product User Guide$$ https://earth.esa.int/eogateway/documents/d/earth-online/fdr4alt-products-user-guide before using the data.
The FDR4ALT datasets represent the new reference data for the ERS/Envisat altimetry missions, superseding any previous mission data. Users are strongly encouraged to make use of these datasets for optimal results.

本数据集为大气主题数据产品（TDP）V1版本，源于$$ESA FDR4ALT项目$$（https://www.fdr4alt.org/），包含总量水汽（TCWV）、云液态水路径（LWP）、Ku波段雷达高度计后向散射系数大气衰减（AttKu）和湿对流层校正（WTC）等数据，数据来源于搭载在ERS-1、ERS-2及Envisat卫星上的微波辐射计（MWR）的观测结果。与现有数据集相比，大气TDP在多个方面展现出显著改进：时间覆盖范围得到提升，尤其是针对ERS-2；L0-1处理过程得到优化；提供了基于神经网络检索或一维变分法（1D-VAR）的两种不同校正方法。FDR4ALT产品以NetCDF格式提供。可使用免费标准工具读取NetCDF数据。产品中包含专门针对高级雷达高度计用户的NetCDF组信息。请在使用数据前查阅$$FDR4ALT产品用户指南$$（https://earth.esa.int/eogateway/documents/d/earth-online/fdr4alt-products-user-guide）。FDR4ALT数据集代表ERS/Envisat雷达高度计任务的新参考数据，取代了任何先前的任务数据。强烈建议用户使用这些数据集以获得最佳结果。