Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic
The aerosol particles that provide cloud condensation and ice nuclei contribute to key cloud processes associated with cold-air outbreak (CAO) events but are poorly constrained in climate models due to sparse observations. Here we retrieve aerosol size distribution modes from measurements at Andenes...
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ftcopernicus:oai:publications.copernicus.org:egusphere118428 2024-09-15T17:39:21+00:00 Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic Williams, Abigail S. Dedrick, Jeramy L. Russell, Lynn M. Tornow, Florian Silber, Israel Fridlind, Ann M. Swanson, Benjamin DeMott, Paul J. Zieger, Paul Krejci, Radovan 2024-04-04 application/pdf https://doi.org/10.5194/egusphere-2024-584 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-584/ eng eng doi:10.5194/egusphere-2024-584 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-584/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-584 2024-08-28T05:24:15Z The aerosol particles that provide cloud condensation and ice nuclei contribute to key cloud processes associated with cold-air outbreak (CAO) events but are poorly constrained in climate models due to sparse observations. Here we retrieve aerosol size distribution modes from measurements at Andenes, Norway during the Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE) and at Zeppelin Observatory, approximately 1000 km upwind in Svalbard. During CAO events at Andenes, the sea spray mode number concentration is correlated to strong over-ocean winds with a mean of 8±4 cm -3 that is 71 % higher than during non-CAO conditions. Additionally during CAO events at Andenes, the mean Hoppel minimum diameter is 6 nm smaller than during non-CAO conditions though the estimated supersaturation is lower and the number concentration of particles that likely activated in-cloud is 109±61 cm -3 (similar to non-CAO conditions). For CAO trajectories between Zeppelin Observatory and Andenes, the upwind-to-downwind change in number concentration is largest for the accumulation mode with a mean decrease of 93±95 cm -3 , likely attributable primarily to precipitation scavenging. These characteristic properties of aerosol size distributions during CAO events provide guidance for evaluating CAO aerosol-cloud interaction processes in models. Text Andenes Svalbard Copernicus Publications: E-Journals |
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Copernicus Publications: E-Journals |
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English |
description |
The aerosol particles that provide cloud condensation and ice nuclei contribute to key cloud processes associated with cold-air outbreak (CAO) events but are poorly constrained in climate models due to sparse observations. Here we retrieve aerosol size distribution modes from measurements at Andenes, Norway during the Cold-Air Outbreaks in the Marine Boundary Layer Experiment (COMBLE) and at Zeppelin Observatory, approximately 1000 km upwind in Svalbard. During CAO events at Andenes, the sea spray mode number concentration is correlated to strong over-ocean winds with a mean of 8±4 cm -3 that is 71 % higher than during non-CAO conditions. Additionally during CAO events at Andenes, the mean Hoppel minimum diameter is 6 nm smaller than during non-CAO conditions though the estimated supersaturation is lower and the number concentration of particles that likely activated in-cloud is 109±61 cm -3 (similar to non-CAO conditions). For CAO trajectories between Zeppelin Observatory and Andenes, the upwind-to-downwind change in number concentration is largest for the accumulation mode with a mean decrease of 93±95 cm -3 , likely attributable primarily to precipitation scavenging. These characteristic properties of aerosol size distributions during CAO events provide guidance for evaluating CAO aerosol-cloud interaction processes in models. |
format |
Text |
author |
Williams, Abigail S. Dedrick, Jeramy L. Russell, Lynn M. Tornow, Florian Silber, Israel Fridlind, Ann M. Swanson, Benjamin DeMott, Paul J. Zieger, Paul Krejci, Radovan |
spellingShingle |
Williams, Abigail S. Dedrick, Jeramy L. Russell, Lynn M. Tornow, Florian Silber, Israel Fridlind, Ann M. Swanson, Benjamin DeMott, Paul J. Zieger, Paul Krejci, Radovan Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic |
author_facet |
Williams, Abigail S. Dedrick, Jeramy L. Russell, Lynn M. Tornow, Florian Silber, Israel Fridlind, Ann M. Swanson, Benjamin DeMott, Paul J. Zieger, Paul Krejci, Radovan |
author_sort |
Williams, Abigail S. |
title |
Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic |
title_short |
Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic |
title_full |
Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic |
title_fullStr |
Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic |
title_full_unstemmed |
Aerosol Size Distribution Properties Associated with Cold-Air Outbreaks in the Norwegian Arctic |
title_sort |
aerosol size distribution properties associated with cold-air outbreaks in the norwegian arctic |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-584 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-584/ |
genre |
Andenes Svalbard |
genre_facet |
Andenes Svalbard |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2024-584 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-584/ |
op_doi |
https://doi.org/10.5194/egusphere-2024-584 |
_version_ |
1810479355296481280 |