Observations of high droplet number concentrations in Southern Ocean boundary layer clouds
Cloud physics data collected during the NSF/NCAR High-performance Instrumented Airborne Platform for Environmental Research (HIAPER) Pole-to-Pole Observations (HIPPO) campaigns provide a snapshot of unusual wintertime microphysical conditions in the boundary layer over the Southern Ocean. On 29 June...
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ftdoajarticles:oai:doaj.org/article:105c185aba64477e94f5ef986724ce6a 2023-05-15T18:24:38+02:00 Observations of high droplet number concentrations in Southern Ocean boundary layer clouds T. Chubb Y. Huang J. Jensen T. Campos S. Siems M. Manton 2016-01-01T00:00:00Z https://doi.org/10.5194/acp-16-971-2016 https://doaj.org/article/105c185aba64477e94f5ef986724ce6a EN eng Copernicus Publications https://www.atmos-chem-phys.net/16/971/2016/acp-16-971-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-971-2016 1680-7316 1680-7324 https://doaj.org/article/105c185aba64477e94f5ef986724ce6a Atmospheric Chemistry and Physics, Vol 16, Pp 971-987 (2016) Physics QC1-999 Chemistry QD1-999 article 2016 ftdoajarticles https://doi.org/10.5194/acp-16-971-2016 2022-12-31T04:20:36Z Cloud physics data collected during the NSF/NCAR High-performance Instrumented Airborne Platform for Environmental Research (HIAPER) Pole-to-Pole Observations (HIPPO) campaigns provide a snapshot of unusual wintertime microphysical conditions in the boundary layer over the Southern Ocean. On 29 June 2011, the HIAPER sampled the boundary layer in a region of pre-frontal warm air advection between 58 and 48° S to the south of Tasmania. Cloud droplet number concentrations were consistent with climatological values in the northernmost profiles but were exceptionally high for wintertime in the Southern Ocean at 100–200 cm −3 in the southernmost profiles. Sub-micron (0.06 < D < 1 µm) aerosol concentrations for the southern profiles were up to 400 cm −3 . Analysis of back trajectories and atmospheric chemistry observations revealed that while conditions in the troposphere were more typical of a clean remote ocean airmass, there was some evidence of continental or anthropogenic influence. However, the hypothesis of long-range transport of continental aerosol fails to explain the magnitude of the aerosol and cloud droplet concentration in the boundary layer. Instead, the gale force surface winds in this case (wind speed at 167 m above sea level was > 25 m s −1 ) were most likely responsible for production of sea spray aerosol which influenced the microphysical properties of the boundary layer clouds. The smaller size and higher number concentration of cloud droplets is inferred to increase the albedo of these clouds, and these conditions occur regularly, and are expected to increase in frequency, over windy parts of the Southern Ocean. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Atmospheric Chemistry and Physics 16 2 971 987 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 T. Chubb Y. Huang J. Jensen T. Campos S. Siems M. Manton Observations of high droplet number concentrations in Southern Ocean boundary layer clouds |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Cloud physics data collected during the NSF/NCAR High-performance Instrumented Airborne Platform for Environmental Research (HIAPER) Pole-to-Pole Observations (HIPPO) campaigns provide a snapshot of unusual wintertime microphysical conditions in the boundary layer over the Southern Ocean. On 29 June 2011, the HIAPER sampled the boundary layer in a region of pre-frontal warm air advection between 58 and 48° S to the south of Tasmania. Cloud droplet number concentrations were consistent with climatological values in the northernmost profiles but were exceptionally high for wintertime in the Southern Ocean at 100–200 cm −3 in the southernmost profiles. Sub-micron (0.06 < D < 1 µm) aerosol concentrations for the southern profiles were up to 400 cm −3 . Analysis of back trajectories and atmospheric chemistry observations revealed that while conditions in the troposphere were more typical of a clean remote ocean airmass, there was some evidence of continental or anthropogenic influence. However, the hypothesis of long-range transport of continental aerosol fails to explain the magnitude of the aerosol and cloud droplet concentration in the boundary layer. Instead, the gale force surface winds in this case (wind speed at 167 m above sea level was > 25 m s −1 ) were most likely responsible for production of sea spray aerosol which influenced the microphysical properties of the boundary layer clouds. The smaller size and higher number concentration of cloud droplets is inferred to increase the albedo of these clouds, and these conditions occur regularly, and are expected to increase in frequency, over windy parts of the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
T. Chubb Y. Huang J. Jensen T. Campos S. Siems M. Manton |
author_facet |
T. Chubb Y. Huang J. Jensen T. Campos S. Siems M. Manton |
author_sort |
T. Chubb |
title |
Observations of high droplet number concentrations in Southern Ocean boundary layer clouds |
title_short |
Observations of high droplet number concentrations in Southern Ocean boundary layer clouds |
title_full |
Observations of high droplet number concentrations in Southern Ocean boundary layer clouds |
title_fullStr |
Observations of high droplet number concentrations in Southern Ocean boundary layer clouds |
title_full_unstemmed |
Observations of high droplet number concentrations in Southern Ocean boundary layer clouds |
title_sort |
observations of high droplet number concentrations in southern ocean boundary layer clouds |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/acp-16-971-2016 https://doaj.org/article/105c185aba64477e94f5ef986724ce6a |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Atmospheric Chemistry and Physics, Vol 16, Pp 971-987 (2016) |
op_relation |
https://www.atmos-chem-phys.net/16/971/2016/acp-16-971-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-971-2016 1680-7316 1680-7324 https://doaj.org/article/105c185aba64477e94f5ef986724ce6a |
op_doi |
https://doi.org/10.5194/acp-16-971-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
2 |
container_start_page |
971 |
op_container_end_page |
987 |
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1766205386351706112 |