A Case Study of the Development of Contrail Clusters over the Great Lakes

Duda, David P.; Minnis, Patrick; Nguyen, Louis; Palikonda, Rabindra

doi:10.1175/1520-0469(2004)061<1132:acsotd>2.0.co;2

Cited by 51 publications

(75 citation statements)

References 34 publications

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“…Our result show larger widths not only because the pixel size is larger (SEVIRI vs. MODIS), but also because more contrail cirrus clouds are considered. Assuming an initial width of 60 m and a spreading rate of 50 m min −1 , our average width is reached slightly after 2.5 h. The spreading rate observed by Duda et al (2004) in the case study over the Great Lakes, 2.7 km h −1 , applied to our case would mean that the 7.8 km average width is reached after 2.8 h. Please note that the findings described in this paper apply to this subset of contrails.…”

Section: Length and Widthmentioning

confidence: 74%

“…The vertical resolution provided by COCS is insufficient to resolve fall speeds. The top altitude retrieval of the COCS algorithm presents a standard deviation of 750 m whereas the observations of contrail fall rates lie in the 0.045 m s −1 range (Duda et al, 2004).…”

Section: Optical Thickness and Cloud Heightmentioning

confidence: 95%

“…Combinations of satellite information and ground-based lidar measurements, such as in the Atlas et al (2006) case study, show a lifetime of more than 2 h and a mean optical thickness of 0.35. Duda et al (2004) studied the development of contrail clusters over the Great Lakes and derived τ from 0.1 to 0.6 for contrails that lasted several hours. Graf et al (2012) studied the cirrus cover cycle and observed timescales between 2.3 to 4.1 h for contrail cirrus and 1.4 to 2.4 h for linear contrails.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Contrail life cycle and properties from 1 year of MSG/SEVIRI rapid-scan images

2015

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Section: Length and Widthmentioning

confidence: 74%

Section: Optical Thickness and Cloud Heightmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Contrail life cycle and properties from 1 year of MSG/SEVIRI rapid-scan images

2015

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“…Also the later values are consistent with observations (Pisso et al, 2009). The thickness and width values, D and B, are of the right order of magnitude compared to ground-based lidar and satellite observations (Detwiler and Pratt, 1984;Freudenthaler et al, 1995;Duda et al, 2004;Atlas et al, 2006;Immler et al, 2008;Iwabuchi et al, 2012). More detailed comparisons have still to be made.…”

Section: The Turbulence Modelmentioning

confidence: 88%

“…Weather and flight track data have been used to identify contrail forming flight tracks and follow their advection (Duda et al, 2004;Atlas et al, 2006;Duda et al, 2009). From comparisons with satellite data at computed contrail-positions, optical and sedimentation properties were successfully deduced (Duda et al, 2004). Contrail persistence analysis was compared with satellite-derived contrail cover showing high sensitivity to ice supersaturation and vertical wind input (Duda et al, 2009).…”

Section: U Schumann: Contrail Cirrus Modelmentioning

confidence: 99%

A contrail cirrus prediction model

2012

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Abstract.A new model to simulate and predict the properties of a large ensemble of contrails as a function of given air traffic and meteorology is described. The model is designed for approximate prediction of contrail cirrus cover and analysis of contrail climate impact, e.g. within aviation system optimization processes. The model simulates the full contrail life-cycle. Contrail segments form between waypoints of individual aircraft tracks in sufficiently cold and humid air masses. The initial contrail properties depend on the aircraft. The advection and evolution of the contrails is followed with a Lagrangian Gaussian plume model. Mixing and bulk cloud processes are treated quasi analytically or with an effective numerical scheme. Contrails disappear when the bulk ice content is sublimating or precipitating. The model has been implemented in a "Contrail Cirrus Prediction Tool" (CoCiP). This paper describes the model assumptions, the equations for individual contrails, and the analysis-method for contrailcirrus cover derived from the optical depth of the ensemble of contrails and background cirrus. The model has been applied for a case study and compared to the results of other models and in-situ contrail measurements. The simple model reproduces a considerable part of observed contrail properties. Mid-aged contrails provide the largest contributions to the product of optical depth and contrail width, important for climate impact.

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A Lagrangian analysis of ice‐supersaturated air over the North Atlantic

2014

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[1] Understanding the nature of air parcels that exhibit ice supersaturation is important because they are the regions of potential formation of both cirrus and aircraft contrails, which affect the radiation balance. Ice-supersaturated air parcels in the upper troposphere and lower stratosphere over the North Atlantic are investigated using Lagrangian trajectories. The trajectory calculations use European Centre for Medium-Range Weather Forecasts Interim reanalysis data for three winter and three summer seasons, resulting in approximately 200,000 trajectories with ice supersaturation for each season. For both summer and winter, the median duration of ice supersaturation along a trajectory is less than 6 h. Five percent of air which becomes ice supersaturated in the troposphere and 23% of air which becomes ice supersaturated in the stratosphere will remain ice supersaturated for at least 24 h. Weighting the ice-supersaturation duration with the observed frequency indicates the likely overall importance of the longer duration ice-supersaturated trajectories. Ice-supersaturated air parcels typically experience a decrease in moisture content while ice supersaturated, suggesting that cirrus clouds eventually form in the majority of such air. A comparison is made between short-lived (less than 24 h) and long-lived (greater than 24 h) ice-supersaturated air flows. For both air flows, ice supersaturation occurs around the northernmost part of the trajectory. Short-lived ice-supersaturated air flows show no significant differences in speed or direction of movement to subsaturated air parcels. However, long-lived ice-supersaturated air occurs in slower-moving air flows, which implies that they are not associated with the fastest moving air through a jet stream.Citation: Irvine, E. A., B. J. Hoskins, and K. P. Shine (2014), A Lagrangian analysis of ice-supersaturated air over the North Atlantic,

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A Case Study of the Development of Contrail Clusters over the Great Lakes

Cited by 51 publications

References 34 publications

Contrail life cycle and properties from 1 year of MSG/SEVIRI rapid-scan images

Contrail life cycle and properties from 1 year of MSG/SEVIRI rapid-scan images

A contrail cirrus prediction model

A Lagrangian analysis of ice‐supersaturated air over the North Atlantic

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