@article{Di:2026:10.5194/acp-26-1373-2026,
author = {Di, Natale G and Brindley, H and Murray, J and Warwick, L and Panditharatne, S and Yang, P and David, RO and Carlsen, T and Vâjâiac, SN and Ghemulet, S and Bantges, R and Foth, A and Flügge, M and Lyngra, R and Oetjen, H and Schuettemeyer, D and Palchetti, L and Murray, J},
doi = {10.5194/acp-26-1373-2026},
journal = {Atmospheric Chemistry and Physics (ACP)},
pages = {1373--1394},
title = {Achieving consistency between in-situ and remotely sensed optical and microphysical properties of Arctic cirrus: the impact of far-infrared radiances},
url = {http://dx.doi.org/10.5194/acp-26-1373-2026},
volume = {26},
year = {2026}
}

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TY  - JOUR
AB  - This paper explores whether it is possible to achieve consistency between ground-based infrared radiance measurements made in the presence of cirrus, co-located in-situ aircraft measurements of the cirrus microphysics, and ancillary ground-based remote sensing. Specifically we use spectrally resolved radiances covering the range 400–1500 cm−1, in-situ measurements of cirrus particle sizes and habits, backscatter ceilometer observations of cloud vertical structure and microwave inferred temperature and humidity profiles to investigate whether we can obtain consistency between the derived cloud properties and atmospheric state from these independent sources of data. The primary focus of this study is on the sensitivity of the retrieved cloud particle size to the assumed crystal habit. Excellent consistency between the retrieved cloud parameters is achieved both with the ceilometer derived optical depth and the size distribution measured by the aircraft by assuming the crystal habit to be comprised of bullet rosettes. The averaged values of the effective diameter and optical depth obtained from radiometric measurements are (26.5 ± 1.8) µm and (0.12 ± 0.01) in comparison with the values derived from in-situ and ceilometer measurements equal to (31.5 ± 5.0) µm and (0.13 ± 0.01), respectively. Furthermore, we show that the radiance information contained within the far-infrared (wavenumbers < 650 cm−1) spectrum is critical to achieving this level of agreement with the in-situ aircraft observations. The results emphasize why it is vital to expand the current limited database of measurements encompassing the far-infrared spectrum, particularly in the presence of cirrus, to explore whether this finding holds over a wider range of conditions.
AU  - Di,Natale G
AU  - Brindley,H
AU  - Murray,J
AU  - Warwick,L
AU  - Panditharatne,S
AU  - Yang,P
AU  - David,RO
AU  - Carlsen,T
AU  - Vâjâiac,SN
AU  - Ghemulet,S
AU  - Bantges,R
AU  - Foth,A
AU  - Flügge,M
AU  - Lyngra,R
AU  - Oetjen,H
AU  - Schuettemeyer,D
AU  - Palchetti,L
AU  - Murray,J
DO  - 10.5194/acp-26-1373-2026
EP  - 1394
PY  - 2026///
SN  - 1680-7316
SP  - 1373
TI  - Achieving consistency between in-situ and remotely sensed optical and microphysical properties of Arctic cirrus: the impact of far-infrared radiances
T2  - Atmospheric Chemistry and Physics (ACP)
UR  - http://dx.doi.org/10.5194/acp-26-1373-2026
UR  - https://acp.copernicus.org/articles/26/1373/2026/
VL  - 26
ER  - 

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