Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand
An 11-year dataset from a polarization lidar operated by NIWA at Lauder was used to investigate heterogeneous ice formation in clouds as a function of temperature for a site on the South Island of New Zealand. Trajectory-based tools and model data were used to relate this cloud dataset to the aeroso...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5018291 2023-10-01T03:52:10+02:00 Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand Hofer, J. Seifert, P. Liley, B. Uchino, O. Morino, I. Sakai, T. Nagai, T. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018291 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-2458 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018291 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-2458 2023-09-03T23:42:28Z An 11-year dataset from a polarization lidar operated by NIWA at Lauder was used to investigate heterogeneous ice formation in clouds as a function of temperature for a site on the South Island of New Zealand. Trajectory-based tools and model data were used to relate this cloud dataset to the aerosol load and air mass sources, as aerosol conditions in the middle troposphere above Lauder are subject to contrasts. Clean, pristine airmasses from Antarctica and the Southern Ocean arrive under southerly flow conditions while elevated aerosol loads occur when air masses are advected from nearby Australia. The Lauder cloud dataset was put into context with lidar studies from contrasting regions such as Germany and southern Chile. The ice-formation efficiency found at Lauder is lower than in polluted mid-latitudes (i.e., Germany) but higher than in southern Chile. Both, Lauder and southern Chile are subject to generally low free-tropospheric aerosol loads, which suggests that the low ice-formation efficiency at these two sites is related to low ice-nucleating particle (INP) concentrations. However, Lauder sees episodes of continental aerosol, more than does southern Chile, what seems to lead to the moderately increased ice-formation efficiency. Trajectory-based tools and aerosol model reanalyses were used to relate the cloud dataset to the aerosol load and the air mass sources. Both analyses point clearly to higher ice formation efficiency for clouds which are more strongly influenced by continental aerosol, and to lower ice formation efficiency for clouds which are more influenced by Antarctic/marine aerosol and air masses. Conference Object Antarc* Antarctic Antarctica Southern Ocean GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Southern Ocean New Zealand |
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Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
An 11-year dataset from a polarization lidar operated by NIWA at Lauder was used to investigate heterogeneous ice formation in clouds as a function of temperature for a site on the South Island of New Zealand. Trajectory-based tools and model data were used to relate this cloud dataset to the aerosol load and air mass sources, as aerosol conditions in the middle troposphere above Lauder are subject to contrasts. Clean, pristine airmasses from Antarctica and the Southern Ocean arrive under southerly flow conditions while elevated aerosol loads occur when air masses are advected from nearby Australia. The Lauder cloud dataset was put into context with lidar studies from contrasting regions such as Germany and southern Chile. The ice-formation efficiency found at Lauder is lower than in polluted mid-latitudes (i.e., Germany) but higher than in southern Chile. Both, Lauder and southern Chile are subject to generally low free-tropospheric aerosol loads, which suggests that the low ice-formation efficiency at these two sites is related to low ice-nucleating particle (INP) concentrations. However, Lauder sees episodes of continental aerosol, more than does southern Chile, what seems to lead to the moderately increased ice-formation efficiency. Trajectory-based tools and aerosol model reanalyses were used to relate the cloud dataset to the aerosol load and the air mass sources. Both analyses point clearly to higher ice formation efficiency for clouds which are more strongly influenced by continental aerosol, and to lower ice formation efficiency for clouds which are more influenced by Antarctic/marine aerosol and air masses. |
format |
Conference Object |
author |
Hofer, J. Seifert, P. Liley, B. Uchino, O. Morino, I. Sakai, T. Nagai, T. |
spellingShingle |
Hofer, J. Seifert, P. Liley, B. Uchino, O. Morino, I. Sakai, T. Nagai, T. Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand |
author_facet |
Hofer, J. Seifert, P. Liley, B. Uchino, O. Morino, I. Sakai, T. Nagai, T. |
author_sort |
Hofer, J. |
title |
Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand |
title_short |
Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand |
title_full |
Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand |
title_fullStr |
Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand |
title_full_unstemmed |
Aerosol-related effects on the occurrence of heterogeneous ice formation over Lauder, New Zealand |
title_sort |
aerosol-related effects on the occurrence of heterogeneous ice formation over lauder, new zealand |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018291 |
geographic |
Antarctic Southern Ocean New Zealand |
geographic_facet |
Antarctic Southern Ocean New Zealand |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-2458 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018291 |
op_doi |
https://doi.org/10.57757/IUGG23-2458 |
_version_ |
1778517871856451584 |