Efficient Compression of 4D-Trajectory Data in Air Traffic Management

Wandelt, Sebastian; Sun, Xiaoqian

doi:10.1109/tits.2014.2345055

Cited by 14 publications

(10 citation statements)

References 45 publications

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“…As a minimum, the input data must characterize the flight tracks and emissions in the "upper" airspace above flight level (FL) 180 (18 000 feet, about 5.5 km), where most contrails form. Previous CoCiP studies have used air traffic from various sources, including a global track database for 2006 (Wilkerson et al, 2010;Brasseur et al, 2016), data collected for the field experiment ML-CIRRUS over Europe and the North Atlantic in March and April 2014 (Schumann et al, 2016;, or traffic data for 6 weeks distributed over one year in 2012-13 in Japanese airspace (Teoh et al, 2020b). Here, all flights passing the European investigation domain are considered.…”

Section: Air Traffic and Aircraft Emissions Inputmentioning

confidence: 99%

Air traffic and contrail changes over Europe during COVID-19: a model study

et al. 2021

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Abstract. The strong reduction of air traffic during the COVID-19 pandemic provides a unique test case for the relationship between air traffic density, contrails, and their radiative forcing of climate change. Here, air traffic and contrail cirrus changes are quantified for a European domain for March to August 2020 and compared to the same period in 2019. Traffic data show a 72 % reduction in flight distance compared with 2019. This paper investigates the induced contrail changes in a model study. The contrail model results depend on various methodological details as discussed in parameter studies. In the reference case, the reduced traffic caused a reduction in contrail length. The reduction is slightly stronger than expected from the traffic change because the weather conditions in 2020 were less favorable for contrail formation than in 2019. Contrail coverage over Europe with an optical depth larger than 0.1 decreased from 4.6 % in 2019 to 1.4 % in 2020; the total cirrus cover amount changed by 28 % to 25 %. The reduced contrail coverage caused 70 % less longwave and 73 % less shortwave radiative forcing but, because of various nonlinearities, only 54 % less net forcing in this case. The methods include recently developed models for performance parameters and soot emissions. The overall propulsion efficiency of the aircraft is about 20 % smaller than estimated in earlier studies, resulting in 3 % fewer contrails. Considerable sensitivity to soot emissions is found, highlighting fuel and engine importance. The contrail model includes a new approximate method to account for water vapor exchange between contrails and background air and for radiative forcing changes due to contrail–contrail overlap. The water vapor exchange reduces available ice supersaturation in the atmosphere, which is critical for contrail formation. Contrail–contrail overlap changes the computed radiative forcing considerably. Comparisons to satellite observations are described and discussed in a parallel publication.

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Section: Air Traffic and Aircraft Emissions Inputmentioning

confidence: 99%

Air traffic and contrail changes over Europe during COVID-19: a model study

et al. 2021

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“…The CPR represents augmented surveillance position information, based on real-time surveillance data (https://www.eurocontrol.int/service/data-collection-service) derived from radar and from Automatic Dependent Surveillance -Broadcast (ADS-B) data (https://ads-b-europe.eu/). For flights outside the surveillance domain of EUROCONTROL, data from EUROCONTROL's so-called Model 3 (M3) data (Wandelt and Sun, 2015) are used, which contain partial track information from departure to destination also outside Europe. The M3 data are flight plan data partly corrected by surveillance (radar) data and are available from the DDR2 data repository of EUROCONTROL.…”

Section: Air Traffic and Aircraft Emissions Inputmentioning

confidence: 99%

Air traffic and contrail changes during COVID-19 over Europe: A model study

Schumann

Poll

Teoh

et al. 2021

Preprint

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Abstract. The strong reduction of air traffic during the COVID-19 pandemic provides a test case for the relation between air traffic density, contrails, and their radiative forcing of climate change. Air traffic and contrail cirrus changes are quantified for a European domain for March to August 2020 and compared to the same period in 2019. Traffic data show a 72 % reduction in flight distance compared with 2019. This paper investigates the induced contrail changes in a model study. The contrail model results depend on various methodological details tested in parameter studies. In the reference case, the reduced traffic caused an even stronger reduction in contrail length, partly because the weather conditions in 2020 were less favourable for contrail formation than in 2019. Contrail coverage over Europe with an optical depth larger than 0.1 decreased from 4.6 % in 2019 to 1.4 % in 2020; total cirrus cover amount changed from 28 to 25 %. The reduced contrail coverage caused 70 % less longwave and 73 % less shortwave radiative forcing with the consequential reduction of 54 % in the net forcing. The methods include recently developed models for performance parameters and soot emissions. The overall propulsion efficiency of the aircraft is about 20 % smaller than estimated in earlier studies, resulting in 3 % fewer contrails. Considerable sensitivity to soot emissions is found highlighting fuel and engine importance. The contrail model includes a new approximate method to account for water vapor exchange between contrails and background air and for radiative forcing changes due to contrail-contrail overlap. The water vapor exchange reduces available ice supersaturation in the atmosphere, which is critical for contrail formation. Contrail-contrail overlap changes the computed radiative forcing considerably. Comparisons to satellite observations are to be described in a follow-on paper.

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“…This section provides relevant results obtained from simulations of two ecosystems. The traffic scenario used for this purpose was DDR2, 1 s06.m1 model that comprises 4D flight plans ( 23 ) . The analysed traffic was dated on 24/08/2017 within the ECAC (European Civil Aviation Conference) airspace, with the total number of 36,095 flights during the day.…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Adaptive aerial ecosystem framework to support tactical conflict resolution

Radanović¹,

Piera²,

Koça³

2018

Aeronaut. j.

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To support a seamless transition between safety net layers in air traffic management, this article examines an extra capacity in the generation of the resolution trajectories, conditioned by future high dense, complex surrounding air traffic scenarios. The aerial ecosystem framework consists of a set of aircraft services inside a digitalised airspace volume, in which amended trajectories could induce a set of safety events such as an induced collision. Those aircraft services strive to the formation of a cost-efficient airborne separation management by exploring the preferred resolutions and actively interacting with each other. This study focuses on the dynamic analysis of a decreasing rate in the number of available resolutions, as well as the ecosystem deadlock event from the identified spatiotemporal interdependencies among the ecosystem aircraft at the separation management level. A deadlock event is characterised by a time instant at which an induced collision could emerge as an effect of an ecosystem aircraft trajectory amendment. Through simulations of two generated ecosystems, extracted from a real traffic scenario, the paper illustrates the relevant properties inside the structure of the ecosystem interdependencies, demonstrates and discusses an available time capacity for the resolution process of the aerial ecosystem.

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Efficient Compression of 4D-Trajectory Data in Air Traffic Management

Cited by 14 publications

References 45 publications

Air traffic and contrail changes over Europe during COVID-19: a model study

Air traffic and contrail changes over Europe during COVID-19: a model study

Air traffic and contrail changes during COVID-19 over Europe: A model study

Adaptive aerial ecosystem framework to support tactical conflict resolution

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