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Publications (3 of 3) Show all publications
Wolf, V., Kuhn, T., Milz, M., Völger, P., Krämer, M. & Rolf, C. (2018). Arctic ice clouds over northern Sweden: microphysical properties studied with the Balloon-borne Ice Cloud particle Imager B-ICI. Atmospheric Chemistry And Physics, 18(23), 17371-17386
Open this publication in new window or tab >>Arctic ice clouds over northern Sweden: microphysical properties studied with the Balloon-borne Ice Cloud particle Imager B-ICI
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2018 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 18, no 23, p. 17371-17386Article in journal (Refereed) Published
Abstract [en]

Ice particle and cloud properties such as particle size, particle shape and number concentration influence the net radiation effect of cirrus clouds. Measurements of these features are of great interest for the improvement of weather and climate models, especially for the Arctic region. In this study, balloon-borne in situ measurements of Arctic cirrus clouds have been analysed for the first time with respect to their origin. Eight cirrus cloud measurements have been carried out in Kiruna (68 N), Sweden, using the Balloon-borne Ice Cloud particle Imager (B-ICI). Ice particle diameters between 10 and 1200 µm have been found and the shape could be recognized from 20 µm upwards. Great variability in particle size and shape is observed. This cannot simply be explained by local environmental conditions. However, if sorted by cirrus origin, wind and weather conditions, the observed differences can be assessed. Number concentrations between 3 and 400 L−1 have been measured, but the number concentration has reached values above 100 L−1 only for two cases. These two cirrus clouds are of in situ origin and have been associated with waves. For all other measurements, the maximum ice particle concentration is below 50 L−1 and for one in situ origin cirrus case only 3 L−1. In the case of in situ origin clouds, the particles are all smaller than 350 µm diameter. The PSDs for liquid origin clouds are much broader with particle sizes between 10 and 1200 µm. Furthermore, it is striking that in the case of in situ origin clouds almost all particles are compact (61 %) or irregular (25 %) when examining the particle shape. In liquid origin clouds, on the other hand, most particles are irregular (48 %), rosettes (25 %) or columnar (14 %). There are hardly any plates in cirrus regardless of their origin. It is also noticeable that in the case of liquid origin clouds the rosettes and columnar particles are almost all hollow.

Place, publisher, year, edition, pages
Copernicus Publications, 2018
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-72316 (URN)10.5194/acp-18-17371-2018 (DOI)000452384100002 ()2-s2.0-85058149311 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-01-08 (johcin)

Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2019-01-08Bibliographically approved
Kuhn, T., Wolf, V., Völger, P., Stanev, M. & Gumbel, J. (2017). Comparison of In-Situ Balloon-Borne and Lidar Measurement of Cirrus Clouds. In: Proceedings of the 23rd ESA Symposium on European Rocket and Balloon Programmes and Related Research: . Paper presented at 23rd ESA Symposium on European Rocket and Balloon Programmes and Related Research, Visby, 11-15 June 2017. Noordwijk, The Netherlands, Article ID A-091kuhn.
Open this publication in new window or tab >>Comparison of In-Situ Balloon-Borne and Lidar Measurement of Cirrus Clouds
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2017 (English)In: Proceedings of the 23rd ESA Symposium on European Rocket and Balloon Programmes and Related Research, Noordwijk, The Netherlands, 2017, article id A-091kuhnConference paper, Published paper (Other academic)
Abstract [en]

A series of in-situ balloon-borne experiments con- ducted at Kiruna, Sweden (68°N), is studying upper- tropospheric, cold ice clouds in arctic latitudes. Ex- periments are launched from Esrange Space Center and collect ice particles with an in-situ imaging instrument. One of the aims with these measurements is to improve satellite remote sensing of cold ice clouds. Such clouds can be observed by lidar. Therefore, when possible, concurrent ground-based lidar measurements have been carried out with two available lidar systems to accom- pany the balloon-borne measurements. The Esrange lidar is located at Esrange Space Center, approximately 500 m from the in-situ launch site on the balloon pad; the IRF lidar is located about 29 km to the west of Esrange Space Center (operated by the Swedish Institute of Space Physics, IRF). Here we present results from these lidar measurements and compare them to ice particle proper- ties determined during the in-situ measurements. 

Place, publisher, year, edition, pages
Noordwijk, The Netherlands: , 2017
Keywords
Cirrus; ice clouds; lidar; ice particles; in-situ; balloon-borne; Arctic; high latitude measurements
National Category
Natural Sciences Earth and Related Environmental Sciences Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-66461 (URN)
Conference
23rd ESA Symposium on European Rocket and Balloon Programmes and Related Research, Visby, 11-15 June 2017
Funder
Swedish National Space Board
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2018-05-16Bibliographically approved
Ekman, J., Antti, M.-L., Martin-Torres, J., Emami, R., Törlind, P., Kuhn, T., . . . Fakhardji, W. (2015). Projekt: Rymdforskarskolan. Paper presented at .
Open this publication in new window or tab >>Projekt: Rymdforskarskolan
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2015 (English)Other (Other (popular science, discussion, etc.))
Abstract [en]

The Graduate School of Space Technology

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Other Materials Engineering Aerospace Engineering Other Engineering and Technologies not elsewhere specified Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Chemical Process Engineering
Research subject
Industrial Electronics; Engineering Materials; Atmospheric science; Onboard space systems; Product Innovation; Machine Elements; Chemical Technology; Entrepreneurship and Innovation
Identifiers
urn:nbn:se:ltu:diva-36154 (URN)8c1c49e5-8fd1-4b50-992e-abd48bc5619c (Local ID)8c1c49e5-8fd1-4b50-992e-abd48bc5619c (Archive number)8c1c49e5-8fd1-4b50-992e-abd48bc5619c (OAI)
Note

Publikationer: Opportunities and Challenges for Additive Manufacturing in Space Applications; Status: Ongoing; Period: 01/01/2015 → …; End date: 31/12/2018

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-05-18Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0071-5415

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