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Simulations of dehydration effects from contrails in a global climate model

Schumann, Ulrich and Penner, Joyce and Chen, Yibin and Zhou, Cheng and Graf, Kaspar (2015) Simulations of dehydration effects from contrails in a global climate model. 4th International Conference on Transport, 22-25 June 2015, Bad Kohlgrub, Deutschland.

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Official URL: http://www.pa.op.dlr.de/tac/2015/restricted/index.html


We study the effects of humidity exchange between contrails and background atmosphere using the Contrail Cirrus Prediction Model CoCiP (Schumann, GMD, 2012) coupled with the climate model CAM3+/IMPACT (Penner et al., 2009; Zhou and Penner, JGR, 2014). Contrail ice particles grow by uptake of humidity from ambient ice supersaturated air masses. By sedimentation, contrails contribute to dehydration of the upper troposphere and to humidity increases at lower levels. After advection in rising or subsiding air masses, contrail may release water at places higher or lower than where the contrail formed. The dehydration may reduce natural cloudiness and, hence, partly offset positive radiative forcing from contrail cirrus (Burkhardt and Kärcher, 2011). LES show thinner contrails when they overlap with others (Unterstraßer and Sölch, 2012). The coupled CoCiP-CAM model simulates all individual contrails forming globally using a Lagrangian contrail model. The coupling accounts for conservation of humidity during contrail formation and sublimation. In the coarse global model, local changes in humidity from contrail formation become notable only when many contrails form. The simulated contrails agree well with observations. The amount of water stored inside contrails is 1 million times larger than the amount of water emitted. Contrail ice particles sediment typically 700 m. Because of local dehydration, less contrails form, with less cover of optically thick contrails, but individual contrails have larger life time and width.

Item URL in elib:https://elib.dlr.de/97374/
Document Type:Conference or Workshop Item (Speech)
Title:Simulations of dehydration effects from contrails in a global climate model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Penner, JoyceUniv of MichiganUNSPECIFIED
Chen, YibinUniv of MichiganUNSPECIFIED
Zhou, ChengUniv of MichiganUNSPECIFIED
Date:25 June 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:contrail cirrus dehydration CoCiP climate radiative forcing
Event Title:4th International Conference on Transport
Event Location:Bad Kohlgrub, Deutschland
Event Type:international Conference
Event Dates:22-25 June 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Schumann, Prof.Dr.habil. Ulrich
Deposited On:21 Jul 2015 19:11
Last Modified:24 Nov 2016 11:02

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