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In-situ ice particle measurements over northern Sweden
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
National Center for Atmospheric Research, Boulder, Colorado.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.ORCID iD: 0000-0001-6389-1160
2012 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

ce clouds play an important role in the energy budget of the atmosphere. They are at high altitudes, absorb longwave radiation from below and, as they are cold, emit little infrared radiation. This greenhouse effect warms the Earth-atmosphere system. On the other hand, ice clouds have a cooling effect by reflecting incoming solar short wave radiation. The net effect is crucial for the atmosphere, but will depend highly on the cloud’s horizontal extent, vertical position, ice water content (IWC), and ice particle microphysical properties such as size and shape. A series of in-situ balloon measurements has been started at Kiruna, Sweden, which is located at 68°N. Fewer in- situ ice cloud measurements exist at these high latitudes compared to mid- or tropical latitudes. Also temperatures in the upper troposphere can be around -60 °C, a temperature range under-represented in available in-situ data. Ice particles are collected with a balloon-borne replicator launched from Esrange Space Center (near Kiruna, Sweden). Measurements are complemented by a radiosonde added to the instrument. The shape and size as well as IWC are determined from the replicas. The data are analyzed to reveal relationships between IWC and other measurements such as temperature and volume extinction coefficient. Such relationships can be used for validation and improvement of satellite retrievals of IWC from, for example, thin cirrus measurements with satellite-borne lidar.

Place, publisher, year, edition, pages
2012.
Keyword [en]
ice clouds, ice water content, Earth sciences - Atmosphere and hydrosphere sciences
Keyword [sv]
Geovetenskap - Atmosfärs- och hydrosfärsvetenskap
National Category
Aerospace Engineering
Research subject
Space Technology
Identifiers
URN: urn:nbn:se:ltu:diva-27493Local ID: 0f75d759-f802-4bc5-9214-4d176e210d41OAI: oai:DiVA.org:ltu-27493DiVA: diva2:1000677
Conference
EGU General Assembly 2012 : 23/04/2012 - 27/04/2012
Note
Godkänd; 2012; Bibliografisk uppgift: EGU General Assembly 2012, Vienna (Austria), Geophysical Research Abstracts, Vol. 14, EGU2012-13134, 2012; 20130801 (thokuh)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-10-20Bibliographically approved

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http://presentations.copernicus.org/EGU2012-13134_presentation.pdf

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