Concept information
Preferred term
TDDR
Definition
- Measurements of the spectral optical depth were made during ACE-1 (Nov.-Dec. 1995) using a Total Direct Diffuse Radiometer (TDDR) mounted in a zenith port of the NCAR C-130. The TDDR is a shadow-band radiometer with a hemispheric field of view and 7 channels (380, 412,500,675,862,1064, and 1640 nm). Each channel has a bandpass of approximately 10 nm. As its name implies, the TDDR measures the total, direct, and diffuse components of the solar radiation field from which the optical depth is obtained. The optical depth, as a function of wavelength, can then be inverted to derive an estimate of the column aerosol size distribution. [Source: NOAA] (en)
Broader concept
- Radiometers (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/770216a2-85bc-4f52-9a5b-120a0c1f5796
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