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 prof...
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ftdoajarticles:oai:doaj.org/article:26c7c62d49cc4bbc9ef0c139b75e7f2a 2023-05-15T14:47:09+02:00 Airborne observations of far-infrared upwelling radiance in the Arctic Q. Libois L. Ivanescu J.-P. Blanchet H. Schulz H. Bozem W. R. Leaitch J. Burkart J. P. D. Abbatt A. B. Herber A. A. Aliabadi É. Girard 2016-12-01T00:00:00Z https://doi.org/10.5194/acp-16-15689-2016 https://doaj.org/article/26c7c62d49cc4bbc9ef0c139b75e7f2a EN eng Copernicus Publications https://www.atmos-chem-phys.net/16/15689/2016/acp-16-15689-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-15689-2016 1680-7316 1680-7324 https://doaj.org/article/26c7c62d49cc4bbc9ef0c139b75e7f2a Atmospheric Chemistry and Physics, Vol 16, Pp 15689-15707 (2016) Physics QC1-999 Chemistry QD1-999 article 2016 ftdoajarticles https://doi.org/10.5194/acp-16-15689-2016 2022-12-31T10:12:09Z 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 10.5 mm 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. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 16 24 15689 15707 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 Q. Libois L. Ivanescu J.-P. Blanchet H. Schulz H. Bozem W. R. Leaitch J. Burkart J. P. D. Abbatt A. B. Herber A. A. Aliabadi É. Girard Airborne observations of far-infrared upwelling radiance in the Arctic |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
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 10.5 mm 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 |
Article in Journal/Newspaper |
author |
Q. Libois L. Ivanescu J.-P. Blanchet H. Schulz H. Bozem W. R. Leaitch J. Burkart J. P. D. Abbatt A. B. Herber A. A. Aliabadi É. Girard |
author_facet |
Q. Libois L. Ivanescu J.-P. Blanchet H. Schulz H. Bozem W. R. Leaitch J. Burkart J. P. D. Abbatt A. B. Herber A. A. Aliabadi É. Girard |
author_sort |
Q. Libois |
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 |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/acp-16-15689-2016 https://doaj.org/article/26c7c62d49cc4bbc9ef0c139b75e7f2a |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 16, Pp 15689-15707 (2016) |
op_relation |
https://www.atmos-chem-phys.net/16/15689/2016/acp-16-15689-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-15689-2016 1680-7316 1680-7324 https://doaj.org/article/26c7c62d49cc4bbc9ef0c139b75e7f2a |
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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