The solution to the radiance-to-irradiance conversion challenge is providedīy so-called angular distribution models (ADMs). Hartmann and Ceppi, 2014 Tett et al., 2013b, a Forster and Gregory, 2006),Īnd inform ERB assessments and scientific understanding (Loeb and Wielicki,Ģ015 Wild et al., 2015 Stephens et al., 2012 Trenberth, 2009 Vonder Haar Raghuraman et al., 2021), constrain and improve climate models (e.g., To quantify climate forcing and feedbacks (e.g., Ceppi and Nowack, 2021 Ĭesana and del Genio, 2021 Kramer et al., 2021 Myers et al., 2021 Products, rather than the direct radiance observations, that are most useful The irradiance is far more relevant forĮarth system energetics, and therefore it is the derived irradiance This radiance-to-irradianceĬonversion is particularly crucial in the shortwave (SW) where strongĪnisotropy is common, resulting from the surface bidirectional reflectanceĪnd the optical properties of the atmosphere including those of absorbing – a quantity that encompasses all view angles. Observations is the conversion of the measured radiance – a quantityĭependent on the angle at which a scene is viewed – to a derived irradiance A persistent challenge associated with ERB Kandel et al., 1998 Wielicki et al., 1996 Kyle et al., 1993 Barkstrom,ġ984 Jacobowitz et al., 1984 Raschke et al., 1973 Vonder Haar and Suomi,ġ971 Raschke and Bandeen, 1970). Of the satellite era through the present day (Harries et al., 2005 Consequently, they have been a mainstay from the dawn Monitoring Earth's climate because they track the amount of energy available Satellite observations of the Earth radiation budget (ERB) are essential for Opening up new measurement and science possibilities. Stand-alone irradiance products for arbitrary sets of spectral channels, This may also pave the way for future ERB satellite systems to develop Coupled with efforts to utilize a camera for scene identification, Observationally based VIS ADMs with minimal lag time following Libera's These results provide a path for generating Populated within a single day of sampling, a notable advance over existingĪpproaches. Synthetic camera sampling with realistic operating constraints alsoĭemonstrates that the angular radiance field of various scenes can be well Requiring only basic scene stratification for 555 nm to VIS conversion. Wavelength (555 nm) is shown to be ideal for representing the VIS sub-band, We present a general concept for how this can be achieved and quantify the proficiency of a camera to provide rapidĪngular distribution model (ADM) generation for the new Libera Wide-field-of-view camera to provide dense angular sampling in a much As an alternative approach, the capability of a monochromatic, “split-shortwave” planned to be part of the next-generation ERB mission To new ERB spectral channels that lack previous sampling, such as the Unfortunately, the CERES approach is not easily extended The state-of-the-art approach for radiance-to-irradiance conversion taken by theĬlouds and the Earth's Radiant Energy System (CERES) benefits from theĮxhaustive sampling of radiance anisotropy by multiple CERES instrumentsĪcross many years. Quantity routinely used in modeling and analysis of the climate system. Quantity, to a derived irradiance, which is the relevant energy balance Require conversion of the measured radiance, which is a remotely sensed Earth radiation budget (ERB) satellite observations
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