NERSC News Archive

Transpolar currents disappear in the Arctic Ocean under a doubling of CO2

1. Professor Ola M. Johannessen is leading a research group from the Nansen Centers in Bergen and St. Petersburg and Institute of Mathematical Machines and System Problems in Kiev, Ukraine which over several years have studied how radio nuclides such as Strontium (90Sr) and Cesium (137C) have spread and will spread in the future from Sellafield, atmospheric fallout from nuclear test bombings in the past and from sources in Russian Arctic areas. We have in press a 500 page book from this work spanning over a 10 years period which will be published by "SPRINGER" in the fall 2009.


Envisat kartlegger oljesølet fra "Full City" i Skagerrak

Den Europeiske miljøovervåkningssatellitten Envisat kartlegger utbredelsen av oljesøl i Skagerrak. Fortsatt er det en del olje ute i Skagerrak som kan drive inn mot land og ytterligere forurense Sørlandskysten.

Mindre enn 1,5 time etter at Envisat satellitten passerte over Skagerrak i formiddag hadde Nansen senter for miljø og fjernmåling i Bergen bearbeidet og analysert satellitt radarbildet fra Skagerrak. Bildet viser flere oljesøl langs Sørlandskysten, nær havaristedet og ute i åpen sjø i Skagerrak etter forliste av ”Full City” ved Langesund.

Annual Reports for 2008 from the Nansen Group

Our strategy of creating “small Nansen Centers” in several countries in a north-south direction seems so far to be a fruitful adventure. Many important papers dealing with ocean processes and climate issues have been published in international referee journals – including Science and Nature – and can be taken as a prove for this.

20th. Nansen Fellowship Ph.D. Candidate defended in St. Petersburg

Dr. Natalia Zakhvatkina has completed her studies on developing automatic routines for sea ice classification and monitoring using satellite radar sensors (SAR) in the Arctic Ocean. Her research has been completed under joint supervision from Arctic and Antarctic Research Institute (AARI) - Prof. Ivan E. Frolov and the Nansen Centers in St. Petersburg Dr. Vitaliy Yu. Alexandrov and Bergen - Prof. Ola M. Johannessen. She is the 20th Russian Nansen Fellowship Ph.D. candidate completing receiving a Doctoral degree in St.

Study on the impact of hurricane on phytoplankton community

Dr. Annette Samuelsen participated in a model study on the impact of a hurricane on the phytoplankton community, recently published in Geophysical Research Letter.

This was the first study to analyze phytoplankton and zooplankton community size structure during hurricane passage. A three‐dimensional biophysical model was used to assess ecosystem dynamics, plankton biomass, and plankton distribution in the Gulf of Mexico during Hurricane Katrina (2005).

The Nansen Center hosts summer school on ocean remote sensing

The 2nd Advanced Training on Ocean Remote Sensing is being organized by ESA in Bergen - Norway, from 28 September to 02 October 2009. The training course is hosted by the Nansen Environmental and Remote Sensing Center and takes place at the VilVite Science Centre in Bergen.

As an advanced training course, it is targeted to the European, ESA Member state and Canadian research and development community, in particular post-doc researchers as well as masters and PhD students.

The training course will focus on ocean remote sensing theory and applications.

Vacant Post-Doc position in Arctic Climatology

A Post-Doc position is open for a scientist in the research project Planetary Boundary Layer Feedback in the Earth’s Climate System (PBL-feedback) at the G.C. Rieber Climate Institute at the Nansen Environmental and Remote Sensing Center, Bergen, Norway.

Ocean Science publication on modeling of the Agulhas Current

The TOPAZ/HYCOM model system of the Nansen Center is implemented and in operations for the Indian and Southern Oceans. This model system has been applied for evaluating two numerical advection schemes for eddy-resolving modeling of the Agulhas Current. Bjorn Backberg, Laurent Bertino and Johnny A.

Unique survey of ocean climate may improve climate predictions

A new letter in Nature Geoscience provides a unique assessment of ocean circulation and climate variability, and thus adds to the basis for improved climate prediction.

A research team from the Nansen Environmental and Remote Sensing Center, and the Bjerknes Centre for Climate Research, both in Bergen, Norway, has studied observed anomalies in ocean climate, and identified the anomalies’ progression with the circulation of the Nordic Seas, and the Norwegian Sea in particular.

TOPAZ surface current forecasts used at ECMWF for wave forecasting.

The ECMWF has requested access to TOPAZ forecast of surface currents as input to their operational wave model. TOPAZ has been selected both for the quality of the results and for its large coverage from the Equator to the ice edge.
Think of TOPAZ when you go surfing this week-end!

Publication on sources and spreading of radionuclides in the North Atlantic and Arctic region

Yongqi Gao, Helge Drange, Ola M. Johannessen and Lasse H.

New Research Director appointed at The G.C. Rieber Climate Institute

Dr. Igor Esau is appointed the research director of the G.C. Rieber Climate Research Institute at the Nansen Centre.

Dr. Esau got his Diploma in meteorology with honors degree at Tomsk State University, Russia in 1992. He holds two Ph.D. degrees, respectively in mathematics and physics - with applications to climatology - from Institute for Numerical Mathematics, Russian Academy of Science, Moscow, Russia in 1996 and in meteorology - planetary boundary layer - from Department of Geosciences, University of Uppsala, Uppsala, Sweden obtained in 2003.

Ocean color algorithm published by the Nansen Centers in St. Petersburg and Bergen.

Anton Korosov, Dmitry Pozdnyakov and Lasse H. Pettersson and co -authors have published the paper "Semi-empirical Algorithm for the Retrieval of Ecology-Relevant Water Constituents in Various Aquatic Environments" in Algorithms - an Open-Access Journal of Computer Science, Theory, Methods and Interdisciplinary Applications, Data and Information Systems, Software Engineering, Artificial Intelligence, Automation and Control Systems.

The paper addresses an advanced operational semi-empirical algorithm for processing satellite remote sensing data in the visible region is described.

Ensemble Optimal Interpolation: multivariate properties in the Gulf of Mexico

In a paper published in Tellus A Drs. Francois Counillon and Laurent Bertino present an ocean model system for the Gulf of Mexico and the ensemble optimal interpolation (EnOI) methods developed under Counillon Ph.D. studies at the Nansen Center.

The EnOI extracts its covariance matrix from a historical ensemble and allows for a multivariate update at a small computational cost. The Sea Level Anomaly (SLA) is used for assimilation, as it provides an integral representation of the circulation in the area.

High resolution ensemble forecasting for the Gulf of Mexico eddies and fronts

Stochastic forecasting is widely used in meteorology, in order to provide confidence indices of the prediction (Molteni et al., 1996). Stochastic forecasting is introduced by Yin and Oey (2007) for application to the GOM.

In a paper published in Ocean Dynamics Drs. Francois Counillon and Laurent Bertino present a sensitivity study to different perturbation systems is carried out by perturbing the initial state, lateral forcing, and atmospheric forcing.

Ola M. knighted : Portrait on national TV2

See TV portrait: Windows media Mac media

His Majesty the King of Norway has appointed Professor Ola Mathias Johannessen to Officer of The Royal Norwegian Order of St. Olav for his efforts in climate and polar research. On behalf of the King the assistant County Governor of Hordaland, Rune Fjeld delivered the decoration of the Order to Ola M.

GRL cover publication: Improving ocean surface velocity measurements from space

The Nansen Centers in Bergen and St. Petersburg in cooperation with IFREMER and BOOST Technologies in France obtained the cover publication in Geophysical Research Letter.

Advanced synthetic aperture radar (ASAR) signals collected by ESA´s Envisat help scientists map surface currents in the world oceans. As demonstrated, ASAR is a valuable source of high-resolution information on the line-of-sight roughness and velocity of the moving ocean surface.

Season Greetings from the Nansen Center

We thanks all our partners for the cooperation in 2008 and wish you a Merry Christmas and all the best for 2009.

Book contribution: High North - high stakes

The Arctic, once politically and literally frozen, is melting at a pace unforeseen even a few years ago. Arctic petroleum resources are of great interest in an ever-tightening global energy market, and there is a considerable potential for increased shipping in and through the region.

Meeting 9. December: "Our Northern Region - Status and Challenges"

The Norwegian Academy of Science and Letters (DNVA), The Norwegian Scientific Academy for Polar Research (NVP) and The Norwegian Academy of Technological Science (NTVA) invites to a public seminar in Bergen

Tuesday 9 December 2008 at 19:00
Nansensenteret at Marineholmen, Thormøhlensgate 47

Our Northern Region – Status and Challenges

Lectures by:
Elisabeth Walaas, State Secretary, Ministry of Foreign Affairs
Prof. Yngve Kristoffersen, University of Bergen
Prof. Ola. M. Johannessen, Nansen Center, Bergen

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