Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing
The vertical distribution of ice crystals in Arctic boundary-layer mixed-phase (ABM) clouds was investigated by airborne remote-sensing and in situ measurements during the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) campaign in March and April 2007. Information on the spectral...
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2009
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ftdoajarticles:oai:doaj.org/article:9d3e27a24fb641fa8bad892471d90174 2023-05-15T14:54:17+02:00 Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing B. Mayer A. Lampert G. Mioche J.-F. Gayet E. Bierwirth M. Wendisch A. Ehrlich 2009-12-01T00:00:00Z https://doaj.org/article/9d3e27a24fb641fa8bad892471d90174 EN eng Copernicus Publications http://www.atmos-chem-phys.net/9/9401/2009/acp-9-9401-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/9d3e27a24fb641fa8bad892471d90174 Atmospheric Chemistry and Physics, Vol 9, Iss 24, Pp 9401-9416 (2009) Physics QC1-999 Chemistry QD1-999 article 2009 ftdoajarticles 2022-12-31T02:59:54Z The vertical distribution of ice crystals in Arctic boundary-layer mixed-phase (ABM) clouds was investigated by airborne remote-sensing and in situ measurements during the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) campaign in March and April 2007. Information on the spectral absorption of solar radiation by ice and liquid water cloud particles is derived from airborne measurements of solar spectral radiation reflected by these clouds. It is shown by calculation of the vertical weighting function of the measurements that the observed absorption of solar radiation is dominated by the upper cloud layers (50% within 200 m from cloud top). This vertical weighting function is shifted even closer to cloud top for wavelengths where absorption by ice dominates. On this basis an indicator of the vertical distribution of ice crystals in ABM clouds is designed. Applying in situ measured microphysical properties, the cloud-top reflectivity was calculated by radiative transfer simulations and compared to the measurements. It is found that ice crystals near cloud top (mixed-phase cloud top layer) are necessary to reproduce the measurements at wavelengths where absorption by ice dominates. The observation of backscatter glories on the cloud top generally indicating liquid water droplets does not contradict the postulated presence of ice crystals. Radiative transfer simulations reproduce the observed glories even if the cloud top layer is of mixed-phase character. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic |
institution |
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 B. Mayer A. Lampert G. Mioche J.-F. Gayet E. Bierwirth M. Wendisch A. Ehrlich Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The vertical distribution of ice crystals in Arctic boundary-layer mixed-phase (ABM) clouds was investigated by airborne remote-sensing and in situ measurements during the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) campaign in March and April 2007. Information on the spectral absorption of solar radiation by ice and liquid water cloud particles is derived from airborne measurements of solar spectral radiation reflected by these clouds. It is shown by calculation of the vertical weighting function of the measurements that the observed absorption of solar radiation is dominated by the upper cloud layers (50% within 200 m from cloud top). This vertical weighting function is shifted even closer to cloud top for wavelengths where absorption by ice dominates. On this basis an indicator of the vertical distribution of ice crystals in ABM clouds is designed. Applying in situ measured microphysical properties, the cloud-top reflectivity was calculated by radiative transfer simulations and compared to the measurements. It is found that ice crystals near cloud top (mixed-phase cloud top layer) are necessary to reproduce the measurements at wavelengths where absorption by ice dominates. The observation of backscatter glories on the cloud top generally indicating liquid water droplets does not contradict the postulated presence of ice crystals. Radiative transfer simulations reproduce the observed glories even if the cloud top layer is of mixed-phase character. |
format |
Article in Journal/Newspaper |
author |
B. Mayer A. Lampert G. Mioche J.-F. Gayet E. Bierwirth M. Wendisch A. Ehrlich |
author_facet |
B. Mayer A. Lampert G. Mioche J.-F. Gayet E. Bierwirth M. Wendisch A. Ehrlich |
author_sort |
B. Mayer |
title |
Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing |
title_short |
Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing |
title_full |
Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing |
title_fullStr |
Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing |
title_full_unstemmed |
Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing |
title_sort |
evidence of ice crystals at cloud top of arctic boundary-layer mixed-phase clouds derived from airborne remote sensing |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doaj.org/article/9d3e27a24fb641fa8bad892471d90174 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 9, Iss 24, Pp 9401-9416 (2009) |
op_relation |
http://www.atmos-chem-phys.net/9/9401/2009/acp-9-9401-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/9d3e27a24fb641fa8bad892471d90174 |
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1766326003942031360 |