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Contrail properties over the eastern North Pacific from AVHRR data

Minnis, Patrick and Palikonda, Rabindra and Walter, Bryan J. and Ayers, J. Kirk and Mannstein, Hermann (2005) Contrail properties over the eastern North Pacific from AVHRR data. Meteorologische Zeitschrift, 14, pp. 515-523. DOI: 10.1127/0941-2948/2005/0056.

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An increase of air traffic over the North Pacific during the last 30 years has been accompanied by an increase in cirrus coverage. To help alleviate the uncertainty in the contribution of air traffic to the cirrus increase, an analysis of linear contrail coverage over the region has been initiated using afternoon NOAA-16 AVHRR data taken during 4 months in 2002 and 2003. Manual evaluation of the automated contrail detection method revealed that it misclassified, on average, 32 % of the pixels as contrails and missed 15 % of the contrail pixels. After correction for detection errors, the contrail coverage over the domain between 25<sup>o</sup> and 55<sup>o</sup>N and between 120<sup>o</sup> and 150<sup>o</sup>W varied from a minimum of 0.37 % in February to a maximum of 0.56 % in May, respectively. The annual mean coverage, after correcting for the diurnal cycle of air traffic, is 0.31 %, a value very close to earlier theoretical estimates for the region. Contrail optical depths for the 4 months average 0.24 resulting in a mean unit contrail longwave radiative forcing of 14.2 Wm <sup>-2</sup>. The contrail optical depths are twice the mean value expected from theoretical estimates.

Document Type:Article
Title:Contrail properties over the eastern North Pacific from AVHRR data
AuthorsInstitution or Email of Authors
Minnis, PatrickNASA Langley Research Center, USA
Palikonda, RabindraAS & M, Inc., Hampton, VA, USA
Walter, Bryan J.AS & M, Inc., Hampton, VA, USA
Ayers, J. KirkAS & M, Inc., Hampton, VA, USA
Mannstein, HermannUNSPECIFIED
Date:August 2005
Journal or Publication Title:Meteorologische Zeitschrift
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 515-523
Keywords:contrail, air traffic, AVHRR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Hermann Mannstein
Deposited On:16 Apr 2007
Last Modified:11 Nov 2014 21:56

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