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Diurnal cycle of linear contrails, cirrus, and outgoing longwave radiation in the North Atlantic from MODIS, MSG and models

Graf, Kaspar and Schumann, Ulrich and Minnis, Patrick and Duda, David (2014) Diurnal cycle of linear contrails, cirrus, and outgoing longwave radiation in the North Atlantic from MODIS, MSG and models. The Fourth Cloud Retrieval Evaluation Workshop (CREW 4), 4.-7. Mai 2013, Grainau, Germanny.

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Official URL: https://www.icare.univ-lille.fr/hosted-content/crew/images/5/5d/Poster_CREW-4_Schumann.pdf


Cloud cover from linear contrails, cirrus cloud cover, and outgoing longwave radiation (OLR) at top of the atmosphere were derived from MSG SEVIRI in a North Atlantic region (NAR) for a period of eight years (Febr 2004- Jan 2012) with 15 min time resolution. The aviation induced contributions to cirrus coverage and OLR in the NAR flight corridor were derived from these data assuming linear response of cirrus and OLR changes to air traffic density and cirrus/OLR background without aviation assumed either constant of as observed in the corresponding South Atlantic region (SAR). Global results were obtained by extrapolating the regional results with global models [Graf et al., 2012; Schumann and Graf, 2013]. Here, the results are compared with linear contrail coverage values derived from MODIS aboard the LEO satellites Terra and Aqua [Duda, Minnis et al., 2013] . The global observations revealed surprisingly high contrail cover in the North Atlantic region. Terra and Aqua overpass times in the NAR are limited to four narrow time intervals and hence cannot resolve the full diurnal cycle. The results are also compared with predictions of contrail cover and OLR forecast by the Contrail and Cirrus Prediction tool CoCiP. CoCiP computes the cirrus and OLR changes for given meteorology and given air traffic. The comparisons show that the LEO observations tend to overestimate the daily mean aviation effects in the NAR because the observations times coincide with times of traffic peaks in the NAR.

Item URL in elib:https://elib.dlr.de/189302/
Document Type:Conference or Workshop Item (Poster)
Additional Information:See also K. Graf: Der Beitrag des Flugverkehrs zum Tagesgang der Zirrenbedeckung und der ausgehenden langwelligen Strahlung über dem Nordatlantischen Flugkorridor. 2013 Ph.D. Thesis, University of Munich, Department of Physics. and DLR FB
Title:Diurnal cycle of linear contrails, cirrus, and outgoing longwave radiation in the North Atlantic from MODIS, MSG and models
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Minnis, PatrickNASA Langley Research Center, Hampton, VA, USAUNSPECIFIEDUNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:contrails, remote sensing, cirrus, radiation, air traffic, MODIS, CoCiP, climate, North Atlantic
Event Title:The Fourth Cloud Retrieval Evaluation Workshop (CREW 4)
Event Location:Grainau, Germanny
Event Type:Workshop
Event Dates:4.-7. Mai 2013
Organizer:International Cloud Working Group (ICWG)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research, L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Cloud Physics
Deposited By: Schumann, Prof.Dr.habil. Ulrich
Deposited On:25 Oct 2022 08:01
Last Modified:25 Oct 2022 08:01

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