EO Sign In Authentication (Open): This collection is openly accessible but requires users to log in with an EO Sign In account (a system used across ESA Earth Observation services) before any downloads can proceed.

Access Steps:

1. Create or log in to EO Sign In acccount
2. Go to the Dissemination Service
3. Browse or search for the collection. 
4. Download product.

The dissemination service provides the latest reprocessed Envisat SCIAMACHY higher level data.

The data is collection based and allows data browsing and download via treeview and filename search options.

Data download is available via HTTPS, including bulk download functionality. ESA internal users can use their ESAAD account to access the HTTPS Dissemination Service.

Access to ftps://hm-atmos-ds.eo.esa.int is available via common FTP clients using implicit FTP over TLS and your own EO Sign In credentials. For internal ESA users the ESAAD account cannot be used for FTP access.

This Envisat SCIAMACHY Level 2 Total column densities and stratospheric profiles v7.1 dataset is generated from the full mission reprocessing campaign completed in 2023 under the ESA FDR4ATMOS project.

It provides atmospheric columnar distributions and stratospheric profiles for various trace gases based on the Level 1b version 10 products.

This SCIAMACHY Level 2 dataset contains:

• total column densities of O3, NO2, OClO, H2O, SO2, BrO, CO, HCHO, CHOCHO and CH4 retrieved from Nadir measurements
• cloud parameters: fractional coverage, top height, optical thickness
• an aerosol absorption indicator, stratospheric profiles of O3, NO2, and BrO are derived from limb measurements
• flagging information for different cloud types
• tropospheric NO2 and BrO columns are retrieved combining limb and nadir measurements

This SCIAMACHY Level 2 dataset version 7.1 replaces the previous version 6.01. Users are strongly encouraged to make use of the new datasets for optimal results.

For limb O3 profiles, a separate product derived from the previous Version 6 processor is provided distinctly:

• SCIAMACHY Level 2 - Limb Ozone [SCI_LIMBO3].

This is because the V7.1 limb ozone data is unsuitable for long-term change studies due to its divergent behavior from earlier processor versions, particularly from 2009 onwards. This divergence stems from residual deficiencies in the Level 1, resulting in a vertical oscillating pattern in the drift and bias profiles. In contrast, Version 6 limb ozone data does not exhibit these oscillations in bias and drift. Further details on this issue can be found in the latest README file.

The new products are conveniently formatted in NetCDF. Free standard tools, such as Panoply, can be used to read NetCDF data. 

Note: Panoply is sourced and updated by external entities. For further details, please consult our Terms and Conditions page.

Please refer to the README file for essential guidance before using the data.