Configurations to analyse snow water equivalent in the SEKF

Input analysed snow depth by the 2D-OI (arpifs/obs_preproc/obsgen.F90)
Calculate and input additional EDA Jacobians related to snow (gen/fetchmars, arpifs/sekf/sekf_geteda_jacobians.F90)
- Covariances between soil moisture and snow depth are set to 0
- Covariances between snow water equivalent and 2m temperature, relative humidity, soil moisture are also set to 0
  - These 2 settings mean that observations to analyse each control variable are similar to the current system
- Jacobians between snow water equivalent and snow depth are set to 1/rsn (based on the relationship in the model)
Analyse snow water equivalent using the analysed snow depth and Jacobians (arpifs/sekf/sm_ekf_main.F90)
- σ_o=0.01 [m]
- σ_b=2.0 [kg/m²] (=0.01 [m] if ρ=200 [kg/m³])
So far, increments for snow water equivalent are not reflected to the analysis field (offline calculation only)

Result

Input snow observations directly in the SEKF (the same task as soil moisture analysis using 2m temperature and relative humidity)
- Need to implement a localization in observation space
- Each QC also should be implemented in the SEKF
Consider flow dependent background errors

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