Contrail formation assessment based on aerological data

Lán, Sébastien; Spak, Miroslav

doi:10.1016/j.trpro.2020.11.025

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…In order to clarify some of the uncertainties about contrails and induced cloud cover, research on contrails is being conducted at the Czech Technical University in Prague (CTU) using a camera system based on collecting video of contrails and matching selected available Automatic Dependent Surveillance-Broadcast (ADS-B) data from the transponder Mode S messages of the aircraft that produced the contrails. These data can be correlated with atmospheric condition data from aerological measurements or with data from aircraft transponder Comm-B Data Selector (BDS) registers, if available [15]. Experience has shown that so far, very few aircraft (units of one percent) support the transmission of meteorological registers; moreover, aircraft are not commonly equipped with humidity sensors.…”

Section: Methodsmentioning

confidence: 99%

“…Next, data are collected from secondary radar receivers of Mode S messages, which, after decoding, contain the ICAO aircraft address, date and time, heading, latitude, longitude, altitude, GS, TAS, and Mach number. In the last step, the recorded contrails are matched with the decoded information from the aircraft that flew through the monitored airspace and caused the contrail [15].…”

Section: Contrail Observation and Pairingmentioning

confidence: 99%

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Contrails and Their Dependence on Meteorological Situations

Kameníková,

Nagy,

Hospodka

2024

Applied Sciences

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Contrails created by aircraft are a very hot topic today because they contribute to the warming of the atmosphere. Air traffic density is very high, and current forecasts predict a further significant increase. Increased air traffic volume is associated with an increased occurrence of contrails and induced cirrus clouds. The scientific level of contrails and their impact on the Earth’s climate is surprisingly low. The scientific studies published so far are mainly based on global models, in situ measurements, and satellite observations of contrails. The research is based on observations of contrails in flight paths in the vicinity of Děčín and Prague, and the collection of flight and meteorological data. It focused on the influence of the meteorological situation on the formation of persistent contrails. The collected data on contrails and meteorological variables were statistically processed using machine learning methods for classification models. Several models were developed to predict and simulate the properties of contrails as a function of given air traffic and meteorological conditions. The Random Forests model produced the best results. Dependencies between meteorological conditions, formation, and contrail lifetime were found. The aim of the study was to identify the possibility of using available meteorological data to predict persistent contrails.

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Section: Methodsmentioning

confidence: 99%

Section: Contrail Observation and Pairingmentioning

confidence: 99%

Contrails and Their Dependence on Meteorological Situations

Kameníková,

Nagy,

Hospodka

2024

Applied Sciences

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“…The message may contain different information depending on the type of message in the sense of ADS-B message or reply to Mode S EHS addressed surveillance. Of course, the aircraft must be equipped with an appropriate Mode S transponder with EHS and ADS-B 1090 MHz extended squitter, as mentioned above [31,32].…”

Section: Flight Data Processingmentioning

confidence: 99%

“…It decodes data with DF 17 to obtain the latitude, longitude, altitude, and ground speed from ADS-B, and data with DF 20 and DF 21 to obtain the heading and Mach number from BDS register 5,0 (Track and turn report) and true airspeed from BDS register 6,0 (Heading and speed report). The script uses a 24-bit ICAO (International Civil Aviation Organization) aircraft address as a unique identifier, ensuring that all relevant information received from one aircraft during the period when this aircraft was flying through the monitored part of airspace is decoded and saved into the appropriate file [32,33].…”

Section: Flight Data Processingmentioning

confidence: 99%

Contrail Lifetime in Context of Used Flight Levels

Lán

Hospodka

2022

Sustainability

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The impact of contrails on Earth’s climate is probably not negligible, yet there are only a few initiatives aimed at mitigating the influence of aviation on the environment. To achieve zero CO2 emissions, aircraft manufacturers and airlines propose complex and costly methods and technologies such as synthetic fuels, hybrid engines, or expensive carbon offsetting. On the other hand, contrail mitigation by achievable operational measures has the potential to achieve benefits with a very positive cost-benefit ratio without the need for a complex technological change in aviation. It seems that one suitable tool for contrail mitigation is the change in flight level. Therefore, we focused on the assessment of flight levels with typical contrails occurrence and common flight levels used by air traffic management. Some influence of tropopause height throughout the year was presumed to be a factor, therefore we studied different times of the year. The tropopause height influences not only contrail occurrence but also the preferred flight level, as airlines tend to avoid flying directly in the tropopause. We present some basic statistics about the frequency of contrail occurrence based on flight level. We focused on long-lived contrails to emphasize the more important contrails in this context. Information about flight levels is based on ADS-B data transmitted by aircraft and recorded by a ground station near the place of contrail occurrence, which was based on optical survey.

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