SCATRetMW

Retrieve Grody et al. scattering index from bias-adjusted 23.8 GHz, 31.4 GHz and 89 GHz channels over water surfaces only.

Required input parameters:

scatret_ch238

Channel number corresponding to 23.8 GHz to which the retrieval of scattering index applies:

scatret_ch314

Channel number corresponding to 31.4 GHz to which the retrieval of scattering index applies

scatret_890

Channel number corresponding to 89 GHz to which the retrieval of scattering index applies

scatret_types

Names of the data group used to retrieve the scattering index.

bias_application

Name of the data group to which the bias correction is applied (default is HofX).

test_bias

Name of the bias correction group used to replace the default group (default is ObsBias)

Consts:

Bad value:

bad_scatret_value = 1000.0f

Formula from SCATRetMW.cc:

\(SI = -113.2 + (2.41 - 0.0049 * bt_{ch238}) * bt_{ch238} + 0.454 * bt_{ch314} - bt_{ch890}\)

Restrictions:

• water_frac[iloc] >= 0.99

Note:

output value is 0 or greater.

References

Grody et al. (2000), Application of AMSU for obtaining hydrological parameters, Microw. Radiomet. Remote Sens. Eatch’s Surf. Atmosphere, pp. 339-351

Required yaml parameters

ATMS Example (atms_qc_filters.yaml):

scatobs_function:
  name: ObsFunction/SCATRetMW
  options:
    scatret_ch238: 1
    scatret_ch314: 2
    scatret_ch890: 16
    scatret_types: [ObsValue]

AMSUA Example (amsua_qc_filters.yaml):

scatobs_function:
  name: ObsFunction/SCATRetMW
  options:
    scatret_ch238: 1
    scatret_ch314: 2
    scatret_ch890: 15
    scatret_types: [ObsValue]
    bias_application: HofX