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Contrail study with ground-based cameras

Schumann, Ulrich and Hempel, Rolf and Flentje, Harald and Garhammer, Markus and Graf, Kaspar and Kox, Stephan and Lösslein, H. and Mayer, Bernhard (2013) Contrail study with ground-based cameras. Atmospheric Measurement Techniques, pp. 3597-3612. Copernicus Publications. DOI: 10.5194/amt-6-3597-2013 ISSN 1867-1381

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Official URL: http://www.atmos-meas-tech.net/6/3597/2013/amt-6-3597-2013.html

Abstract

Photogrammetric methods and analysis results for contrails observed with wide-angle cameras are described. Four cameras of two different types (view angle < 90° or whole-sky imager) at the ground at various positions are used to track contrails and to derive their altitude, width, and horizontal speed. Camera models for both types are described to derive the observation angles for given image coordinates and their inverse. The models are calibrated with sightings of the Sun, the Moon and a few bright stars. The methods are applied and tested in a case study. Four persistent contrails crossing each other together with a short-lived one are observed with the cameras. Vertical and horizontal positions of the contrails are determined from the camera images to an accuracy of better than 200 m and horizontal speed to 0.2 m s−1. With this information, the aircraft causing the contrails are identified by comparison to traffic waypoint data. The observations are compared with synthetic camera pictures of contrails simulated with the contrail prediction model CoCiP, a Lagrangian model using air traffic movement data and numerical weather prediction (NWP) data as input. The results provide tests for the NWP and contrail models. The cameras show spreading and thickening contrails suggesting ice-supersaturation in the ambient air. The ice-supersaturated layer is found thicker and more humid in this case than predicted by the NWP model used. The simulated and observed contrail positions agree up to differences caused by uncertain wind data. The contrail widths, which depend on wake vortex spreading, ambient shear and turbulence, were partly wider than simulated.

Item URL in elib:https://elib.dlr.de/86509/
Document Type:Article
Title:Contrail study with ground-based cameras
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schumann, UlrichDLR, IPAUNSPECIFIED
Hempel, RolfDLR, SC-LtgUNSPECIFIED
Flentje, HaraldDWD, HohenpeissenbergUNSPECIFIED
Garhammer, MarkusLMU, MünchenUNSPECIFIED
Graf, KasparDLR, IPAUNSPECIFIED
Kox, StephanDLR, IPAUNSPECIFIED
Lösslein, H.LMU, MünchenUNSPECIFIED
Mayer, BernhardLMU, MünchenUNSPECIFIED
Date:2013
Journal or Publication Title:Atmospheric Measurement Techniques
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.5194/amt-6-3597-2013
Page Range:pp. 3597-3612
Publisher:Copernicus Publications
ISSN:1867-1381
Status:Published
Keywords:contrails, CoCiP, ice-supersaturation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old), L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation, L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Climate, Weather and Environment (old), L - Air Traffic and Weather (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Atmospheric Remote Sensing
Institut of Simulation and Software Technology > Leitungsbereich SC
Deposited By: Ziegele, Brigitte
Deposited On:10 Dec 2013 16:12
Last Modified:02 May 2019 14:13

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