Nansen Environmental and Remote Sensing Center (NERSC)
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Arctic Sea level Budget Assessment During the GRACE/Argo Time Period
(Journal article; Peer reviewed, 2020)Sea level change is an important indicator of climate change. Our study focuses on the sea level budget assessment of the Arctic Ocean using: (1) the newly reprocessed satellite altimeter data with major changes in the ... -
Spatial heterogeneity of greening and browning between and within bioclimatic zones in northern West Siberia
(Journal article; Peer reviewed, 2016-10-26)Studies of the normalized difference vegetation index (NDVI) have found broad changes in vegetation productivity in high northern latitudes in the past decades, including increases in NDVI (‘greening’) in tundra regions ... -
On the Velocity Gradient in Stably Stratified Sheared Flows. Part 2: Observations and Models
(Peer reviewed; Journal article, 2010-05-12)Observations of the dependence of the dimensionless wind speed gradient φm as a function of the Monin–Obukhov stability parameter z/Lo under strong stability diverge from results of large-eddy simulation (LES) modelling. ... -
Heat and Mass Transfer Laws for Turbulent Convective Flows in the Atmosphere over Leads in Ice Covered Oceans, C32A-1123, American Geophysical Union (AGU) Fall Meeting, 5-9 December, San-Francisco, USA
(Conference poster, 2005)Patches of open water (cracks, leads and polynias, Figure 1) in theice cover give major contributions to turbulent exchanges of heat, moisture, CO2 and other gases between the atmosphere and Polar oceans. Here, convective ... -
Greenland Ice Sheet Elevation Ehange in Winter and Influence of Atmospheric Teleconnections in the Northern Hemisphere
(Journal article, 2009-11-16) -
Heat in the Barents Sea: Transport, storage, and surface fluxes
(Journal article, 2010-01-11)A column model is set up for the Barents Sea to explore sensitivity of surface fluxes and heat storage from varying ocean heat transport. Mean monthly ocean transport and atmospheric forcing are synthesised and force the ... -
Hurricane-driven alteration in plankton community size structure in the Gulf of Mexico: A modeling study
(Journal article, 2009-04-03)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 ... -
Remote sensing of sea ice
(OceanObs’09 Community White Paper, Conference lecture, 2009-09) -
Application of a hybrid EnKF-OI to ocean forecasting
(Journal article, 2009-10-01)Data assimilation methods often use an ensemble to represent the background error covariance. Two approaches are commonly used; a simple one with a static ensemble, or a more advanced one with a dynamic ensemble. The latter ... -
Ocean data assimilation systems for GODAE
(Oceanography, GODAE Special issue feature, Journal article, 2009-09)Ocean data assimilation has matured to the point that observations are now routinely combined with model forecasts to produce a variety of ocean products. Approaches to ocean data assimilation vary widely both in terms of ... -
Validation and intercomparison studies within GODAE
(Journal article, 2009-09)During the Global Ocean Data Assimilation Experiment (GODAE), seven international operational centers participated in a dedicated modeling system intercomparison exercise from February to April 2008. The objectives were: ... -
Influence of horizontal model grid resolution on the simulated primary production in an embedded primary production model in the Norwegian Sea
(Journal article, 2009)The purpose of this paper is to investigate the influence of horizontal grid resolution in a physical model on an embedded primary production model. The area for the experiment was along the west coast of Norway, from 60◦N ... -
Subpolar Gyre Index and the North Atlantic Meridional Overturning Circulation in a Coupled Climate Model
(Journal article, 2008-11-16)The subpolar gyre index (SPG), derived from the analysis of sea surface height (SSH), is proposed to be a potential indicator for the North Atlantic Meridional Overturning Circulation (AMOC) based on observation as well ... -
On the effect of a sill on dense water formation in a marginal sea
(Journal article, 2008-05)The properties of water mass transformation in a semi-enclosed basin, separated from the open ocean by a sill and subject to surface cooling, are analyzed both theoretically and numerically using an ocean general circulation ... -
Vulkanar i drivhuset
(Journal article, 2008) -
Semi-empirical Algorithm for the Retrieval of Ecology-Relevant Water Constituents in Various Aquatic Environments
(Journal article, 2009-03-10)An advanced operational semi-empirical algorithm for processing satellite remote sensing data in the visible region is described. Based on the Levenberg-Marquardt multivariate optimization procedure, the algorithm is ... -
Formulation of the planetary boundary layer feedback in the Earth´s climate system
(Journal article, 2008)Recent publications have revealed that the state-of-the-art climate models are probably not sensitive enough to observed changes in the surface air temperature. This fact calls for the search of feedback mechanisms making ... -
Sequential data assimilation with a nonlinear quasi-geostrophic model using Monte Carlo methods to forecast error statistics
(Journal article, 1994-05-15)A new sequential data assimilation method is discussed. It is based on forecasting the error statistics using Monte Carlo methods, a better alternative than solving the traditional and computationally extremely demanding ... -
Open Boundary Conditions for the Extended Kalman Filter With a Quasi-Geostrophic Ocean Model
(Journal article, 1993-05-18)The formulation of consistent boundary conditions for the quasi-geostrophic (QG) model with an extended Kaiman filter in a data assimilation scheme is discussed. To form a well-posed boundary value problem for the QG model, ... -
Parameter Estimation Solving a Weak Constraint Variational Formulation for an Ekman Model
(Journal article, 1997-06-15)A weak constraint variational formulation is used for inverse calculations and parameter estimation in a one-dimensional Ekman model. When parameters in the model are allowed to contain errors, the inverse problem becomes ...
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