African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados
The number concentration and properties of aerosol particles serving as cloud condensation nuclei (CCN) are important for understanding cloud formation, particularly in the tropical Atlantic marine boundary layer (MBL) where marine cumulus clouds reflect incoming solar radiation and obscure the low-...
Main Authors: | , , , , , , , , , , , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-2022-341 https://acp.copernicus.org/preprints/acp-2022-341/ |
id |
ftcopernicus:oai:publications.copernicus.org:acpd103174 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:acpd103174 2023-05-15T17:31:41+02:00 African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados Royer, Haley M. Pöhlker, Mira L. Krüger, Ovid Blades, Edmund Sealy, Peter Lata, Nurun Nahar Cheng, Zezhen China, Swarup Ault, Andrew P. Quinn, Patricia K. Zuidema, Paquita Pöhlker, Christopher Pöschl, Ulrich Gaston, Cassandra 2022-05-24 application/pdf https://doi.org/10.5194/acp-2022-341 https://acp.copernicus.org/preprints/acp-2022-341/ eng eng doi:10.5194/acp-2022-341 https://acp.copernicus.org/preprints/acp-2022-341/ eISSN: 1680-7324 Text 2022 ftcopernicus https://doi.org/10.5194/acp-2022-341 2022-05-30T16:22:42Z The number concentration and properties of aerosol particles serving as cloud condensation nuclei (CCN) are important for understanding cloud formation, particularly in the tropical Atlantic marine boundary layer (MBL) where marine cumulus clouds reflect incoming solar radiation and obscure the low-albedo ocean surface. Studies linking aerosol source, composition, and water uptake properties in this region have been conducted primarily during summertime dust transport, despite the region receiving a variety of aerosol particle types throughout the year. In this study, we compare size-resolved aerosol chemical composition data to the hygroscopicity parameter κ derived from size-resolved CCN measurements made during the EUREC 4 A and ATOMIC campaigns from January to February 2020. We observed unexpected periods of wintertime long-range transport of African smoke and dust to Barbados. During these periods, the accumulation mode aerosol particle and CCN number concentrations as well as the proportions of dust and smoke particles increased while the average κ slightly decreased (κ = 0.45+0.1) from marine background conditions (κ = 0.52+0.08) when the particles were mostly composed of marine organics and sulfate. Size-resolved chemical analysis shows that smoke particles were the major contributor to the accumulation mode aerosol during long-range transport events, indicating that smoke is mainly responsible for the observed increase in CCN number concentrations. Earlier studies conducted at Barbados have mostly focused on the role of dust on CCN, but our results show that aerosol hygroscopicity and CCN number concentrations during wintertime long-range transport events over the tropical North Atlantic are affected by African smoke more than dust. Our findings highlight the importance of African smoke for atmospheric processes and cloud formation over the Caribbean. Text North Atlantic Copernicus Publications: E-Journals |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The number concentration and properties of aerosol particles serving as cloud condensation nuclei (CCN) are important for understanding cloud formation, particularly in the tropical Atlantic marine boundary layer (MBL) where marine cumulus clouds reflect incoming solar radiation and obscure the low-albedo ocean surface. Studies linking aerosol source, composition, and water uptake properties in this region have been conducted primarily during summertime dust transport, despite the region receiving a variety of aerosol particle types throughout the year. In this study, we compare size-resolved aerosol chemical composition data to the hygroscopicity parameter κ derived from size-resolved CCN measurements made during the EUREC 4 A and ATOMIC campaigns from January to February 2020. We observed unexpected periods of wintertime long-range transport of African smoke and dust to Barbados. During these periods, the accumulation mode aerosol particle and CCN number concentrations as well as the proportions of dust and smoke particles increased while the average κ slightly decreased (κ = 0.45+0.1) from marine background conditions (κ = 0.52+0.08) when the particles were mostly composed of marine organics and sulfate. Size-resolved chemical analysis shows that smoke particles were the major contributor to the accumulation mode aerosol during long-range transport events, indicating that smoke is mainly responsible for the observed increase in CCN number concentrations. Earlier studies conducted at Barbados have mostly focused on the role of dust on CCN, but our results show that aerosol hygroscopicity and CCN number concentrations during wintertime long-range transport events over the tropical North Atlantic are affected by African smoke more than dust. Our findings highlight the importance of African smoke for atmospheric processes and cloud formation over the Caribbean. |
format |
Text |
author |
Royer, Haley M. Pöhlker, Mira L. Krüger, Ovid Blades, Edmund Sealy, Peter Lata, Nurun Nahar Cheng, Zezhen China, Swarup Ault, Andrew P. Quinn, Patricia K. Zuidema, Paquita Pöhlker, Christopher Pöschl, Ulrich Gaston, Cassandra |
spellingShingle |
Royer, Haley M. Pöhlker, Mira L. Krüger, Ovid Blades, Edmund Sealy, Peter Lata, Nurun Nahar Cheng, Zezhen China, Swarup Ault, Andrew P. Quinn, Patricia K. Zuidema, Paquita Pöhlker, Christopher Pöschl, Ulrich Gaston, Cassandra African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados |
author_facet |
Royer, Haley M. Pöhlker, Mira L. Krüger, Ovid Blades, Edmund Sealy, Peter Lata, Nurun Nahar Cheng, Zezhen China, Swarup Ault, Andrew P. Quinn, Patricia K. Zuidema, Paquita Pöhlker, Christopher Pöschl, Ulrich Gaston, Cassandra |
author_sort |
Royer, Haley M. |
title |
African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados |
title_short |
African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados |
title_full |
African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados |
title_fullStr |
African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados |
title_full_unstemmed |
African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados |
title_sort |
african smoke particles act as cloud condensation nuclei in the wintertime tropical north atlantic boundary layer over barbados |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-2022-341 https://acp.copernicus.org/preprints/acp-2022-341/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-2022-341 https://acp.copernicus.org/preprints/acp-2022-341/ |
op_doi |
https://doi.org/10.5194/acp-2022-341 |
_version_ |
1766129376662913024 |