Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic
Over the eastern North Atlantic (ENA) ocean, a total of 20 non-precipitating single-layer marine boundary layer (MBL) stratus and stratocumulus cloud cases are selected to investigate the impacts of the environmental variables on the aerosol–cloud interaction ( ACI r ) using the ground-based measure...
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ftdoajarticles:oai:doaj.org/article:a72d57c678d64b82b088da6c5532e37b 2023-05-15T17:32:38+02:00 Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic X. Zheng B. Xi X. Dong P. Wu T. Logan Y. Wang 2022-01-01T00:00:00Z https://doi.org/10.5194/acp-22-335-2022 https://doaj.org/article/a72d57c678d64b82b088da6c5532e37b EN eng Copernicus Publications https://acp.copernicus.org/articles/22/335/2022/acp-22-335-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-335-2022 1680-7316 1680-7324 https://doaj.org/article/a72d57c678d64b82b088da6c5532e37b Atmospheric Chemistry and Physics, Vol 22, Pp 335-354 (2022) Physics QC1-999 Chemistry QD1-999 article 2022 ftdoajarticles https://doi.org/10.5194/acp-22-335-2022 2022-12-31T10:57:44Z Over the eastern North Atlantic (ENA) ocean, a total of 20 non-precipitating single-layer marine boundary layer (MBL) stratus and stratocumulus cloud cases are selected to investigate the impacts of the environmental variables on the aerosol–cloud interaction ( ACI r ) using the ground-based measurements from the Department of Energy Atmospheric Radiation Measurement (ARM) facility at the ENA site during 2016–2018. The ACI r represents the relative change in cloud droplet effective radius r e with respect to the relative change in cloud condensation nuclei (CCN) number concentration at 0.2 % supersaturation ( N CCN,0.2 % ) in the stratified water vapor environment. The ACI r values vary from − 0.01 to 0.22 with increasing sub-cloud boundary layer precipitable water vapor ( PWV BL ) conditions, indicating that r e is more sensitive to the CCN loading under sufficient water vapor supply, owing to the combined effect of enhanced condensational growth and coalescence processes associated with higher N c and PWV BL . The principal component analysis shows that the most pronounced pattern during the selected cases is the co-variations in the MBL conditions characterized by the vertical component of turbulence kinetic energy ( TKE w ), the decoupling index ( D i ), and PWV BL . The environmental effects on ACI r emerge after the data are stratified into different TKE w regimes. The ACI r values, under both lower and higher PWV BL conditions, more than double from the low- TKE w to high- TKE w regime. This can be explained by the fact that stronger boundary layer turbulence maintains a well-mixed MBL, strengthening the connection between cloud microphysical properties and the below-cloud CCN and moisture sources. With sufficient water vapor and low CCN loading, the active coalescence process broadens the cloud droplet size spectra and consequently results in an enlargement of r e . The enhanced activation of CCN and the cloud droplet condensational growth induced by the higher below-cloud CCN loading can effectively ... Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 22 1 335 354 |
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topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 X. Zheng B. Xi X. Dong P. Wu T. Logan Y. Wang Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Over the eastern North Atlantic (ENA) ocean, a total of 20 non-precipitating single-layer marine boundary layer (MBL) stratus and stratocumulus cloud cases are selected to investigate the impacts of the environmental variables on the aerosol–cloud interaction ( ACI r ) using the ground-based measurements from the Department of Energy Atmospheric Radiation Measurement (ARM) facility at the ENA site during 2016–2018. The ACI r represents the relative change in cloud droplet effective radius r e with respect to the relative change in cloud condensation nuclei (CCN) number concentration at 0.2 % supersaturation ( N CCN,0.2 % ) in the stratified water vapor environment. The ACI r values vary from − 0.01 to 0.22 with increasing sub-cloud boundary layer precipitable water vapor ( PWV BL ) conditions, indicating that r e is more sensitive to the CCN loading under sufficient water vapor supply, owing to the combined effect of enhanced condensational growth and coalescence processes associated with higher N c and PWV BL . The principal component analysis shows that the most pronounced pattern during the selected cases is the co-variations in the MBL conditions characterized by the vertical component of turbulence kinetic energy ( TKE w ), the decoupling index ( D i ), and PWV BL . The environmental effects on ACI r emerge after the data are stratified into different TKE w regimes. The ACI r values, under both lower and higher PWV BL conditions, more than double from the low- TKE w to high- TKE w regime. This can be explained by the fact that stronger boundary layer turbulence maintains a well-mixed MBL, strengthening the connection between cloud microphysical properties and the below-cloud CCN and moisture sources. With sufficient water vapor and low CCN loading, the active coalescence process broadens the cloud droplet size spectra and consequently results in an enlargement of r e . The enhanced activation of CCN and the cloud droplet condensational growth induced by the higher below-cloud CCN loading can effectively ... |
format |
Article in Journal/Newspaper |
author |
X. Zheng B. Xi X. Dong P. Wu T. Logan Y. Wang |
author_facet |
X. Zheng B. Xi X. Dong P. Wu T. Logan Y. Wang |
author_sort |
X. Zheng |
title |
Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic |
title_short |
Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic |
title_full |
Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic |
title_fullStr |
Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic |
title_full_unstemmed |
Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic |
title_sort |
environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (mbl) clouds over the eastern north atlantic |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-335-2022 https://doaj.org/article/a72d57c678d64b82b088da6c5532e37b |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Chemistry and Physics, Vol 22, Pp 335-354 (2022) |
op_relation |
https://acp.copernicus.org/articles/22/335/2022/acp-22-335-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-335-2022 1680-7316 1680-7324 https://doaj.org/article/a72d57c678d64b82b088da6c5532e37b |
op_doi |
https://doi.org/10.5194/acp-22-335-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
1 |
container_start_page |
335 |
op_container_end_page |
354 |
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1766130838260416512 |