Zobrazeno 1 - 10
of 106
pro vyhledávání: '"Klaus Gierens"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-9 (2024)
Abstract Ice saturation (and supersaturation) is a frequent phenomenon in cold regions of the upper troposphere. Its existence is essential for the formation of ice clouds and a necessary condition for the persistence of contrails. Its spatial and te
Externí odkaz:
https://doaj.org/article/64335d6df6e3467faeb4f0f6ba2b2014
Autor:
Robert Sausen, Sina Hofer, Klaus Gierens, Luca Bugliaro, Rüdiger Ehrmanntraut, Ilona Sitova, Kacper Walczak, Anja Burridge-Diesing, Milena Bowman, Nick Miller
Publikováno v:
Meteorologische Zeitschrift, Vol 33, Iss 1, Pp 83-98 (2024)
This paper describes the first-ever operational contrail avoidance trial in the real world, which took place in the region of Maastricht Upper Area Control (including the northwest of Germany, the Benelux countries and part of the North Sea) in the y
Externí odkaz:
https://doaj.org/article/4f97e6c23af24915a04ae1ace2741973
Publikováno v:
Meteorologische Zeitschrift, Vol 33, Iss 1, Pp 43-49 (2024)
In order to counteract global warming, the European Green Deal was made to improve the journey to a sustainable future. This also has an impact on aviation, because in the future the growth in air traffic must no longer lead to rising emissions, but
Externí odkaz:
https://doaj.org/article/76bceb3339c9487aa9da1e580aef3e9b
Autor:
Klaus Gierens
Publikováno v:
Meteorologische Zeitschrift, Vol 33, Iss 1, Pp 51-54 (2024)
We present a formulation for calculations of photon transmission for random cloud stacks (maximum-random overlap) that can be applied in contrail avoidance experiments, for instance. Other applications are not excluded. In contrail avoidance experime
Externí odkaz:
https://doaj.org/article/773ee607965f4d4eb6a28fa9258426d2
Autor:
Klaus Gierens, Kostas Eleftheratos
Publikováno v:
Meteorologische Zeitschrift, Vol 30, Iss 1, Pp 79-88 (2021)
Several interesting problems in remote sensing can be traced back to the question of the origin along the line of sight of the registered photons. In this paper we revive old concepts that directly follow from the equation of radiative transfer, name
Externí odkaz:
https://doaj.org/article/409729b7de6d4ffc9fdd8b398d7b14e0
Publikováno v:
Meteorologische Zeitschrift, Vol 29, Iss 2, Pp 165-176 (2020)
We study ice-supersaturation in the cold (
Externí odkaz:
https://doaj.org/article/b5bb8440c13644faac2194a32381611f
Publikováno v:
Applied Sciences, Vol 12, Iss 9, p 4450 (2022)
Climate-impacting contrails need ice (super-)saturation to persist longer than a few minutes. However, this simple criterion cannot be easily applied for the prediction of persistent contrails. The current weather forecast models, which lack humidity
Externí odkaz:
https://doaj.org/article/fcebf104fe764b9499fca3d82bb50d96
Publikováno v:
Meteorologische Zeitschrift, Vol 27, Iss 3, Pp 183-193 (2018)
The study of the lifetimes of contrails from a satellite perspective benefits from the extended coverage and close temporal monitoring. However, the initial stages of the contrail development are not observed from a satellite platform due to the sub-
Externí odkaz:
https://doaj.org/article/73c391153fa14d99aa755178d05755a8
Publikováno v:
Meteorologische Zeitschrift, Vol 26, Iss 6, Pp 621-642 (2017)
The evolution of contrail-cirrus and natural cirrus formed by homogeneous nucleation is studied over up to ten hours by means of a Large-Eddy Simulation (LES) model equipped with a Lagrangian ice microphysics module. This is the first time that both
Externí odkaz:
https://doaj.org/article/ff8fa1516456417e9a9f0a90d5c0bc0e
Autor:
Volker Grewe, Lisa Bock, Ulrike Burkhardt, Katrin Dahlmann, Klaus Gierens, Ludwig Hüttenhofer, Simon Unterstrasser, Arvind Gangoli Rao, Abhishek Bhat, Feijia Yin, Thoralf G. Reichel, Oliver Paschereit, Yeshayahou Levy
Publikováno v:
Meteorologische Zeitschrift, Vol 26, Iss 6, Pp 711-725 (2017)
Air traffic is important to our society and guarantees mobility especially for long distances. Air traffic is also contributing to climate warming via emissions of CO2 and various non-CO2 effects, such as contrail-cirrus or increase in ozone concentr
Externí odkaz:
https://doaj.org/article/a714e0bafeaf43039595b274b3abe967