File: mastdy62.htm - MAST DAYs version 6.2
OCTOPUS - Ocean Tomography Operational Package and Utilization Support
Uwe Send 1, Emmanuel Skarsoulis 2, Michael Taroudakis 2, Didier Mauuary 3, Gunnar Tietze 4, Fabienne Gaillard 5, Catherine Maillard 5
1 Institut fuer Meereskunde, Kiel, Germany; 2 FORTH/IACM, Heraklion, Greece; 3 LIS, Grenoble, France; 4 GEOMAR Technologie GmbH, Kiel, Germany; 5 IFREMER, Brest, France
Ocean Acoustic Tomography
Ocean Acoustic Tomography (OAT) has evolved to a recognized tool in oceanographic research. It is a technology ideally suited for remotely observing, studying and monitoring the large-scale state and environmental changes in the sea. OAT is an essential complement to other physical observing techniques which usually obtain data at single locations in the ocean or which can only sense the sea surface. In a sense, acoustics is THE remote sensing method for the ocean interior and it is expected to play an increasingly important role in future oceanographic research, monitoring, and forecasting applications. The long-term goals of the OCTOPUS project are
· to turn tomography into a routine, affordable, and operational tool for ocean research, monitoring and forecasting which also the non-specialist user has access to.
· to increase the acceptance and usage of tomography results as "routine" data.
· to enable small and medium enterprises (SME) to carry out operational applications and provide instrument services in tomography.
Ocean Tomography Operational Package and Utilization Support (OCTOPUS)
The OCTOPUS project will develop an OAT capability for the community of ocean scientists, service providers, and commercial enterprises, i.e.
· to develop an integrated software package
· to standardize data format and banking,
· to considerate the needs for data assimilation,
· to transfer expertise to a small / medium enterprise (SME), and
· to establish an instrument service center.
OCTOPUS Software Package
Nucleus of the OCTOPUS project is the development of a computer package, allowing oceanographers to use OAT without in-depth knowledge of all the specialties involved. The software will support
· planning of experiments,
· acoustic modeling, and
· data analysis.
The suite of software routines will allow easy and rapid preparation, processing, and analysis of tomography experiments. This will make tomography accessible and affordable for new users. The package will include
· ocean data routines to generate sound speed profiles, sections, EOF modes, etc. to be used as input for acoustic modelling
· acoustic propagation modelling routines to calculate transmission losses, arrival patterns, influence coefficients for inversions
· data pre-processing routines to perform the signal processing (cross-correlation, Doppler analysis, etc.), mooring motion compensation, clock drift correction
· data analysis routines to perform arrival time estimation, peak identification, and slice inversions.
OCTOPUS Data Management and Exploitation
A standard data format will be established for archiving of tomography data, upstream compatible with the software package, downstream compatible with user requirements. A set of companion corrections and standard levels of processing will be defined to be included in a tomography data archive. OAT results are of interest for oceanographers, acousticians, and numerical modellers interested in using data assimilation. Needs corresponding to other possible uses of the data will be analyzed and taken account of.
A data bank will be established for the European tomography data from this OCTOPUS and other MAST projects. These measures are important for dissemination and to make tomography more accepted and widely used as standard data for research and future monitoring and forecasting applications such as GOOS.
OCTOPUS Products and Instrument Service
The establishment of an instrument service center is important for operational observing systems of the ocean which are now being designed and for which tomography is a candidate. The maintenance of such systems is beyond the role and capabilities of research institutions, and thus operational agencies or European private companies must be prepared for this type of demand.
The industrial SME partner in OCTOPUS is responsible for the integration of the software package and will thus become familiar with the routine processing of tomography data. In addition, the industrial partner will establish a calibration facility for tomography instruments and will initiate an instrument service center, offering its service to academia as well as to applied sciences. Since the SME company is already performing other sea-going geoscientific and oceanographic services, it will thus be prepared to provide complete services for routine and operational applications of tomography.
OCTOPUS Contract No.: MAS3-CT97-0147
OCTOPUS Coordinator: Dr. Uwe Send
Institut für Meereskunde
Universität Kiel
Düsternbrooker Weg 20
D - 24105 Kiel, Germany
Tel: +49-431-5973827, Fax: +49-431-5973821
email: usend@ifm.uni-kiel.de
OCTOPUS Partners:
Dr. Emmanuel Skarsoulis
Foundation for Research and
Technology (FORTH) - HELLAS
Vassilika Vouton
B.O. Box 1527
711 10 Heraklion, Crete, Greece
Tel +30 81-391776
Fax +30 81-391801
e-mail: eskars@iacm.forth.gr
Dr. Gunnar Tietze
GEOMAR Technologie GmbH (GTG)
Wischhofstr. 1-3, Geb. 11
D - 24148 Kiel, Germany
Tel +49 431-7209611
Fax +49 431-7209699
e-mail: gtg@geomar-gtg.de
Dr. Didier Mauuary
Institut National Polytechnique
de Grenoble (INPG)
46 Avenue Felix Viallet
38031 Grenoble Cedex 1, France
Tel +33 476-826486
Fax +33 476-826383
e-mail: Didier.Mauuary@cephag.inpg.fr
Dr. Fabienne Gaillard
Institut Francais de Recherche pour
l'Exploitation de la Mer (IFREMER)
155, Rue Jean-Jacques Rousseau
92138 Issy-les-Moulineaux, France
Tel +33 298-224288
Fax +33 298-224496
e-mail: Fabienne.Gaillard@ifremer.fr
Files: v: 0403 / poster.98
M File: pekdem2
Measured OAT data (observation date vs. arrival time), source: Labrador Sea experiment
O File: logoocto.eps
OCTOPUS-Logo
P File: p1.tif
OCTOPUS software package: design of TOMOLAB
T File: aver.tif
Data analysis, inversion result for temperature variations: depth-averaged potential temperature compared with hydrographic and climatologic data (source: THETIS-2 experiment).