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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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/358302 2023-05-15T14:53:06+02:00 Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings Eirund, Gesa K. Possner, Anna Lohmann, Ulrike 2019-08-02 application/application/pdf https://hdl.handle.net/20.500.11850/358302 https://doi.org/10.3929/ethz-b-000358302 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-19-9847-2019 info:eu-repo/semantics/altIdentifier/wos/000478696200007 info:eu-repo/grantAgreement/EC/FP7/603445 http://hdl.handle.net/20.500.11850/358302 doi:10.3929/ethz-b-000358302 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Atmospheric Chemistry and Physics, 19 (15) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftethz https://doi.org/20.500.11850/358302 https://doi.org/10.3929/ethz-b-000358302 https://doi.org/10.5194/acp-19-9847-2019 2023-02-13T00:48:36Z 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 ETH Zürich Research Collection Arctic |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
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 |
Eirund, Gesa K. Possner, Anna Lohmann, Ulrike |
spellingShingle |
Eirund, Gesa K. Possner, Anna Lohmann, Ulrike Response of Arctic mixed-phase clouds to aerosol perturbations under different surface forcings |
author_facet |
Eirund, Gesa K. Possner, Anna Lohmann, Ulrike |
author_sort |
Eirund, Gesa K. |
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 |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11850/358302 https://doi.org/10.3929/ethz-b-000358302 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
Atmospheric Chemistry and Physics, 19 (15) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-19-9847-2019 info:eu-repo/semantics/altIdentifier/wos/000478696200007 info:eu-repo/grantAgreement/EC/FP7/603445 http://hdl.handle.net/20.500.11850/358302 doi:10.3929/ethz-b-000358302 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/358302 https://doi.org/10.3929/ethz-b-000358302 https://doi.org/10.5194/acp-19-9847-2019 |
_version_ |
1766324516507615232 |