Coupled atmospheric surface observations with surface aerosol particle counts for daytime sky radiance quantification

Wolfmeyer, Scott; Thomas, Grant; Fiorino, Steven T.

doi:10.1117/12.2518876

Cited by 1 publication

(2 citation statements)

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“…Previous research demonstrated that the most accurate sky radiance simulations are generated with various combinations of numerical weather prediction (NWP) models, and Extreme and Percentile Environmental Reference Tables (ExPERT) data, measured particle and meteorological observational inputs (Wolfmeyer et al 2019). Thus, a subset of LEEDR radiance models were simulated as shown in Table 1.…”

Section: A Leedr Model Generationmentioning

confidence: 99%

“…Within LEEDR, wavelength specific complex indices of refraction for GADS aerosol species are interpolated from preloaded datasets (Fiorino et al 2014). However, the GADS aerosol loading may be adjusted to more closely match current conditions by scaling the entire profile based on surface-level particle count measurements (Wolfmeyer et al 2019). The particle count data taken with the moderated aerosol growth with the water-based condensation particle counter (MAGIC-CPC) from aerosol dynamics during the observation window are shown in Fig.…”

Section: ) Aerosol Scalingmentioning

confidence: 99%

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Daytime Cloudless Sky Radiance Quantification with Ground-Based Aerosol and Meteorological Observations in the Shortwave Infrared

Thomas

Cobb

Fiorino

et al. 2020

Journal of Atmospheric and Oceanic Technology

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Daytime spectral sky radiance, or sky brightness, is deceptively complex to predict accurately. The Laser Environmental Effects Definition and Reference (LEEDR) first-principles atmospheric model propagates the spectral radiance of the sun to a sensor by modeling the scattering, absorption, and transmission of the radiated light through representative atmospheric layers. For this application, LEEDR was used to ingest numerical weather prediction (NWP) models, and scale the boundary layer and incorporate aerosol loading with ground-based measurements. This study compares LEEDR-derived spectral sky radiance simulations that include measured climatological, measured meteorological, and aerosol loading data to direct sky radiance measurements. Direct measurements of the daytime sky are accomplished with a 1-m-aperture telescope and simultaneous I-band and J-band camera observations (~0.8 and ~1.2 μm, respectively). LEEDR models of the daytime sky are compared to I-band and J-band radiances at multiple azimuths, elevations, and observation times. Residual error analysis is used to determine the accuracy of models including numerical weather prediction data, historical climatology, scaled aerosol loading via in situ particle count measurements, and meteorological updates. Key findings motivate the inclusion of real-time particle count measurements into future daytime sky radiance models for increased scattering accuracy via realistic atmospheric aerosol loading.

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Section: A Leedr Model Generationmentioning

confidence: 99%

Section: ) Aerosol Scalingmentioning

confidence: 99%