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https://doi.org/10.5194/amt-2017-46
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
05 Apr 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
A tandem approach for collocated in-situ measurements of microphysical and radiative cirrus properties
Marcus Klingebiel1,2, André Ehrlich3, Fanny Finger3, Timo Röschenthaler4,5, Suad Jakirlić5, Matthias Voigt6, Stefan Müller4,6, Rolf Maser4, Manfred Wendisch3, Peter Hoor6, Peter Spichtinger6, and Stephan Borrmann2,6 1Max Planck Institute for Meteorology, Atmosphere in the Earth System Department, Hamburg, Germany
2Max Planck Institute for Chemistry, Particle Chemistry Department, Mainz, Germany
3Leipzig Institute for Meteorology (LIM), University of Leipzig, Leipzig, Germany
4Enviscope GmbH, Frankfurt, Germany
5Institute for Fluid Mechanics and Aerodynamics, Darmstadt University of Technology, Darmstadt, Germany
6Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
Abstract. Microphysical and radiation measurements were collected with the unique AIRcraft TOwed Sensor Shuttle (AIRTOSS) – Learjet tandem platform. It is a combination of a Learjet 35A research aircraft and an instrumented aerodynamic body, which can be detached from and retracted back to the aircraft during flight. Both platforms are equipped with radiative, cloud microphysical, trace gas (CO, N2O, O3 and H2O) and meteorological instruments to study the inhomogeneity of cirrus as well as other layer clouds. Sophisticated numerical flow simulations were conducted in advance in order to optimally integrate a Cloud Combination Probe (CCP) inside the AIRTOSS. The tandem platform was used for the first time at altitudes up to 36 000 ft (10 970 m) during the AIRTOSS – Inhomogeneous Cirrus Experiment (AIRTOSS-ICE). AIRTOSS is connected to the aircraft by a steel wire with a length of 4000 m. Ten flights were performed above the North Sea and Baltic Sea to probe frontal cirrus, in-situ formed cirrus, and anvil outflow cirrus. The cirrus microphysical and radiative properties displayed significant inhomogeneities resolved by both measurement platforms. Data collected with the CCP show that the maximum of the observed particle number size distribu- tions shifts with increasing altitude from 300 μm to 30  μm, which is typical for frontal, midlatitude cirrus. Theoretical considerations imply that cloud particle aggregation inside the studied cirrus is very unlikely. Consequently, diffusional growth was identified to be the dominant microphysical process. Measurements of solar downward irradiance at 670 nm wavelength on the Learjet and the sensor shuttle indicate a significant horizontal heterogeneity of the observed thin cirrus. Making use of the collocated irradiance measurements of the tandem platform, vertically resolved solar heating rates were derived. They varied by up to 6 K day−1 in and above the cirrus layer.

Citation: Klingebiel, M., Ehrlich, A., Finger, F., Röschenthaler, T., Jakirlić, S., Voigt, M., Müller, S., Maser, R., Wendisch, M., Hoor, P., Spichtinger, P., and Borrmann, S.: A tandem approach for collocated in-situ measurements of microphysical and radiative cirrus properties, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-46, in review, 2017.
Marcus Klingebiel et al.
Marcus Klingebiel et al.
Marcus Klingebiel et al.

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Short summary
Microphysical and radiation measurements were collected with the unique AIRcraft TOwed Sensor Shuttle (AIRTOSS) – Learjet tandem platform. It is a combination of a Learjet 35A research aircraft and an instrumented aerodynamic body, which can be detached from and retracted back to the aircraft during flight. AIRTOSS and Learjet are equipped with radiative, cloud microphysical, trace gas and meteorological instruments to study Cirrus-Clouds.
Microphysical and radiation measurements were collected with the unique AIRcraft TOwed Sensor...
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