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The temporal evolution of a long-lived contrail cirrus cluster: Simulations with a global climate model

Bock, Lisa and Burkhardt, Ulrike (2016) The temporal evolution of a long-lived contrail cirrus cluster: Simulations with a global climate model. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES (7), pp. 3548-3565. Wiley. DOI: 10.1002/2015JD024475 ISSN 2169-897X

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2015JD024475/abstract;jsessionid=63129EDE71F07BA26D3787943013A7E1.f04t03?systemMessage=Wiley+Online+Library+will+be+unavailable+on+Saturday+30th+July+2016+from+08%3A00-11%3A00+BST+%2F+03%3A00-06%3A00+EST+%2F+15%3

Abstract

The representation of contrail cirrus in climate models has advanced in the last years tremendously. Nevertheless, uncertainties in particular regarding the representation of contrail microphysics still remain. Properties of young contrail cirrus differ from those of natural cirrus due to the large ice crystal number concentration common in contrails. Consequently, microphysical process rates in contrail cirrus, which control its lifetime, can be very different to those in natural cirrus. We extend a contrail cirrus scheme within a climate model by implementing a microphysical two-moment scheme and study the life cycle of a contrail cirrus cluster. In an idealized experiment we study the properties and microphysical process rates of a contrail cirrus cluster in a large and long-lived ice supersaturated region. We find that at flight level contrail cirrus display their typical high ice crystal number concentration (of about 10–100 cm−3) for a few hours with far lower densities in lower levels caused by sedimentation. After about 7 h contrail cirrus have spread considerably so that even at flight level associated ice crystal number concentrations have dropped to values that prohibit fast relaxation of ice supersaturation. The reduced ice crystal number and the resulting limited water uptake in the contrail cirrus limit the lifetime of the contrail cirrus cluster to about 10 h even though surrounding conditions would be still favorable for contrail cirrus persistence. In our case studies, contrail cirrus resembles natural cirrus regarding their ice crystal number concentration and size after 5–7 h.

Item URL in elib:https://elib.dlr.de/105455/
Document Type:Article
Title:The temporal evolution of a long-lived contrail cirrus cluster: Simulations with a global climate model
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bock, LisaDLR, IPAhttps://orcid.org/0000-0001-7058-5938
Burkhardt, UlrikeDLR, IPAUNSPECIFIED
Date:2016
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
DOI :10.1002/2015JD024475
Page Range:pp. 3548-3565
Publisher:Wiley
ISSN:2169-897X
Status:Published
Keywords:contrail cirrus; contrails in climate model; microphysical development of contrails
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
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Bock, Lisa
Deposited On:01 Aug 2016 11:07
Last Modified:31 Jul 2019 20:02

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