@article{Ben-Yami:2022:10.5194/amt-15-1755-2022,
author = {Ben-Yami, M and Oetjen, H and Brindley, H and Cossich, W and Lajas, D and Maestri, T and Magurno, D and Raspollini, P and Sgheri, L and Warwick, L},
doi = {10.5194/amt-15-1755-2022},
journal = {Atmospheric Measurement Techniques},
pages = {1755--1777},
title = {Emissivity retrievals with FORUM's end-to-end simulator: challenges and recommendations},
url = {http://dx.doi.org/10.5194/amt-15-1755-2022},
volume = {15},
year = {2022}
}

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TY  - JOUR
AB  - Spectral emissivity is a key property of the Earth's surface, of which only very few measurements exist so far in the far-infrared (FIR) spectral region, even though recent work has shown that the FIR is important for accurate modelling of the global climate. The European Space Agency's 9th Earth Explorer, FORUM (Far-infrared Outgoing Radiation Understanding and Monitoring) will provide the first global spectrally resolved measurements of the Earth's top-of-the-atmosphere (TOA) spectrum in the FIR. In clear-sky conditions with low water vapour content, these measurements will provide a unique opportunity to retrieve spectrally resolved FIR surface emissivity. In preparation for the FORUM mission with an expected launch in 2027, this study takes the first steps towards the development of an operational emissivity retrieval for FORUM by investigating the sensitivity of the emissivity product of a full spectrum optimal estimation retrieval method to different physical and operational parameters. The tool used for the sensitivity tests is the FORUM mission's end-to-end simulator. These tests show that the spectral emissivity of most surface types can be retrieved for dry scenes in the 350–600 cm−1 region, with an absolute uncertainty ranging from 0.005 to 0.01. In addition, the quality of the retrieval is quantified with respect to the precipitable water vapour content of the scene, and the uncertainty caused by the correlation of emissivity with surface temperature is investigated. Based on these investigations, a road map is recommended for the development of the operational emissivity product.
AU  - Ben-Yami,M
AU  - Oetjen,H
AU  - Brindley,H
AU  - Cossich,W
AU  - Lajas,D
AU  - Maestri,T
AU  - Magurno,D
AU  - Raspollini,P
AU  - Sgheri,L
AU  - Warwick,L
DO  - 10.5194/amt-15-1755-2022
EP  - 1777
PY  - 2022///
SN  - 1867-1381
SP  - 1755
TI  - Emissivity retrievals with FORUM's end-to-end simulator: challenges and recommendations
T2  - Atmospheric Measurement Techniques
UR  - http://dx.doi.org/10.5194/amt-15-1755-2022
UR  - http://hdl.handle.net/10044/1/96225
VL  - 15
ER  - 

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