Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols
AbstractTwo years of continuous in situ measurements of Arctic low‐level clouds have been made at the Mount Zeppelin Observatory (78°56′N, 11°53′E), in Ny‐Ålesund, Spitsbergen. The monthly median value of the cloud particle number concentration (Nc) showed a clear seasonal variation: Its maximum app...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | https://www.openaccessrepository.it/record/91947 https://doi.org/10.1029/2018jd029802 |
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ftopenaccessrep:oai:zenodo.org:91947 2023-10-25T01:34:51+02:00 Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols Ove Hermansen C. A. Pedersen Masataka Shiobara Angelo Lupi Vito Vitale Jinro Ukita Johan Ström Peter Tunved Christoph Ritter Darrel Baumgardner Makoto Koike K. Yamada 2019-02-15 https://www.openaccessrepository.it/record/91947 https://doi.org/10.1029/2018jd029802 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/91947 doi:10.1029/2018jd029802 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics info:eu-repo/semantics/article publication-article 2019 ftopenaccessrep https://doi.org/10.1029/2018jd029802 2023-09-26T22:17:15Z AbstractTwo years of continuous in situ measurements of Arctic low‐level clouds have been made at the Mount Zeppelin Observatory (78°56′N, 11°53′E), in Ny‐Ålesund, Spitsbergen. The monthly median value of the cloud particle number concentration (Nc) showed a clear seasonal variation: Its maximum appeared in May–July (65 ± 8 cm−3), and it remained low between October and March (8 ± 7 cm−3). At temperatures warmer than 0 °C, a clear correlation was found between the hourly Nc values and the number concentrations of aerosols with dry diameters larger than 70 nm (N70), which are proxies for cloud condensation nuclei (CCN). When clouds were detected at temperatures colder than 0 °C, some of the data followed the summertime Nc to N70 relationship, while other data showed systematically lower Nc values. The lidar‐derived depolarization ratios suggested that the former (CCN‐controlled) and latter (CCN‐uncontrolled) data generally corresponded to clouds consisting of supercooled water droplets and those containing ice particles, respectively. The CCN‐controlled data persistently appeared throughout the year at Zeppelin. The aerosol‐cloud interaction index (ACI = dlnNc/(3dlnN70)) for the CCN‐controlled data showed high sensitivities to aerosols both in the summer (clean air) and winter–spring (Arctic haze) seasons (0.22 ± 0.03 and 0.25 ± 0.02, respectively). The air parcel model calculations generally reproduced these values. The threshold diameters of aerosol activation (Dact), which account for the Nc of the CCN‐controlled data, were as low as 30–50 nm when N70 was less than 30 cm−3, suggesting that new particle formation can affect Arctic cloud microphysics. Article in Journal/Newspaper Arctic Ny Ålesund Ny-Ålesund Spitsbergen Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Arctic Mount Zeppelin ENVELOPE(-61.480,-61.480,-64.444,-64.444) Ny-Ålesund Journal of Geophysical Research: Atmospheres 124 3 1798 1822 |
institution |
Open Polar |
collection |
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
op_collection_id |
ftopenaccessrep |
language |
English |
topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
spellingShingle |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics Ove Hermansen C. A. Pedersen Masataka Shiobara Angelo Lupi Vito Vitale Jinro Ukita Johan Ström Peter Tunved Christoph Ritter Darrel Baumgardner Makoto Koike K. Yamada Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols |
topic_facet |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
description |
AbstractTwo years of continuous in situ measurements of Arctic low‐level clouds have been made at the Mount Zeppelin Observatory (78°56′N, 11°53′E), in Ny‐Ålesund, Spitsbergen. The monthly median value of the cloud particle number concentration (Nc) showed a clear seasonal variation: Its maximum appeared in May–July (65 ± 8 cm−3), and it remained low between October and March (8 ± 7 cm−3). At temperatures warmer than 0 °C, a clear correlation was found between the hourly Nc values and the number concentrations of aerosols with dry diameters larger than 70 nm (N70), which are proxies for cloud condensation nuclei (CCN). When clouds were detected at temperatures colder than 0 °C, some of the data followed the summertime Nc to N70 relationship, while other data showed systematically lower Nc values. The lidar‐derived depolarization ratios suggested that the former (CCN‐controlled) and latter (CCN‐uncontrolled) data generally corresponded to clouds consisting of supercooled water droplets and those containing ice particles, respectively. The CCN‐controlled data persistently appeared throughout the year at Zeppelin. The aerosol‐cloud interaction index (ACI = dlnNc/(3dlnN70)) for the CCN‐controlled data showed high sensitivities to aerosols both in the summer (clean air) and winter–spring (Arctic haze) seasons (0.22 ± 0.03 and 0.25 ± 0.02, respectively). The air parcel model calculations generally reproduced these values. The threshold diameters of aerosol activation (Dact), which account for the Nc of the CCN‐controlled data, were as low as 30–50 nm when N70 was less than 30 cm−3, suggesting that new particle formation can affect Arctic cloud microphysics. |
format |
Article in Journal/Newspaper |
author |
Ove Hermansen C. A. Pedersen Masataka Shiobara Angelo Lupi Vito Vitale Jinro Ukita Johan Ström Peter Tunved Christoph Ritter Darrel Baumgardner Makoto Koike K. Yamada |
author_facet |
Ove Hermansen C. A. Pedersen Masataka Shiobara Angelo Lupi Vito Vitale Jinro Ukita Johan Ström Peter Tunved Christoph Ritter Darrel Baumgardner Makoto Koike K. Yamada |
author_sort |
Ove Hermansen |
title |
Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols |
title_short |
Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols |
title_full |
Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols |
title_fullStr |
Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols |
title_full_unstemmed |
Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships With Aerosols |
title_sort |
year‐round in situ measurements of arctic low‐level clouds: microphysical properties and their relationships with aerosols |
publishDate |
2019 |
url |
https://www.openaccessrepository.it/record/91947 https://doi.org/10.1029/2018jd029802 |
long_lat |
ENVELOPE(-61.480,-61.480,-64.444,-64.444) |
geographic |
Arctic Mount Zeppelin Ny-Ålesund |
geographic_facet |
Arctic Mount Zeppelin Ny-Ålesund |
genre |
Arctic Ny Ålesund Ny-Ålesund Spitsbergen |
genre_facet |
Arctic Ny Ålesund Ny-Ålesund Spitsbergen |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/91947 doi:10.1029/2018jd029802 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1029/2018jd029802 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
124 |
container_issue |
3 |
container_start_page |
1798 |
op_container_end_page |
1822 |
_version_ |
1780730065385947136 |