Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations
A novel new approach to retrieve cloud microphysical properties from mixed-phase clouds is presented. This algorithm retrieves cloud optical depth, ice fraction, and the effective size of the water and ice particles from ground-based, high-resolution infrared radiance observations. The theoretical b...
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ftosti:oai:osti.gov:1000181 2023-07-30T04:01:00+02:00 Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations Turner, David D. 2016-11-15 application/pdf http://www.osti.gov/servlets/purl/1000181 https://www.osti.gov/biblio/1000181 https://doi.org/10.2172/1000181 unknown http://www.osti.gov/servlets/purl/1000181 https://www.osti.gov/biblio/1000181 https://doi.org/10.2172/1000181 doi:10.2172/1000181 54 ENVIRONMENTAL SCIENCES ARCTIC REGIONS CLOUDS PHYSICAL PROPERTIES ALGORITHMS ICE PARTICLE SIZE DROPLETS SORPTIVE PROPERTIES OPTICAL PROPERTIES SEASONAL VARIATIONS PHASE STUDIES 2016 ftosti https://doi.org/10.2172/1000181 2023-07-11T08:49:25Z A novel new approach to retrieve cloud microphysical properties from mixed-phase clouds is presented. This algorithm retrieves cloud optical depth, ice fraction, and the effective size of the water and ice particles from ground-based, high-resolution infrared radiance observations. The theoretical basis is that the absorption coefficient of ice is stronger than that of liquid water from 10-13 mm, whereas liquid water is more absorbing than ice from 16-25 um. However, due to strong absorption in the rotational water vapor absorption band, the 16-25 um spectral region becomes opaque for significant water vapor burdens (i.e., for precipitable water vapor amounts over approximately 1 cm). The Arctic is characterized by its dry and cold atmosphere, as well as a preponderance of mixed-phase clouds, and thus this approach is applicable to Arctic clouds. Since this approach uses infrared observations, cloud properties are retrieved at night and during the long polar wintertime period. The analysis of the cloud properties retrieved during a 7 month period during the Surface Heat Budget of the Arctic (SHEBA) experiment demonstrates many interesting features. These results show a dependence of the optical depth on cloud phase, differences in the mode radius of the water droplets in liquid-only and mid-phase clouds, a lack of temperature dependence in the ice fraction for temperatures above 240 K, seasonal trends in the optical depth with the clouds being thinner in winter and becoming more optically thick in the late spring, and a seasonal trend in the effective size of the water droplets in liquid-only and mixed-phase clouds that is most likely related to aerosol concentration. Other/Unknown Material Arctic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
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topic |
54 ENVIRONMENTAL SCIENCES ARCTIC REGIONS CLOUDS PHYSICAL PROPERTIES ALGORITHMS ICE PARTICLE SIZE DROPLETS SORPTIVE PROPERTIES OPTICAL PROPERTIES SEASONAL VARIATIONS PHASE STUDIES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES ARCTIC REGIONS CLOUDS PHYSICAL PROPERTIES ALGORITHMS ICE PARTICLE SIZE DROPLETS SORPTIVE PROPERTIES OPTICAL PROPERTIES SEASONAL VARIATIONS PHASE STUDIES Turner, David D. Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations |
topic_facet |
54 ENVIRONMENTAL SCIENCES ARCTIC REGIONS CLOUDS PHYSICAL PROPERTIES ALGORITHMS ICE PARTICLE SIZE DROPLETS SORPTIVE PROPERTIES OPTICAL PROPERTIES SEASONAL VARIATIONS PHASE STUDIES |
description |
A novel new approach to retrieve cloud microphysical properties from mixed-phase clouds is presented. This algorithm retrieves cloud optical depth, ice fraction, and the effective size of the water and ice particles from ground-based, high-resolution infrared radiance observations. The theoretical basis is that the absorption coefficient of ice is stronger than that of liquid water from 10-13 mm, whereas liquid water is more absorbing than ice from 16-25 um. However, due to strong absorption in the rotational water vapor absorption band, the 16-25 um spectral region becomes opaque for significant water vapor burdens (i.e., for precipitable water vapor amounts over approximately 1 cm). The Arctic is characterized by its dry and cold atmosphere, as well as a preponderance of mixed-phase clouds, and thus this approach is applicable to Arctic clouds. Since this approach uses infrared observations, cloud properties are retrieved at night and during the long polar wintertime period. The analysis of the cloud properties retrieved during a 7 month period during the Surface Heat Budget of the Arctic (SHEBA) experiment demonstrates many interesting features. These results show a dependence of the optical depth on cloud phase, differences in the mode radius of the water droplets in liquid-only and mid-phase clouds, a lack of temperature dependence in the ice fraction for temperatures above 240 K, seasonal trends in the optical depth with the clouds being thinner in winter and becoming more optically thick in the late spring, and a seasonal trend in the effective size of the water droplets in liquid-only and mixed-phase clouds that is most likely related to aerosol concentration. |
author |
Turner, David D. |
author_facet |
Turner, David D. |
author_sort |
Turner, David D. |
title |
Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations |
title_short |
Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations |
title_full |
Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations |
title_fullStr |
Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations |
title_full_unstemmed |
Microphysical Properties of Single and Mixed-Phase Arctic Clouds Derived from AERI Observations |
title_sort |
microphysical properties of single and mixed-phase arctic clouds derived from aeri observations |
publishDate |
2016 |
url |
http://www.osti.gov/servlets/purl/1000181 https://www.osti.gov/biblio/1000181 https://doi.org/10.2172/1000181 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://www.osti.gov/servlets/purl/1000181 https://www.osti.gov/biblio/1000181 https://doi.org/10.2172/1000181 doi:10.2172/1000181 |
op_doi |
https://doi.org/10.2172/1000181 |
_version_ |
1772811710325850112 |