Imperial College London
Alternate

Professor Juliet C Pickering

Faculty of Natural Sciences, Department of Physics

Professor of Experimental Physics
 
 
 
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Contact

 

+44 (0)20 7594 7763j.pickering Website

 
 
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Location

 

706Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bantges:2020:10.5194/acp-20-12889-2020,
author = {Bantges, RJ and Brindley, HE and Murray, JE and Last, AE and Russell, JE and Fox, C and Fox, S and Harlow, C and O'Shea, SJ and Bower, KN and Baum, BA and Yang, P and Oetjen, H and Pickering, JC},
doi = {10.5194/acp-20-12889-2020},
journal = {Atmospheric Chemistry and Physics},
pages = {12889--12903},
title = {A test of the ability of current bulk optical models to represent the radiative properties of cirrus cloud across the mid- and far-infrared},
url = {http://dx.doi.org/10.5194/acp-20-12889-2020},
volume = {20},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Measurements of mid- to far-infrared nadir radiances obtained from the UK Facility for Airborne Atmospheric Measurements (FAAM) BAe 146 aircraft during the Cirrus Coupled Cloud-Radiation Experiment (CIRCCREX) are used to assess the performance of various ice cloud bulk optical property models. Through use of a minimization approach, we find that the simulations can reproduce the observed spectra in the mid-infrared to within measurement uncertainty, but they are unable to simultaneously match the observations over the far-infrared frequency range. When both mid- and far-infrared observations are used to minimize residuals, first-order estimates of the spectral flux differences between the best-performing simulations and observations indicate a compensation effect between the mid- and far-infrared such that the absolute broadband difference is < 0.7 W m−2. However, simply matching the spectra using the mid-infrared (far-infrared) observations in isolation leads to substantially larger discrepancies, with absolute differences reaching ∼ 1.8 (3.1) W m−2. These results show that simulations using these microphysical models may give a broadly correct integrated longwave radiative impact but that this masks spectral errors, with implicit consequences for the vertical distribution of atmospheric heating. They also imply that retrievals using these models applied to mid-infrared radiances in isolation will select cirrus optical properties that are inconsistent with far-infrared radiances. As such, the results highlight the potential benefit of more extensive far-infrared observations for the assessment and, where necessary, the improvement of current ice bulk optical models.
AU  - Bantges,RJ
AU  - Brindley,HE
AU  - Murray,JE
AU  - Last,AE
AU  - Russell,JE
AU  - Fox,C
AU  - Fox,S
AU  - Harlow,C
AU  - O'Shea,SJ
AU  - Bower,KN
AU  - Baum,BA
AU  - Yang,P
AU  - Oetjen,H
AU  - Pickering,JC
DO  - 10.5194/acp-20-12889-2020
EP  - 12903
PY  - 2020///
SN  - 1680-7316
SP  - 12889
TI  - A test of the ability of current bulk optical models to represent the radiative properties of cirrus cloud across the mid- and far-infrared
T2  - Atmospheric Chemistry and Physics
UR  - http://dx.doi.org/10.5194/acp-20-12889-2020
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000585733800004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://acp.copernicus.org/articles/20/12889/2020/
UR  - http://hdl.handle.net/10044/1/85288
VL  - 20
ER  -
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