Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)

Cirrus is the only cloud type capable of inducing daytime cooling or heating at the top of the atmosphere (TOA) and the sign of its radiative effect highly depends on its optical depth. However, the investigation of its geometrical and optical properties over the Arctic is limited. In this work the...

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Autores principales:	Konstantina Nakoudi, Christoph Ritter, Iwona S. Stachlewska
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Arctic clouds cirrus clouds ice clouds lidar Science Q
Acceso en línea:	https://doaj.org/article/6ac77e270f7649ceb3e4415d38454995
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id	oai:doaj.org-article:6ac77e270f7649ceb3e4415d38454995
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spelling	oai:doaj.org-article:6ac77e270f7649ceb3e4415d384549952021-11-25T18:54:11ZProperties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)10.3390/rs132245552072-4292https://doaj.org/article/6ac77e270f7649ceb3e4415d384549952021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4555https://doaj.org/toc/2072-4292Cirrus is the only cloud type capable of inducing daytime cooling or heating at the top of the atmosphere (TOA) and the sign of its radiative effect highly depends on its optical depth. However, the investigation of its geometrical and optical properties over the Arctic is limited. In this work the long-term properties of cirrus clouds are explored for the first time over an Arctic site (Ny-Ålesund, Svalbard) using lidar and radiosonde measurements from 2011 to 2020. The optical properties were quality assured, taking into account the effects of specular reflections and multiple-scattering. Cirrus clouds were generally associated with colder and calmer wind conditions compared to the 2011–2020 climatology. However, the dependence of cirrus properties on temperature and wind speed was not strong. Even though the seasonal cycle was not pronounced, the winter-time cirrus appeared under lower temperatures and stronger wind conditions. Moreover, in winter, geometrically- and optically-thicker cirrus were found and their ice particles tended to be more spherical. The majority of cirrus was associated with westerly flow and westerly cirrus tended to be geometrically-thicker. Overall, optically-thinner layers tended to comprise smaller and less spherical ice crystals, most likely due to reduced water vapor deposition on the particle surface. Compared to lower latitudes, the cirrus layers over Ny-Ålesund were more absorbing in the visible spectral region and they consisted of more spherical ice particles.Konstantina NakoudiChristoph RitterIwona S. StachlewskaMDPI AGarticleArctic cloudscirrus cloudsice cloudslidarScienceQENRemote Sensing, Vol 13, Iss 4555, p 4555 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Arctic clouds cirrus clouds ice clouds lidar Science Q
spellingShingle	Arctic clouds cirrus clouds ice clouds lidar Science Q Konstantina Nakoudi Christoph Ritter Iwona S. Stachlewska Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)
description	Cirrus is the only cloud type capable of inducing daytime cooling or heating at the top of the atmosphere (TOA) and the sign of its radiative effect highly depends on its optical depth. However, the investigation of its geometrical and optical properties over the Arctic is limited. In this work the long-term properties of cirrus clouds are explored for the first time over an Arctic site (Ny-Ålesund, Svalbard) using lidar and radiosonde measurements from 2011 to 2020. The optical properties were quality assured, taking into account the effects of specular reflections and multiple-scattering. Cirrus clouds were generally associated with colder and calmer wind conditions compared to the 2011–2020 climatology. However, the dependence of cirrus properties on temperature and wind speed was not strong. Even though the seasonal cycle was not pronounced, the winter-time cirrus appeared under lower temperatures and stronger wind conditions. Moreover, in winter, geometrically- and optically-thicker cirrus were found and their ice particles tended to be more spherical. The majority of cirrus was associated with westerly flow and westerly cirrus tended to be geometrically-thicker. Overall, optically-thinner layers tended to comprise smaller and less spherical ice crystals, most likely due to reduced water vapor deposition on the particle surface. Compared to lower latitudes, the cirrus layers over Ny-Ålesund were more absorbing in the visible spectral region and they consisted of more spherical ice particles.
format	article
author	Konstantina Nakoudi Christoph Ritter Iwona S. Stachlewska
author_facet	Konstantina Nakoudi Christoph Ritter Iwona S. Stachlewska
author_sort	Konstantina Nakoudi
title	Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)
title_short	Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)
title_full	Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)
title_fullStr	Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)
title_full_unstemmed	Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)
title_sort	properties of cirrus clouds over the european arctic (ny-ålesund, svalbard)
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6ac77e270f7649ceb3e4415d38454995
work_keys_str_mv	AT konstantinanakoudi propertiesofcirruscloudsovertheeuropeanarcticnyalesundsvalbard AT christophritter propertiesofcirruscloudsovertheeuropeanarcticnyalesundsvalbard AT iwonasstachlewska propertiesofcirruscloudsovertheeuropeanarcticnyalesundsvalbard
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Properties of Cirrus Clouds over the European Arctic (Ny-Ålesund, Svalbard)

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