Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings
The formation and persistence of low-lying mixed-phase clouds (MPCs) in the Arctic depends on a multitude of processes, such as surface conditions, the environmental state, air mass advection, and the ambient aerosol concentration. In this study, we focus on the relative importance of different inst...
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ftdoajarticles:oai:doaj.org/article:1371c1957b614640acb88a5d7635dcb1 2023-05-15T14:53:08+02:00 Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings G. K. Eirund A. Possner U. Lohmann 2019-08-01T00:00:00Z https://doi.org/10.5194/acp-19-9847-2019 https://doaj.org/article/1371c1957b614640acb88a5d7635dcb1 EN eng Copernicus Publications https://www.atmos-chem-phys.net/19/9847/2019/acp-19-9847-2019.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-19-9847-2019 1680-7316 1680-7324 https://doaj.org/article/1371c1957b614640acb88a5d7635dcb1 Atmospheric Chemistry and Physics, Vol 19, Pp 9847-9864 (2019) Physics QC1-999 Chemistry QD1-999 article 2019 ftdoajarticles https://doi.org/10.5194/acp-19-9847-2019 2022-12-31T03:44:11Z The formation and persistence of low-lying mixed-phase clouds (MPCs) in the Arctic depends on a multitude of processes, such as surface conditions, the environmental state, air mass advection, and the ambient aerosol concentration. In this study, we focus on the relative importance of different instantaneous aerosol perturbations (cloud condensation nuclei and ice-nucleating particles; CCN and INPs, respectively) on MPC properties in the European Arctic. To address this topic, we performed high-resolution large-eddy simulation (LES) experiments using the Consortium for Small-scale Modeling (COSMO) model and designed a case study for the Aerosol-Cloud Coupling and Climate Interactions in the Arctic (ACCACIA) campaign in March 2013. Motivated by ongoing sea ice retreat, we performed all sensitivity studies over open ocean and sea ice to investigate the effect of changing surface conditions. We find that surface conditions highly impact cloud dynamics, consistent with the ACCACIA observations: over sea ice, a rather homogeneous, optically thin, mixed-phase stratus cloud forms. In contrast, the MPC over the open ocean has a stratocumulus-like cloud structure. With cumuli feeding moisture into the stratus layer, the cloud over the open ocean features a higher liquid (LWP) and ice water path (IWP) and has a lifted cloud base and cloud top compared to the cloud over sea ice. Furthermore, we analyzed the aerosol impact on the sea ice and open ocean cloud regime. Perturbation aerosol concentrations relevant for CCN activation were increased to a range between 100 and 1000 cm −3 and ice-nucleating particle perturbations were increased by 100 % and 300 % compared to the background concentration (at every grid point and at all levels). The perturbations are prognostic to allow for fully interactive aerosol–cloud interactions. Perturbations in the INP concentration increase IWP and decrease LWP consistently in both regimes. The cloud microphysical response to potential CCN perturbations occurs faster in the stratocumulus ... Article in Journal/Newspaper Arctic Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 19 15 9847 9864 |
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topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 G. K. Eirund A. Possner U. Lohmann Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The formation and persistence of low-lying mixed-phase clouds (MPCs) in the Arctic depends on a multitude of processes, such as surface conditions, the environmental state, air mass advection, and the ambient aerosol concentration. In this study, we focus on the relative importance of different instantaneous aerosol perturbations (cloud condensation nuclei and ice-nucleating particles; CCN and INPs, respectively) on MPC properties in the European Arctic. To address this topic, we performed high-resolution large-eddy simulation (LES) experiments using the Consortium for Small-scale Modeling (COSMO) model and designed a case study for the Aerosol-Cloud Coupling and Climate Interactions in the Arctic (ACCACIA) campaign in March 2013. Motivated by ongoing sea ice retreat, we performed all sensitivity studies over open ocean and sea ice to investigate the effect of changing surface conditions. We find that surface conditions highly impact cloud dynamics, consistent with the ACCACIA observations: over sea ice, a rather homogeneous, optically thin, mixed-phase stratus cloud forms. In contrast, the MPC over the open ocean has a stratocumulus-like cloud structure. With cumuli feeding moisture into the stratus layer, the cloud over the open ocean features a higher liquid (LWP) and ice water path (IWP) and has a lifted cloud base and cloud top compared to the cloud over sea ice. Furthermore, we analyzed the aerosol impact on the sea ice and open ocean cloud regime. Perturbation aerosol concentrations relevant for CCN activation were increased to a range between 100 and 1000 cm −3 and ice-nucleating particle perturbations were increased by 100 % and 300 % compared to the background concentration (at every grid point and at all levels). The perturbations are prognostic to allow for fully interactive aerosol–cloud interactions. Perturbations in the INP concentration increase IWP and decrease LWP consistently in both regimes. The cloud microphysical response to potential CCN perturbations occurs faster in the stratocumulus ... |
format |
Article in Journal/Newspaper |
author |
G. K. Eirund A. Possner U. Lohmann |
author_facet |
G. K. Eirund A. Possner U. Lohmann |
author_sort |
G. K. Eirund |
title |
Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
title_short |
Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
title_full |
Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
title_fullStr |
Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
title_full_unstemmed |
Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
title_sort |
response of arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/acp-19-9847-2019 https://doaj.org/article/1371c1957b614640acb88a5d7635dcb1 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
Atmospheric Chemistry and Physics, Vol 19, Pp 9847-9864 (2019) |
op_relation |
https://www.atmos-chem-phys.net/19/9847/2019/acp-19-9847-2019.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-19-9847-2019 1680-7316 1680-7324 https://doaj.org/article/1371c1957b614640acb88a5d7635dcb1 |
op_doi |
https://doi.org/10.5194/acp-19-9847-2019 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
19 |
container_issue |
15 |
container_start_page |
9847 |
op_container_end_page |
9864 |
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1766324544614694912 |