Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer
Clouds play an important role in controlling the radiative energy budget of the Arctic atmospheric boundary layer. To quantify the impact of clouds on the radiative heating or cooling of the lower atmosphere and of the surface, vertical profile observations of thermal-infrared irradiances were colle...
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ftdoajarticles:oai:doaj.org/article:7b7e59c59d564798b51b5984a6dfae96 2024-09-15T18:27:19+00:00 Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer M. Lonardi E. F. Akansu A. Ehrlich M. Mazzola C. Pilz M. D. Shupe H. Siebert M. Wendisch 2024-02-01T00:00:00Z https://doi.org/10.5194/acp-24-1961-2024 https://doaj.org/article/7b7e59c59d564798b51b5984a6dfae96 EN eng Copernicus Publications https://acp.copernicus.org/articles/24/1961/2024/acp-24-1961-2024.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-24-1961-2024 1680-7316 1680-7324 https://doaj.org/article/7b7e59c59d564798b51b5984a6dfae96 Atmospheric Chemistry and Physics, Vol 24, Pp 1961-1978 (2024) Physics QC1-999 Chemistry QD1-999 article 2024 ftdoajarticles https://doi.org/10.5194/acp-24-1961-2024 2024-08-05T17:50:02Z Clouds play an important role in controlling the radiative energy budget of the Arctic atmospheric boundary layer. To quantify the impact of clouds on the radiative heating or cooling of the lower atmosphere and of the surface, vertical profile observations of thermal-infrared irradiances were collected using a radiation measurement system carried by a tethered balloon. We present 70 profiles of thermal-infrared radiative quantities measured in summer 2020 during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition and in autumn 2021 and spring 2022 in Ny-Ålesund, Svalbard. Measurements are classified into four groups: cloudless, low-level liquid-bearing cloud, elevated liquid-bearing cloud, and elevated ice cloud. Cloudless cases display an average radiative cooling rate of about − 2 K d −1 throughout the atmospheric boundary layer. Instead, low-level liquid-bearing clouds are characterized by a radiative cooling up to − 80 K d −1 within a shallow layer at cloud top, while no temperature tendencies are identified underneath the cloud layer. Radiative transfer simulations are performed to quantify the sensitivity of radiative cooling rates to cloud microphysical properties. In particular, cloud top cooling is strongly driven by the liquid water path, especially in optically thin clouds, while for optically thick clouds the cloud droplet number concentration has an increased influence. Additional radiative transfer simulations are used to demonstrate the enhanced radiative importance of the liquid relative to ice clouds. To analyze the temporal evolution of thermal-infrared radiation profiles during the transitions from a cloudy to a cloudless atmosphere, a respective case study is investigated. Article in Journal/Newspaper Ny Ålesund Ny-Ålesund Svalbard Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 24 3 1961 1978 |
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Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 M. Lonardi E. F. Akansu A. Ehrlich M. Mazzola C. Pilz M. D. Shupe H. Siebert M. Wendisch Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Clouds play an important role in controlling the radiative energy budget of the Arctic atmospheric boundary layer. To quantify the impact of clouds on the radiative heating or cooling of the lower atmosphere and of the surface, vertical profile observations of thermal-infrared irradiances were collected using a radiation measurement system carried by a tethered balloon. We present 70 profiles of thermal-infrared radiative quantities measured in summer 2020 during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition and in autumn 2021 and spring 2022 in Ny-Ålesund, Svalbard. Measurements are classified into four groups: cloudless, low-level liquid-bearing cloud, elevated liquid-bearing cloud, and elevated ice cloud. Cloudless cases display an average radiative cooling rate of about − 2 K d −1 throughout the atmospheric boundary layer. Instead, low-level liquid-bearing clouds are characterized by a radiative cooling up to − 80 K d −1 within a shallow layer at cloud top, while no temperature tendencies are identified underneath the cloud layer. Radiative transfer simulations are performed to quantify the sensitivity of radiative cooling rates to cloud microphysical properties. In particular, cloud top cooling is strongly driven by the liquid water path, especially in optically thin clouds, while for optically thick clouds the cloud droplet number concentration has an increased influence. Additional radiative transfer simulations are used to demonstrate the enhanced radiative importance of the liquid relative to ice clouds. To analyze the temporal evolution of thermal-infrared radiation profiles during the transitions from a cloudy to a cloudless atmosphere, a respective case study is investigated. |
format |
Article in Journal/Newspaper |
author |
M. Lonardi E. F. Akansu A. Ehrlich M. Mazzola C. Pilz M. D. Shupe H. Siebert M. Wendisch |
author_facet |
M. Lonardi E. F. Akansu A. Ehrlich M. Mazzola C. Pilz M. D. Shupe H. Siebert M. Wendisch |
author_sort |
M. Lonardi |
title |
Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer |
title_short |
Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer |
title_full |
Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer |
title_fullStr |
Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer |
title_full_unstemmed |
Tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the Arctic atmospheric boundary layer |
title_sort |
tethered balloon-borne observations of thermal-infrared irradiance and cooling rate profiles in the arctic atmospheric boundary layer |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/acp-24-1961-2024 https://doaj.org/article/7b7e59c59d564798b51b5984a6dfae96 |
genre |
Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Ny Ålesund Ny-Ålesund Svalbard |
op_source |
Atmospheric Chemistry and Physics, Vol 24, Pp 1961-1978 (2024) |
op_relation |
https://acp.copernicus.org/articles/24/1961/2024/acp-24-1961-2024.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-24-1961-2024 1680-7316 1680-7324 https://doaj.org/article/7b7e59c59d564798b51b5984a6dfae96 |
op_doi |
https://doi.org/10.5194/acp-24-1961-2024 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
24 |
container_issue |
3 |
container_start_page |
1961 |
op_container_end_page |
1978 |
_version_ |
1810468541049077760 |