The Semi-Direct Aerosol-Cloud Effects
This thesis is composed of two parts. In the first part we investigate the impact of Saharan dust on North Atlantic marine stratocumulus clouds (MSc) using Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), Clouds and the Earth's Radiant Energy System (CERES), and Euro...
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2018
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ftcdlib:oai:escholarship.org/ark:/13030/qt49d0x04k 2023-05-15T17:30:33+02:00 The Semi-Direct Aerosol-Cloud Effects Amiri Farahani, Anahita Allen, Robert James 2018-01-01 application/pdf https://escholarship.org/uc/item/49d0x04k en eng eScholarship, University of California qt49d0x04k https://escholarship.org/uc/item/49d0x04k public Atmospheric sciences aerosol aerosol-cloud interactions cloud semi-direct effect etd 2018 ftcdlib 2021-02-18T15:14:24Z This thesis is composed of two parts. In the first part we investigate the impact of Saharan dust on North Atlantic marine stratocumulus clouds (MSc) using Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), Clouds and the Earth's Radiant Energy System (CERES), and European Centre for Medium-Range Weather Forecasts Interim Re-Analysis (ERA-Interim). To calculate the aerosol- cloud radiative effect, we use two different methods These two methods yield similar results that Saharan dust modifies MSc in a way that acts to cool the planet. There is a strong seasonal variation, with the aerosol-cloud radiative effect switching from significantly negative during the boreal summer to weakly positive during boreal winter. When most dust resides above the clouds during summer, aerosol-cloud microphysical effects that involve the co-location of aerosol and cloud, such as the second aerosol indirect effect, would likely be muted relative to the SDE. Moreover, the positive value of the aerosol-cloud radiative effect during winter, when most dust resides within MSc, indicates that the semi-direct effect is dominant$-$ that is the only mechanism by a negative aerosol-cloud radiative effect can be obtained. We conclude that aerosol-cloud radiative effects associated with Saharan dust and North Atlantic MSc are dominated by the semi-direct effect. Other/Unknown Material North Atlantic University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Atmospheric sciences aerosol aerosol-cloud interactions cloud semi-direct effect |
spellingShingle |
Atmospheric sciences aerosol aerosol-cloud interactions cloud semi-direct effect Amiri Farahani, Anahita The Semi-Direct Aerosol-Cloud Effects |
topic_facet |
Atmospheric sciences aerosol aerosol-cloud interactions cloud semi-direct effect |
description |
This thesis is composed of two parts. In the first part we investigate the impact of Saharan dust on North Atlantic marine stratocumulus clouds (MSc) using Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), Clouds and the Earth's Radiant Energy System (CERES), and European Centre for Medium-Range Weather Forecasts Interim Re-Analysis (ERA-Interim). To calculate the aerosol- cloud radiative effect, we use two different methods These two methods yield similar results that Saharan dust modifies MSc in a way that acts to cool the planet. There is a strong seasonal variation, with the aerosol-cloud radiative effect switching from significantly negative during the boreal summer to weakly positive during boreal winter. When most dust resides above the clouds during summer, aerosol-cloud microphysical effects that involve the co-location of aerosol and cloud, such as the second aerosol indirect effect, would likely be muted relative to the SDE. Moreover, the positive value of the aerosol-cloud radiative effect during winter, when most dust resides within MSc, indicates that the semi-direct effect is dominant$-$ that is the only mechanism by a negative aerosol-cloud radiative effect can be obtained. We conclude that aerosol-cloud radiative effects associated with Saharan dust and North Atlantic MSc are dominated by the semi-direct effect. |
author2 |
Allen, Robert James |
format |
Other/Unknown Material |
author |
Amiri Farahani, Anahita |
author_facet |
Amiri Farahani, Anahita |
author_sort |
Amiri Farahani, Anahita |
title |
The Semi-Direct Aerosol-Cloud Effects |
title_short |
The Semi-Direct Aerosol-Cloud Effects |
title_full |
The Semi-Direct Aerosol-Cloud Effects |
title_fullStr |
The Semi-Direct Aerosol-Cloud Effects |
title_full_unstemmed |
The Semi-Direct Aerosol-Cloud Effects |
title_sort |
semi-direct aerosol-cloud effects |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/49d0x04k |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
qt49d0x04k https://escholarship.org/uc/item/49d0x04k |
op_rights |
public |
_version_ |
1766127391387680768 |