Airborne observations of far-infrared upwelling radiance in the Arctic
The first airborne measurements of the Far- InfraRed Radiometer (FIRR) were performed in April 2015 during the panarctic NETCARE campaign. Vertical profiles of spectral upwelling radiance in the range 8–50 μm were measured in clear and cloudy conditions from the surface up to 6 km. The clear sky pro...
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ftunivquebec:oai:www.archipel.uqam.ca:9248 2023-05-15T14:43:16+02:00 Airborne observations of far-infrared upwelling radiance in the Arctic Libois, Quentin Ivanescu, Liviu Blanchet, Jean-Pierre Schulz, Hannes Bozem, Heiko Leaitch, W. Richard Burkart, Julia Abbatt, Jonathan P. D. Herber, Andreas B. Aliabadi, Amir A. Girard, Éric 2016 application/pdf http://www.archipel.uqam.ca/9248/1/Libois_et_al_AtmosChemPhys_2016_16-15689.pdf en eng http://www.archipel.uqam.ca/9248/ http://dx.doi.org/10.5194/acp-16-15689-2016 doi:10.5194/acp-16-15689-2016 Airborne measurements Far-InfraRed InfraRed Measurements Radiative properties Clouds cover Arctic Atmosphere Article de revue scientifique PeerReviewed 2016 ftunivquebec https://doi.org/10.5194/acp-16-15689-2016 2017-09-02T23:03:36Z The first airborne measurements of the Far- InfraRed Radiometer (FIRR) were performed in April 2015 during the panarctic NETCARE campaign. Vertical profiles of spectral upwelling radiance in the range 8–50 μm were measured in clear and cloudy conditions from the surface up to 6 km. The clear sky profiles highlight the strong dependence of radiative fluxes to the temperature inversion typical of the Arctic. Measurements acquired for total column water vapour from 1.5 to 10.5mm also underline the sensitivity of the far-infrared greenhouse effect to specific humidity. The cloudy cases show that optically thin ice clouds increase the cooling rate of the atmosphere, making them important pieces of the Arctic energy balance. One such cloud exhibited a very complex spatial structure, characterized by large horizontal heterogeneities at the kilometre scale. This emphasizes the difficulty of obtaining representative cloud observations with airborne measurements but also points out how challenging it is to model polar clouds radiative effects. These radiance measurements were successfully compared to simulations, suggesting that state-of-the-art radiative transfer models are suited to study the cold and dry Arctic atmosphere. Although FIRR in situ performances compare well to its laboratory performances, complementary simulations show that upgrading the FIRR radiometric resolution would greatly increase its sensitivity to atmospheric and cloud properties. Improved instrument temperature stability in flight and expected technological progress should help meet this objective. The campaign overall highlights the potential for airborne far-infrared radiometry and constitutes a relevant reference for future similar studies dedicated to the Arctic and for the development of spaceborne instruments. Text Arctic UQAM - Université du Québec à Montréal: archipel Arctic Atmospheric Chemistry and Physics 16 24 15689 15707 |
institution |
Open Polar |
collection |
UQAM - Université du Québec à Montréal: archipel |
op_collection_id |
ftunivquebec |
language |
English |
topic |
Airborne measurements Far-InfraRed InfraRed Measurements Radiative properties Clouds cover Arctic Atmosphere |
spellingShingle |
Airborne measurements Far-InfraRed InfraRed Measurements Radiative properties Clouds cover Arctic Atmosphere Libois, Quentin Ivanescu, Liviu Blanchet, Jean-Pierre Schulz, Hannes Bozem, Heiko Leaitch, W. Richard Burkart, Julia Abbatt, Jonathan P. D. Herber, Andreas B. Aliabadi, Amir A. Girard, Éric Airborne observations of far-infrared upwelling radiance in the Arctic |
topic_facet |
Airborne measurements Far-InfraRed InfraRed Measurements Radiative properties Clouds cover Arctic Atmosphere |
description |
The first airborne measurements of the Far- InfraRed Radiometer (FIRR) were performed in April 2015 during the panarctic NETCARE campaign. Vertical profiles of spectral upwelling radiance in the range 8–50 μm were measured in clear and cloudy conditions from the surface up to 6 km. The clear sky profiles highlight the strong dependence of radiative fluxes to the temperature inversion typical of the Arctic. Measurements acquired for total column water vapour from 1.5 to 10.5mm also underline the sensitivity of the far-infrared greenhouse effect to specific humidity. The cloudy cases show that optically thin ice clouds increase the cooling rate of the atmosphere, making them important pieces of the Arctic energy balance. One such cloud exhibited a very complex spatial structure, characterized by large horizontal heterogeneities at the kilometre scale. This emphasizes the difficulty of obtaining representative cloud observations with airborne measurements but also points out how challenging it is to model polar clouds radiative effects. These radiance measurements were successfully compared to simulations, suggesting that state-of-the-art radiative transfer models are suited to study the cold and dry Arctic atmosphere. Although FIRR in situ performances compare well to its laboratory performances, complementary simulations show that upgrading the FIRR radiometric resolution would greatly increase its sensitivity to atmospheric and cloud properties. Improved instrument temperature stability in flight and expected technological progress should help meet this objective. The campaign overall highlights the potential for airborne far-infrared radiometry and constitutes a relevant reference for future similar studies dedicated to the Arctic and for the development of spaceborne instruments. |
format |
Text |
author |
Libois, Quentin Ivanescu, Liviu Blanchet, Jean-Pierre Schulz, Hannes Bozem, Heiko Leaitch, W. Richard Burkart, Julia Abbatt, Jonathan P. D. Herber, Andreas B. Aliabadi, Amir A. Girard, Éric |
author_facet |
Libois, Quentin Ivanescu, Liviu Blanchet, Jean-Pierre Schulz, Hannes Bozem, Heiko Leaitch, W. Richard Burkart, Julia Abbatt, Jonathan P. D. Herber, Andreas B. Aliabadi, Amir A. Girard, Éric |
author_sort |
Libois, Quentin |
title |
Airborne observations of far-infrared upwelling radiance in the Arctic |
title_short |
Airborne observations of far-infrared upwelling radiance in the Arctic |
title_full |
Airborne observations of far-infrared upwelling radiance in the Arctic |
title_fullStr |
Airborne observations of far-infrared upwelling radiance in the Arctic |
title_full_unstemmed |
Airborne observations of far-infrared upwelling radiance in the Arctic |
title_sort |
airborne observations of far-infrared upwelling radiance in the arctic |
publishDate |
2016 |
url |
http://www.archipel.uqam.ca/9248/1/Libois_et_al_AtmosChemPhys_2016_16-15689.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://www.archipel.uqam.ca/9248/ http://dx.doi.org/10.5194/acp-16-15689-2016 doi:10.5194/acp-16-15689-2016 |
op_doi |
https://doi.org/10.5194/acp-16-15689-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
24 |
container_start_page |
15689 |
op_container_end_page |
15707 |
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1766314958639857664 |