Previous Seminars

On the Time-Mean State of Ocean Models and the Properties of Long-Range Acoustic Propagation

Speaker: 
Brian Dushaw
Affiliation: 
Applied Physics Laboratory, University of Washington Seattle, WA USA
Seminar Date: 
5. April 2013 - 12:30 - 13:15

Receptions on three vertical hydrophone arrays from basin-scale acoustic transmissions in the North Pacific during 1996 and 1998 are used to test the time-mean sound-speed properties of the World Ocean Atlas 2005 (WOA05), of an eddying unconstrained simulation of the Parallel Ocean Program (POP), and of three data-constrained solutions provided by the Estimating the Circulation and Climate of the Ocean (ECCO) project: a solution based on an approximate Kalman filter from the Jet Propulsion Laboratory (ECCO-JPL), a solution based on the adjoint method from the Massachusetts Institute of Technol

Lecture 3: Geostatistical Monte-Carlo: conditional Gaussian simulation

Speaker: 
Hans Wackernagel
Affiliation: 
Ecole des Mines de Paris
Seminar Date: 
4. April 2013 - 11:00 - 12:00

STYLE

Each of these lectures will start by introducing to basic concepts of geostatistics and
end with a glimpse on more advanced techniques around the topic of the day.

BIBLIOGRAPHY

CHILÈS J., DELFINER P. (2012)
Geostatistics: Modeling Spatial Uncertainty. Second edition,
Wiley.

DIGGLE P., FUENTES M., GELFAND A.E., GUTTORP P. (2010)
Handbook of Spatial Statistics.
Chapman Hall.

LANTUÉJOUL , C. (2002)
Geostatistical Simulation: Models and Algorithms.
Springer.

WACKERNAGEL, H. (2003)

Lecture 2: Geostatistical interpolation/estimation: kriging methods

Speaker: 
Hans Wackernagel
Affiliation: 
Ecole des Mines de Paris
Seminar Date: 
3. April 2013 - 11:00 - 12:00

STYLE

Each of these lectures will start by introducing to basic concepts of geostatistics and
end with a glimpse on more advanced techniques around the topic of the day.

BIBLIOGRAPHY

CHILÈS J., DELFINER P. (2012)
Geostatistics: Modeling Spatial Uncertainty. Second edition,
Wiley.

DIGGLE P., FUENTES M., GELFAND A.E., GUTTORP P. (2010)
Handbook of Spatial Statistics.
Chapman Hall.

LANTUÉJOUL , C. (2002)
Geostatistical Simulation: Models and Algorithms.
Springer.

WACKERNAGEL, H. (2003)
Multivariate Geostatistics: an Introduction with Applications.

Lecture 1 Geostatistical structural analysis: the variogram

Speaker: 
Hans Wackernagel
Affiliation: 
Ecole des Mines de Paris
Seminar Date: 
2. April 2013 - 11:00 - 12:00

STYLE

Each of these lectures will start by introducing to basic concepts of geostatistics and
end with a glimpse on more advanced techniques around the topic of the day.

BIBLIOGRAPHY

CHILÈS J., DELFINER P. (2012)
Geostatistics: Modeling Spatial Uncertainty. Second edition,
Wiley.

DIGGLE P., FUENTES M., GELFAND A.E., GUTTORP P. (2010)
Handbook of Spatial Statistics.
Chapman Hall.

LANTUÉJOUL , C. (2002)
Geostatistical Simulation: Models and Algorithms.
Springer.

WACKERNAGEL, H. (2003)
Multivariate Geostatistics: an Introduction with Applications.

ACOBAR talks

Speaker: 
several
Seminar Date: 
21. March 2013 - 9:00 - 16:00

The meeting is open to anyone interested

Session 1: The high Arctic
1. B. Rabe, Arctic Ocean circulation - an introduction.
2. P. Worcester et al. Multipurpose acoustic networks in the Integrated Arctic Ocean observing
system. (White paper for Arctic Observation Summit 2013)
3. A. Morozov, TWR/WHOI. “Status and developments in acoustic source technologies and
gliders at TWR for use in the Arctic.”
4. G. Hope, UiB, “Microseismic measurements in the high Arctic using a Hovercraft as a
platform”
5. H. Keers, K. Atakan, Mo Yan, UiB, “ The Arctic dimension of EPOS (Earth Plate

Antipodal Acoustic Thermometry: 1960, 2004

Speaker: 
Brian Dushaw
Affiliation: 
Applied Physics Laboratory, University of Washington and NERSC
Seminar Date: 
7. March 2013 - 12:30 - 13:15

On 21 March 1960, sounds from three 300-lb depth charges deployed at 5.5-min. intervals off Perth, Australia were recorded by the SOFAR station at Bermuda. The recorded travel time of these signals, about 13,375 s, is a historical measure of the ocean temperature averaged across several ocean basins. The 1960 travel time measurement has about 3-s precision. High-resolution global ocean state estimates for 2004 from the ``Estimating the Circulation and Climate of the Ocean, Phase II'' (ECCO2) project were combined with ray tracing to determine the paths followed by the acoustic signals.

Creating Land surface Air Temperature datasets for 21st Century science and societal needs

Speaker: 
Peter Thorne
Affiliation: 
Cooperative Institute for Climate and Satellites- NC, North Carolina State University and NOAA´s National Climatic Data Center
Seminar Date: 
4. March 2013 - 13:15 - 14:00

Guest Lecture
at the Nansen Center,
Thormøhlensgate 47

March 4th. 2013, at 13:15
by
Dr. Peter Thorne
Cooperative Institute for Climate and Satellites- NC,
North Carolina State
University and NOAA´s National Climatic Data Center

Title;
"Creating Land surface Air Temperature datasets for 21st Century science and societal needs"

Local Ensemble Transform Kalman Filter: a non stationary control law for complex Adaptive Optics systems on Extremely Large Telescopes

Speaker: 
Morgan Gray
Affiliation: 
Laboratoire d'Astrophysisque de Marseille, CNRS.
Seminar Date: 
26. February 2013 - 12:30 - 13:00

The project considers the application of ensemble data assimilation techniques to the advanced Adaptive Optics (AO) of the E-ELT, the future largest telescope in the world. This is justified by the increasing complexity of AO systems and the need to correct high-dimensional AO systems for atmospheric turbulence. The classical Kalman Filter will soon become intractable in AO systems, which justifies the exploration of ensemble data assimilation techniques borrowed from the fields of geophysics and first introduced at NERSC in Norway.

'Arctic ice modelling'

Speaker: 
Uma Bhatt
Affiliation: 
Uni. Fairbanks, Alaska
Seminar Date: 
22. February 2013 - 14:15 - 15:00

The transformation of the Arctic sea ice cover: observations and implications of a new regime in the north

Speaker: 
Walt Meier
Affiliation: 
National Snow and Ice data Center, University of Colorado, Boulder
Seminar Date: 
20. February 2013 - 11:15 - 12:00