The Johnson-Williams Cloud Water Meter (CWM) utilizes a resistance wire that has been calibrated to infer liquid water content (LWC) within clouds. Evaporation of water droplets that impact the wire lead to temperature variations of the wire which can be linearly correlated with liquid water content. Additionally, a second wire allows compensation of altitude, temperature, and speed for more accurate measurements. The CWM can be operated over LWC ranges between 0 and 6 grams per cubic meter and at air speeds between 50 and 150 meters per second. Collection efficiency for the instrument has been shown to decrease when water droplets are larger than 30 micrometers; making the probe more beneficial for small droplet usage.
Instrument Details
- Magnetic/Electric
- Earth Science > Atmosphere > Clouds > Cloud Microphysics > Cloud Liquid Water/ice
- Troposphere
- 1 second - < 1 minute
- Point Resolution
- This data will be added in future versions
- https://doi.org/10.1175/1520-0450(1982)021%3C0098:COJWLW%3E2.0.CO;2
Currently unavailable
This data will be added in future versions
Johnson-Williams, Inc.
Currently unavailable
Currently unavailable
Unpublished
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