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Aircraft icing research flights in embedded convection

Hauf, T. and Schröder, F. (2006) Aircraft icing research flights in embedded convection. Meteorology and Atmospheric Physics, 91, pp. 247-265. Springer. DOI: 10.1007/s00703-004-0082-y

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Abstract

Results from in-cloud measurements with an instrumented ircraft from an icing research campaign in Southern Germany in March 1997 are presented. Measurements with conventional optical cloud probes and of the ice accretion on a cylinder exposed to the flow show the existence of supercooled large drops (SLD) in the size range up to 300 mm simultaneously with severe icing with ice-accretion rates of up to 3.5mmmin-1. Nearly all periods with icing, including the ones with severe icing, occurred in mixed-phase convective cells embedded in surrounding stratus clouds. The spatial scales of SLD occurrence, respectively severe icing, ranged between several hundred meters and some kilometers and correspond to the length of the transects through the embedded cells. SLD formed through the coalescence process and were found through the whole cloud depth pointing to a source region near cloud top, in line with the arguments of Rauber and Tokay (1991). No indication of icemultiplication by the Hallet-Mossop process was found, despite of the favorable temperatures for that process. Comparisons of the measured amount of accreted ice with the observed cloud-particle size distributions quite surprisingly indicate that ice accretion is mostly caused by 10–30 mm sized drops rather than by SLD. The latter, therefore, appear to be a by-product of a hypothesized liquid water accumulation zone near cloud top which is also the primary cause of the observed severe ice accretion. The results confirm the importance of embedded convection and of mixed phase clouds with high amounts of liquid water and simultaneously occurring SLD.

Item URL in elib:https://elib.dlr.de/63178/
Document Type:Article
Title:Aircraft icing research flights in embedded convection
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hauf, T.Univ. Hannover, HannoverUNSPECIFIED
Schröder, F.DLRUNSPECIFIED
Date:2006
Journal or Publication Title:Meteorology and Atmospheric Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:91
DOI :10.1007/s00703-004-0082-y
Page Range:pp. 247-265
Publisher:Springer
Status:Published
Keywords:SLD, icing
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: Freund, Jana
Deposited On:22 Feb 2010 14:04
Last Modified:31 Jul 2019 19:27

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