Basics

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:

AEROSOL-L2-LP-OSIRIS_ODIN-SASK_v7_1-YYYYMM.nc

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

Processing Status

June 2021

Release of v7.1 of the aerosol extinction product. Monthly files are processed up to March 2021.