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 (ACIr) using the ground-based measuremen...
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ftosti:oai:osti.gov:1841552 2023-07-30T04:05:23+02:00 Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic Zheng, Xiaojian Xi, Baike Dong, Xiquan Wu, Peng Logan, Timothy Wang, Yuan 2022-04-06 application/pdf http://www.osti.gov/servlets/purl/1841552 https://www.osti.gov/biblio/1841552 https://doi.org/10.5194/acp-22-335-2022 unknown http://www.osti.gov/servlets/purl/1841552 https://www.osti.gov/biblio/1841552 https://doi.org/10.5194/acp-22-335-2022 doi:10.5194/acp-22-335-2022 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.5194/acp-22-335-2022 2023-07-11T10:09:41Z 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 (ACIr) using the ground-based measurements from the Department of Energy Atmospheric Radiation Measurement (ARM) facility at the ENA site during 2016–2018. The ACIr represents the relative change in cloud droplet effective radius re with respect to the relative change in cloud condensation nuclei (CCN) number concentration at 0.2% supersaturation (NCCN,0.2%) in the stratified water vapor environment. The ACIr values vary from -0.01 to 0.22 with increasing sub-cloud boundary layer precipitable water vapor (PWVBL) conditions, indicating that re 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 Nc and PWVBL. 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 (TKEw), the decoupling index (Di), and PWVBL. The environmental effects on ACIr emerge after the data are stratified into different TKEw regimes. The ACIr values, under both lower and higher PWVBL conditions, more than double from the low-TKEw to high-TKEw 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 re. The enhanced activation of CCN and the cloud droplet condensational growth induced by the higher below-cloud CCN loading can effectively decrease re, which jointly presents as ... Other/Unknown Material North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Atmospheric Chemistry and Physics 22 1 335 354 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Zheng, Xiaojian Xi, Baike Dong, Xiquan Wu, Peng Logan, Timothy Wang, Yuan Environmental effects on aerosol–cloud interaction in non-precipitating marine boundary layer (MBL) clouds over the eastern North Atlantic |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
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 (ACIr) using the ground-based measurements from the Department of Energy Atmospheric Radiation Measurement (ARM) facility at the ENA site during 2016–2018. The ACIr represents the relative change in cloud droplet effective radius re with respect to the relative change in cloud condensation nuclei (CCN) number concentration at 0.2% supersaturation (NCCN,0.2%) in the stratified water vapor environment. The ACIr values vary from -0.01 to 0.22 with increasing sub-cloud boundary layer precipitable water vapor (PWVBL) conditions, indicating that re 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 Nc and PWVBL. 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 (TKEw), the decoupling index (Di), and PWVBL. The environmental effects on ACIr emerge after the data are stratified into different TKEw regimes. The ACIr values, under both lower and higher PWVBL conditions, more than double from the low-TKEw to high-TKEw 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 re. The enhanced activation of CCN and the cloud droplet condensational growth induced by the higher below-cloud CCN loading can effectively decrease re, which jointly presents as ... |
author |
Zheng, Xiaojian Xi, Baike Dong, Xiquan Wu, Peng Logan, Timothy Wang, Yuan |
author_facet |
Zheng, Xiaojian Xi, Baike Dong, Xiquan Wu, Peng Logan, Timothy Wang, Yuan |
author_sort |
Zheng, Xiaojian |
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 |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1841552 https://www.osti.gov/biblio/1841552 https://doi.org/10.5194/acp-22-335-2022 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1841552 https://www.osti.gov/biblio/1841552 https://doi.org/10.5194/acp-22-335-2022 doi:10.5194/acp-22-335-2022 |
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 |
_version_ |
1772817240229412864 |