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Sensitivity of the shortwave to longwave ratio in contrail radiative forcing calculations with different radiation schemes

Ponater, Michael and Dietmüller, Simone and Frömming, Christine and Bock, Lisa (2013) Sensitivity of the shortwave to longwave ratio in contrail radiative forcing calculations with different radiation schemes. EGU Tagung 2013, 8.-12. Apr. 2013, Wien, Österreich.

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Contrail radiative forcing is difficult to obtain, even if contrail parameters like coverage, ice water content, crystal size etc. are known. A substantial respective uncertainty has been documented in literature. One key problem is the considerable amount of cancellation between the positive (warming) component from the contrails' greenhouse effect and the negative (cooling) component from backscattering of solar irradiance. Furthermore, the longwave/shortwave cancellation depends on ambient parameters like temperature, co-existing natural clouds, and surface albedo. High demands are set for any radiative transfer model aiming at reliable results of the net radiative forcing. Climate models are optimally suited to provide a representation of the required variety of ambient parameters for a climatological estimate of contrail radiative forcing. However, comprehensive global climate models use simplified radiative transfer schemes for reasons of computational economy. Hence, a dedicated test of these schemes is required. We present a comparison of contrail radiative forcing estimates from two global climate models with different radiation schemes. The first estimate results from the ECHAM4 model that has been frequently used over the last ten years for contrail climate impact calculations. The second estimate originates fromthe more recent ECHAM5/MESSy Atmospheric Chemistry (EMAC) model that is used in current and future studies. Use is made of the so-called "Myhre benchmark test" with specified contrail parameters. Particular emphasis is given to longwave/shortwave ratios for different seasons and to daytime/nighttime differences.

Item URL in elib:https://elib.dlr.de/82012/
Document Type:Conference or Workshop Item (Poster)
Title:Sensitivity of the shortwave to longwave ratio in contrail radiative forcing calculations with different radiation schemes
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Contrails, Radiative Forcing, ECHAM4, ECHAM5, thin cirrus
Event Title:EGU Tagung 2013
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:8.-12. Apr. 2013
Organizer:European Geophysical Union
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
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
Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Ponater, Dr.rer.nat. Michael
Deposited On:18 Apr 2013 18:06
Last Modified:18 Apr 2013 18:06

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