Reference : Age and the time lag method
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/2816
Age and the time lag method
English
Delhez, Eric mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Mathématiques générales >]
Deleersnijder, Eric [> > > >]
2008
Continental Shelf Research
Pergamon Press - An Imprint of Elsevier Science
28
8
1057-1067
Yes (verified by ORBi)
International
0278-4343
Oxford
United Kingdom
[en] age of seawater ; time lag ; tracer ; age
[en] The time lag method is one of the most straightforward methods used to estimate transit times from experimental data and is therefore widely used. The transit time between two points is estimated from the analysis of time series taken at these two points that suggest the propagation of a signal from one point to the other. To account for the distortion of the signal during its propagation between the two points an optimum time lag can be estimated by the analysis of the cross-correlation of the two time series. This study clarifies the relation between the transit time estimated by the time lag method and the well-defined concept of the age of a water mass. It is shown, through simplified process models, that the time lag method systematically underestimates the true mean age. The error can be quantified by means of a dimensionless parameter which is the inverse of a Peclet number based on a characteristic length given by the ratio of the velocity of the flow to the frequency of the signal. (c) 2008 Elsevier Ltd. All rights reserved.
Centre Interfacultaire de Recherches en Océanologie - MARE
http://hdl.handle.net/2268/2816
10.1016/j.csr.2008.02.003

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
Age and the time lag method.pdfPublisher postprint285.79 kBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.