The C1 site for ARM’s Tropical Western Pacific (TWP) began operations in 1996 on Manus Island, Papua New Guinea. ARM chose this island because of its location in the heart of the Pacific warm pool, which plays a large role in the interannual variability observed in the global climate system.
Unlike the SGP site, the tropical atmosphere is not convectively active throughout the entire year. Activity comes in seasonal weather phenomena such as El Niño–Southern Oscillation. Understanding the these phenomena is critical for improving global climate models.
c1
 
Instruments deployed at TWP - Central Facility, Manus I., PNG
Primary Measurements collected at twp - Central Facility, Manus I., PNG
Aerosol optical depth
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Aerosol optical properties
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Atmospheric moisture
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Atmospheric pressure
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Atmospheric temperature
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Backscattered radiation
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Cloud base height
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Cloud fraction
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Horizontal wind
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Hydrometeor Size Distribution
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Hydrometeor fall velocity
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Hydrometeor size
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Lidar polarization
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Liquid water path
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Longwave broadband downwelling irradiance
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Longwave broadband upwelling irradiance
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Longwave narrowband brightness temperature
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Longwave spectral radiance
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Microwave narrowband brightness temperature
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Precipitable water
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Precipitation
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Radar Doppler
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Radar polarization
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Radar reflectivity
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Shortwave broadband diffuse downwelling irradiance
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Shortwave broadband direct normal irradiance
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Shortwave broadband total downwelling irradiance
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Shortwave narrowband diffuse downwelling irradiance
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Shortwave narrowband direct normal irradiance
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Shortwave narrowband radiance
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Shortwave narrowband total downwelling irradiance
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Vertical velocity
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Visibility
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