Uncertainty in global downwelling plane
irradiance estimates from sintered
polytetrafluoroethylene plaque radiance
measurements
Posted on 2019-05-29 - 15:15
Global downwelling plane irradiance is a necessary variable to normalize the waterleaving
radiance measurements, reducing the magnitude and spectral variabilities introduced
by the incident light field. As a result, the normalized measurements, known as remote sensing
reflectance, have higher correlation with the inherent optical properties of the water body and
so to the composition of optically active water components. For in situ measurements, the
global downwelling plane irradiance can be estimated from the exitant radiance of sintered
polytetrafluoroethylene plaques or other diffuse reflectance standards. This allows use of a
single spectrometer to measure all necessary variables to estimate the remote sensing reflectance,
reducing cost in acquisition and maintenance of instrumentation. However, despite being in
use for more than 30 years, the uncertainty associated with the method has been only partially
evaluated. In this study, we use a suite of sky radiance distributions for twenty four atmospheres
and nine solar zenith angles in combination with full bidirectional reflectance distribution
function determinations of white and grey plaques to evaluate the uncertainties. The isolated
and interactive effects of bidirectional reflectance distribution, shadowing and tilt error sources
are evaluated. We found that under the best performing geometries of each plaque, and with
appropriate estimation functions, average standard uncertainty ranges from 1% to 6:5%. The
simulated errors are found to explain both previous empirical uncertainty estimates and new data
collected during this study. Those errors are of the same magnitude as uncertainties of plane
irradiance sensors (e.g., cosine collectors), and overlap with uncertainty requirements for different
uses of in situ data, which supports the continued use of the plaque method in hydrologic optics
research and monitoring. Recommendations are provided to improve the quality of measurements
and assure that uncertainties will be in the range of those calculated here.
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Castagna, Alexandre; Johnson, B.; Voss, Kenneth; Dierssen, Heidi; Patrick, Heather; Germer, Thomas; et al. (2019). Uncertainty in global downwelling plane
irradiance estimates from sintered
polytetrafluoroethylene plaque radiance
measurements. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4395179.v1
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AUTHORS (8)
AC
Alexandre Castagna
BJ
B. Johnson
KV
Kenneth Voss
HD
Heidi Dierssen
HP
Heather Patrick
TG
Thomas Germer
KS
Koen Sabbe
WV
Wim Vyverman