Changes between Version 40 and Version 41 of OMI_observation_modules


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Timestamp:
Mar 8, 2024, 10:58:27 AM (6 weeks ago)
Author:
lnerger
Comment:

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  • OMI_observation_modules

    v40 v41  
    155155 - Specify the localization variables (These variables are usually set in `init_pdaf` and included with `use mod_assimilation`)
    156156   - `locweight`: Type of localization (see table below)
    157    - `cradius`: The localization radius (cut-off radius for the observations, weight is always =0 for distances > cradius)
    158    - `sradius`: The support radius of the localization weight function
     157   - `cradius`: The localization radius or directional radii (cut-off radius for the observations, weight is always =0 for distances > cradius)
     158   - `sradius`: The support radius (or directional redii) of the localization weight function
    159159
    160160The setting of `locweight` influences the weight function for the localization. The choices are standardized as follows
     
    168168Here, 'regulation' refers to the regulated localization introduced in Nerger, L., Janjić, T., Schröter, J., Hiller, W. (2012). A regulated localization scheme for ensemble-based Kalman filters. Quarterly Journal of the Royal Meteorological Society, 138, 802-812. ​[https://doi.org/10.1002/qj.945 doi:10.1002/qj.945].
    169169
    170 Note:
    171 - The localization in OMI is isotropic. Thus, it uses the same `cradius` in all directions. If different localization scales should be applied e.g. in the vertical compared to the horizonal one needs to scale the vertical coordinates.
     170**Notes:**
     171- **isotropic localization**: If `cradius` and `sradius` are scalar values, the localization is isotropic. Thus, it uses the same `cradius` in all directions. If different localization scales should be applied e.g. in the vertical compared to the horizonal one needs to scale the vertical coordinates.
     172- **non-isotropic localization**: Nonisotropic localization was introduced with PDAF V2.2: `cradius` and `sradius` can declared as vectors of length `thisobs%ncoords` and each element can get a different value. In this case, the values defined a non-isotropic localization according to the values specified in `cradius` and `sradius`.
    172173
    173174== `localize_covar_OBSTYPE` ==
     
    189190   - `cradius`: The localization radius (cut-off radius for the observations, weight is always =0 for distances > cradius)
    190191   - `sradius`: The support radius of the localization weight function
     192
     193**Notes:**
     194- **isotropic localization**: If `cradius` and `sradius` are scalar values, the localization is isotropic. Thus, it uses the same `cradius` in all directions. If different localization scales should be applied e.g. in the vertical compared to the horizonal one needs to scale the vertical coordinates.
     195- **non-isotropic localization**: Nonisotropic localization was introduced with PDAF V2.2: `cradius` and `sradius` can declared as vectors of length `thisobs%ncoords` and each element can get a different value. In this case, the values defined a non-isotropic localization according to the values specified in `cradius` and `sradius`.
     196
    191197
    192198== Additional routines for 3D-Var ==