Results 101 to 110 of about 15,587 (203)
Effective Radius of Ice Particles in Cirrus and Contrails
Journal of the Atmospheric Sciences, 2011 Abstract This paper discusses the ratio C between the volume mean radius and the effective radius of ice particles in cirrus and contrails. The volume mean radius is proportional to the third root of the ratio between ice water content and number of ice particles, and the effective radius measures the ratio between ice particle volume ...
Schumann, Ulrich +7 more
openaire +2 more sources
Observational evidence of contrail cirrus in slightly ice-subsaturation
, 2023 Contrail cirrus, including line-shaped contrails, has a net warming effect on theEarth’s climate. Of great importance to estimate their radiative effect is the coverageand mean optical thickness, which are closely associated with the conditions ...
Bundke, Ulrich +10 more
core
Detection of embedded contrails in airborne lidar measurements [PDF]
Atmospheric Measurement TechniquesAviation affects the Earth's energy balance through CO2 and non-CO2 emissions. Contrails mark one of the latter and can occur inside the cirrus clouds where they might affect the clouds' optical and microphysical characteristics as well as their climate ...
M. Soleimanpour +3 more
doaj +1 more source
Numerical simulations of contrail-to-cirrus transition – Part 1: An extensive parametric study [PDF]
Atmospheric Chemistry and Physics, 2010 Simulations of contrail-to-cirrus transition over up to 6 h were performed using a LES-model. The sensitivity of microphysical, optical and geometric contrail properties to relative humidity RH<sub><i>i</i></sub>, temperature < ...
S. Unterstrasser, K. Gierens
doaj
, 1999 Contrails are visible line-shaped clouds forming in the wake of aircraft. Contrails may spread, trigger extensive cirrus cloud formation, and influence the Earth's radiation budget.
Schumann, U. +1 more
core
Impact of biofuels on contrail warming
Environmental Research Letters, 2017 Contrails and contrail-cirrus may be the largest source of radiative forcing (RF) attributable to aviation. Biomass-derived alternative jet fuels are a potentially major way to mitigate the climate impacts of aviation by reducing lifecycle CO _2 ...
Fabio Caiazzo +3 more
doaj +1 more source
Are contrail cirrus climate effects predictable?
, 2015 The climate impact of aviation may be minimized by selecting routes with minimum warming from contrail cirrus and CO2. Such an approach requires sufficient scientific understanding.
Schumann, Ulrich
core
Feasibility of contrail avoidance in a commercial flight planning system: an operational analysis
Environmental Research: Infrastructure and SustainabilityAircraft condensation trails, also known as contrails, contribute a substantial portion of aviation’s overall climate footprint. Contrail impacts can be reduced through smart flight planning that avoids contrail-forming regions of the atmosphere.
A Martin Frias +5 more
doaj +1 more source
Liquid Hydrogen: A Mirage or Potent Solution for Aviation's Climate Woes? [PDF]
Environ Sci Technol, 2023 Miller TR, Chertow M, Hertwich E.
europepmc +1 more source
Transmission formulation for random stacks of clouds
Meteorologische ZeitschriftWe 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 experiments,
Klaus Gierens
doaj +1 more source