Journal Article

FZJ-2019-03059

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High Depolarization Ratios of Naturally Occurring Cirrus Clouds Near Air Traffic Regions Over Europe

Urbanek, B. (Corresponding author) ; Groß, S. ; Wirth, M. ; Rolf, C.FZJ* ; Krämer, M.FZJ* ; Voigt, C.

2018
Wiley Hoboken, NJ

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Please use a persistent id in citations: http://hdl.handle.net/2128/22213  http://hdl.handle.net/2128/22814  doi:10.1029/2018GL079345

Abstract: Cirrus clouds have a large influence on the Earth's climate and anthropogenic activities such as aviation can alter their properties. Besides the formation of contrails, indirect effects on naturally occurring cirrus like increased heterogeneous freezing due to exhaust soot particles are discussed in the literature. However, hardly any observational study exists. In this work we present cirrus optical properties measured by an airborne lidar over Europe during the Midlatitude Cirrus experiment (ML‐CIRRUS). One half of the cloud cases showed elevated depolarization ratios with a mode difference of 10 percentage points indicating differences in the clouds microphysical properties. Their origin can be traced back to highly frequented air traffic regions, and they show lower in‐cloud ice supersaturations. Our analysis reveals no influence of embedded contrails and temperature. These results could be explained by an indirect aerosol effect where heterogeneous freezing is caused by aviation exhaust particles.

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Contributing Institute(s):

1. Stratosphäre (IEK-7)

Research Program(s):

1. 244 - Composition and dynamics of the upper troposphere and middle atmosphere (POF3-244) (POF3-244)

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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