Speaker
Description
FIT-FORUM (Forward and Inverse Tool for FORUM) is a research project aimed at supporting the Italian scientific activities relating to the FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) mission onboard ESA’s ninth Earth Explorer satellite. In the preparatory phase of the mission, there is the need for accurate and versatile codes to compute the spectrally resolved Earth radiation escaping to space, target of the FORUM measurements. The main objective of the FIT FORUM project consists in the definition and development of innovative tools dealing with every aspect of radiative transfer for the simulation, analysis and interpretation of the FORUM sensor measurements, both in clear weather conditions and in the presence of clouds and aerosols.
In the context of the FORUM mission, a further research work was carried out to implement scattering within the KLIMA (Kyoto protocol-informed management of adaptation) model to simulate all sky conditions. This effort was supported thanks to the contribution of activities carried out in the context of the Earth-Moon-Mars (EMM) project, led by INAF in partnership with ASI and CNR, under the National Recovery and Resilience Plan (NRRP), funded by the European Union. To this aim, we carried out a study on 80 atmospheric scenarios, comparing the cloudy radiances simulated by two different codes, KLIMA and SIGMA-IASI, which are based on different radiative transfer models.
SIGMA-IASI is a forward model for all sky radiative transfer calculations in the spectral range 10 to 2760 cm−1. It allows calculating all-sky radiances by means of original parametrization of the optical depth of atmospheric gases and clouds. The cloud parametrization relies on suitable scaling laws, which make the radiative transfer equations for a cloudy atmosphere identical to those for a clear atmosphere.
The KLIMA code is a self-standing algorithm, developed in FORTRAN, able to simulate and analyze the atmospheric spectral radiance acquired by remote sensing measurements in clear sky conditions. It implements the computation of spectral radiance derivatives with respect to atmospheric parameters and therefore it is suitable to be used in retrieval codes. KLIMA has been extensively validated comparing its radiances to those generated by the widely used line-by-line radiative transfer model (LBLRTM) code.
The aim of this study is to extend the application of KLIMA to cloudy sky scenarios, a significant improvement in order to exploit the KLIMA key features in all sky conditions. The comparison between SIGMA-IASI and KLIMA results allowed for an evaluation of KLIMA's performance in cloudy conditions, presented here.
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Dinelli, B. M., Del Bianco, S., Castelli, E., Di Roma, A., Lorenzi, G., Premuda, M., ... & Di Natale, G. (2023). GBB-Nadir and KLIMA: Two Full Physics Codes for the Computation of the Infrared Spectrum of the Planetary Radiation Escaping to Space. Remote Sensing, 15(10), 2532.
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Martinazzo, M., Magurno, D., Cossich, W., Serio, C., Masiello, G., & Maestri, T. (2021). Assessment of the accuracy of scaling methods for radiance simulations at far and mid infrared wavelengths. Journal of Quantitative Spectroscopy and Radiative Transfer, 271, 107739.
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Masiello, Guido, et al. "The new σ-IASI code for all sky radiative transfer calculations in the spectral range 10 to 2760 cm-1: σ-IASI/F2N." Journal of Quantitative Spectroscopy and Radiative Transfer 312 (2024): 108814.
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Palchetti, L., et al. "unique far-infrared satellite observations to better understand how Earth radiates energy to space." Bulletin of the American meteorological society 101.12 (2020): E2030-E2046.
