Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations
Abstract. Long-range transport of biogenic emissions from the coast of Antarctica, precipitation scavenging, and cloud processing are the main processes that influence the observed variability in Southern Ocean (SO) marine boundary layer (MBL) condensation nuclei (CN) and cloud condensation nuclei (...
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ftcdlib:oai:escholarship.org:ark:/13030/qt26v8t8w0 2023-09-05T13:13:27+02:00 Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations Sanchez, Kevin J Roberts, Gregory C Saliba, Georges Russell, Lynn M Twohy, Cynthia Reeves, Michael J Humphries, Ruhi S Keywood, Melita D Ward, Jason P McRobert, Ian M 1 - 36 2021-01-01 https://escholarship.org/uc/item/26v8t8w0 unknown eScholarship, University of California qt26v8t8w0 https://escholarship.org/uc/item/26v8t8w0 CC-BY Atmospheric Chemistry and Physics, vol 2020, iss 5 Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences article 2021 ftcdlib 2023-08-21T18:06:45Z Abstract. Long-range transport of biogenic emissions from the coast of Antarctica, precipitation scavenging, and cloud processing are the main processes that influence the observed variability in Southern Ocean (SO) marine boundary layer (MBL) condensation nuclei (CN) and cloud condensation nuclei (CCN) concentrations during the austral summer. Airborne particle measurements on the HIAPER GV from north-south transects between Hobart, Tasmania and 62° S during the Southern Ocean Clouds, Radiation Aerosol Transport Experimental Study (SOCRATES) were separated into four regimes comprising combinations of high and low concentrations of CCN and CN. In 5-day HYSPLIT back trajectories, air parcels with elevated CCN concentrations were almost always shown to have crossed the Antarctic coast, a location with elevated phytoplankton emissions relative to the rest of the SO. The presence of high CCN concentrations was also consistent with high cloud fractions over their trajectory, suggesting there was substantial growth of biogenically formed particles through cloud processing. Cases with low cloud fraction, due to the presence of cumulus clouds, had high CN concentrations, consistent with previously reported new particle formation in cumulus outflow regions. Measurements associated with elevated precipitation during the previous 1.5-days of their trajectory had low CCN concentrations indicating CCN were effectively scavenged by precipitation. A course-mode fitting algorithm was used to determine the primary marine aerosol (PMA) contribution which accounted for 0.07 µm) indicated that particle formation occurs more frequently above the MBL; however, the growth of recently formed particles typically occurs in the MBL, consistent with cloud processing and the condensation of volatile compound oxidation products. CCN measurements on the R/V Investigator as part of the second Clouds, Aerosols, Precipitation, Radiation and atmospheric Composition Over the southeRn Ocean (CAPRICORN-2) campaign were also conducted during the same ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean University of California: eScholarship Antarctic Austral Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences |
spellingShingle |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences Sanchez, Kevin J Roberts, Gregory C Saliba, Georges Russell, Lynn M Twohy, Cynthia Reeves, Michael J Humphries, Ruhi S Keywood, Melita D Ward, Jason P McRobert, Ian M Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations |
topic_facet |
Climate Action Astronomical and Space Sciences Atmospheric Sciences Meteorology & Atmospheric Sciences |
description |
Abstract. Long-range transport of biogenic emissions from the coast of Antarctica, precipitation scavenging, and cloud processing are the main processes that influence the observed variability in Southern Ocean (SO) marine boundary layer (MBL) condensation nuclei (CN) and cloud condensation nuclei (CCN) concentrations during the austral summer. Airborne particle measurements on the HIAPER GV from north-south transects between Hobart, Tasmania and 62° S during the Southern Ocean Clouds, Radiation Aerosol Transport Experimental Study (SOCRATES) were separated into four regimes comprising combinations of high and low concentrations of CCN and CN. In 5-day HYSPLIT back trajectories, air parcels with elevated CCN concentrations were almost always shown to have crossed the Antarctic coast, a location with elevated phytoplankton emissions relative to the rest of the SO. The presence of high CCN concentrations was also consistent with high cloud fractions over their trajectory, suggesting there was substantial growth of biogenically formed particles through cloud processing. Cases with low cloud fraction, due to the presence of cumulus clouds, had high CN concentrations, consistent with previously reported new particle formation in cumulus outflow regions. Measurements associated with elevated precipitation during the previous 1.5-days of their trajectory had low CCN concentrations indicating CCN were effectively scavenged by precipitation. A course-mode fitting algorithm was used to determine the primary marine aerosol (PMA) contribution which accounted for 0.07 µm) indicated that particle formation occurs more frequently above the MBL; however, the growth of recently formed particles typically occurs in the MBL, consistent with cloud processing and the condensation of volatile compound oxidation products. CCN measurements on the R/V Investigator as part of the second Clouds, Aerosols, Precipitation, Radiation and atmospheric Composition Over the southeRn Ocean (CAPRICORN-2) campaign were also conducted during the same ... |
format |
Article in Journal/Newspaper |
author |
Sanchez, Kevin J Roberts, Gregory C Saliba, Georges Russell, Lynn M Twohy, Cynthia Reeves, Michael J Humphries, Ruhi S Keywood, Melita D Ward, Jason P McRobert, Ian M |
author_facet |
Sanchez, Kevin J Roberts, Gregory C Saliba, Georges Russell, Lynn M Twohy, Cynthia Reeves, Michael J Humphries, Ruhi S Keywood, Melita D Ward, Jason P McRobert, Ian M |
author_sort |
Sanchez, Kevin J |
title |
Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations |
title_short |
Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations |
title_full |
Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations |
title_fullStr |
Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations |
title_full_unstemmed |
Measurement report: Cloud Processes and the Transport of Biological Emissions Regulate Southern Ocean Particle and Cloud Condensation Nuclei Concentrations |
title_sort |
measurement report: cloud processes and the transport of biological emissions regulate southern ocean particle and cloud condensation nuclei concentrations |
publisher |
eScholarship, University of California |
publishDate |
2021 |
url |
https://escholarship.org/uc/item/26v8t8w0 |
op_coverage |
1 - 36 |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
Atmospheric Chemistry and Physics, vol 2020, iss 5 |
op_relation |
qt26v8t8w0 https://escholarship.org/uc/item/26v8t8w0 |
op_rights |
CC-BY |
_version_ |
1776204723274121216 |