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Global distribution of ship tracks from one year of AATSRdata

Schreier, M. and Bovensmann, H. and Mannstein, H. and Eyring, V. (2007) Global distribution of ship tracks from one year of AATSRdata. In: Proceedings of an International Conference on Transport, Atmosphere and Climate (TAC), pp. 173-177. Office for Official Publications of the European Communities, Luxembourg. TAC Conference, 2006-06-26 - 2006-06-29, Oxford, (UK). ISBN 92-79-04583-0.

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Official URL: http://www.pa.op.dlr.de/tac/proceedings.html

Abstract

The perturbation of a cloud layer by ship-generated aerosol changes the cloud reflectivity and is identified by elongated structures in satellite images, known as ship tracks. As ship tracks indicate a pollution of the clean marine environment and also affect the radiation budget below and above the cloud, it is important to investigate their radiative and climate impact. In this study we use satellite data to examine the effects of ship tracks on a particular scene as well as on the global scale. The cloud optical and microphysical properties are derived using a semi-analytical retrieval technique combined with a look-up-table approach. Within the ship tracks a significant change in the droplet number concentration, the effective radius and the optical thickness are found compared to the unaffected cloud. The resulting cloud properties are used to calculate the radiation budget below and above the cloud. Local impacts are shown for a selected scene from MODIS on Terra. The mean reflectance at top of atmosphere (TOA) is increased by 40.8 Wm-2. For a particular scene chosen close to the West Coast of North America on 10th February 2003, ship emissions increase the backscattered solar radiation at TOA by 2.0Wm-2, corresponding to a negative radiative forcing (RF). A global distribution of ship tracks derived from one year of AATSR data shows high spatial and temporal variability with highest occurrence of ship tracks westward of North America and the southwest coast of Africa, but small RF on the global scale.

Document Type:Conference or Workshop Item (Paper)
Title:Global distribution of ship tracks from one year of AATSRdata
Authors:
AuthorsInstitution or Email of Authors
Schreier, M.UNSPECIFIED
Bovensmann, H.UNSPECIFIED
Mannstein, H.UNSPECIFIED
Eyring, V.UNSPECIFIED
Date:2007
Journal or Publication Title:Proceedings of an International Conference on Transport, Atmosphere and Climate (TAC)
Page Range:pp. 173-177
Editors:
EditorsEmail
Sausen, RobertUNSPECIFIED
Blum, AnjaUNSPECIFIED
Lee, David S.UNSPECIFIED
Brüning, ClausUNSPECIFIED
Publisher:Office for Official Publications of the European Communities, Luxembourg
Series Name:EUR 22428
ISBN:92-79-04583-0
Status:Published
Keywords:ship tracks, radiative forcing
Event Title:TAC Conference
Event Location:Oxford, (UK)
Event Type:international Conference
Event Dates:2006-06-26 - 2006-06-29
Organizer:DLR, Manchester Metropolitan University
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Jana Freund
Deposited On:25 Jun 2008
Last Modified:12 Dec 2013 20:31

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