Article (Scientific journals)
Along or across front survey strategy? An operational example at an unstable front
Rixen, Michel; Allen, J. T.; Alderson, S. et al.
2003In Geophysical Research Letters, 30 (1)
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Keywords :
Ocean prediction; Eddies and mesoscale processes; Fronts and jets; Modeling
Abstract :
[en] [1] We present results of the optimization of near-real time on-board sampling strategy in the Iceland-Faroes oceanic frontal area, based on the outputs of a mesoscale 3D operational data assimilation forecasting experiment. By minimizing a root mean square error cost function, we show that in this example an along-front sampling strategy, i.e. with transects parallel to the front, produces smaller errors in temperature, salinity, nitrate, phytoplankton, and zooplankton fields, as a result of a combination of the direction of the sampling of the front and errors associated with the asynopticy of observations (Doppler effect). This is contrary to the classic across-front sampling strategies that are used in most field experiments reported in the literature, i.e. where transects are perpendicular to the front. A control model shows that at these spatio-temporal scales, the along front sampling strategy is optimal when the frontal instability has sufficiently developed.
Research center :
Centre Interfacultaire de Recherches en Océanologie - MARE - GHER
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Rixen, Michel
Allen, J. T.
Alderson, S.
Cornell, V.
Crisp, N.
Fielding, S.
Mustard, A. T.
Pollard, R. T.
Popova, E. E.
Smeed, D. A.
Srokosz, M. A.
Barth, Alexander  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique
Beckers, Jean-Marie  ;  Université de Liège - ULiège > Département d'astrophys.
More authors (3 more) Less
Language :
English
Title :
Along or across front survey strategy? An operational example at an unstable front
Publication date :
10 January 2003
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Amer Geophysical Union, Washington, United States - Washington
Volume :
30
Issue :
1
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 October 2010

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