Downloading the Data¶
The data (about 0.7GB total) is available from our ftp server using the credentials:
username: osirislevel2user password: hugin
The level 2 profile data is distributed in monthly netcdf files with the naming convention:
The data conforms to CF-conventions 1.7 so should be readable by most NetCDF software. However, some simple python examples are included to help users get started, see Example Usage.
Changes from version 7.0 to 7.1¶
Several improvements have been made to the retrieval algorithm, resulting in minor changes to aerosol product. These updates include:
MERRA 2 pressure/temperature profiles are used instead of ERA interim
Retrieval iterative procedure is optimized to improve the number of scans which converge
Automatic determination of the lower bound is improved
Processed consistently with the other v7.1 OSIRIS products (ozone and NO2) instead of in a separate chain
In addition, small changes have been made to the formatting and naming of some data fields. In particular, information about detected clouds is reported as the cloud top altitude for each scan, as opposed to the two-dimensional cloud mask seen in v7.0. See Data Fields for a description of all data fields included in the product.
Changes from version 5.07 to 7.0¶
Several updates were made to the aerosol algorithm in version 7.0, which include:
Moved to Levenberg-Marquardt retrieval algorithm
Multi-wavelength measurement vector for improved UTLS sensitivity and reduced dependence on assumed particle size
Improved cloud flagging
Updated lower bounds
Updated satellite pointing that corrects long-term drifts
Release of v7.1 of the aerosol extinction product. Monthly files are processed up to March 2021.