CLWRetMW

Retrieve cloud liquid water using 23.8 GHz and 31.4 GHz channels from AMSU-like instruments. Follows the Grody et al., 2001 screening method, see publication or source code for specific implementation

References:

Grody et al. (2001), Determination of precipitable water and cloud liquid water over oceans from the NOAA 15 advanced microwave sounding unit, Journal of Geophysical Research (Vol. 106, No. D3, Pages 2943-2953).

Required yaml parameters:

clwret_types

Names of the data group used to retrieve the cloud liquid water. Values could be [ObsValue], [HofX] or [ObsValue, HofX].

Optional yaml parameters:

clwret_ch238

Channel number corresponding to 23.8 GHz channel .

clwret_ch314

Channel number corresponding to 31.4 GHz channel.

bias_application

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

test_bias

Name of the bias correction group used to replace the default group (default is ObsBiasData). Could be a group name from the input file. This option is usually used for testing/validation purposes.

The following parameters are intended for cloud index for some sensors, e.g., GMI.

clwret_ch37h

Channel number corresponding to 37H channel.

clwret_ch37v

Channel number corresponding to 37V channel.

The following parameters are intended for cloud index for some sensors, e.g., MHS

clwret_ch89h

Channel number corresponding to 89H channel.

clwret_ch166v

Channel number corresponding to 166V channel.

The following parameters are intended for cloud index for some sensors, e.g., AMSR2

clwret_ch18h

Channel number corresponding to 18H channel.

clwret_ch18v

Channel number corresponding to 18V channel .

clwret_ch36h

Channel number corresponding to 36H channel .

clwret_ch36v

Channel number corresponding to 36V channel.

Example configuration:

AMSU-A Example (amsua_qc_clwretmw.yaml):

- filter: Bounds Check
  filter variables:
  - name: brightnessTemperature
    channels: 1-6, 15
  test variables:
  - name: ObsFunction/CLWRetMW
    options:
      clwret_ch238: 1
      clwret_ch314: 2
      clwret_types: [ObsValue]
      test_group: GsiObsBias
  maxvalue: 999.0
  action:
    name: reject