Browsing Bergen Open Research Archive by Author "Esau, Igor N."
Now showing items 1-10 of 10
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Atmospheric boundary layers in storms: advanced theory and modelling applications
Zilitinkevich, Sergej S.; Esau, Igor N.; Baklanov, A. (Peer reviewed; Journal article, 2005-03-29)Turbulent planetary boundary layers (PBLs) control the exchange processes between the atmosphere and the ocean/land. The key problems of PBL physics are to determine the PBL height, the momentum, energy and matter fluxes ... -
Formulation of the planetary boundary layer feedback in the Earth´s climate system
Esau, Igor N. (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 ... -
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
Esau, Igor N.; Zilitinkevich, Sergej S. (Conference object, 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 ... -
The Influence of large convective eddies on the surface-layer turbulence
Zilitinkevich, Sergej S.; Hunt, J.C.R; Esau, Igor N.; Grachev, A.A.; Lalas, D.P; Akylas, M.; Joffre, S.M. (Journal article; Peer reviewed, 2006-06)Close to the surface large coherent eddies consisting of plumes and downdraughts cause convergent winds blowing towards the plume axes, which in turn cause wind shears and generation of turbulence. This mechanism strongly ... -
An intercomparison of large-eddy simulations of the stable boundary layer
Beare, Robert J.; MacVean, Malcolm K.; Holtslag, Albert A. M.; Cuxart, Joan; Esau, Igor N.; Golaz, Jean-Christophe; Jimenez, Maria A.; Khairoutdinov, Marat; Kosovic, Branko; Lewellen, David; Lund, Thomas S.; Lindquist, Julie K.; McCabe, Anne; Moene, Arnold F.; Noh, Yign; Raasch, Siegfried; Sullivan, Peter (Journal article, 2005)Results are presented from the first intercomparison of Large-eddy simulation (LES) models for the stable boundary layer (SBL), as part of the GABLS (Global Energy and Water Cycle Experiment Atmospheric Boundary Layer ... -
Resistance and heat-transfer laws for stable and neutral planetary boundary layers: old theory advanced and re-evaluated
Zilitinkevich, Sergej S.; Esau, Igor N. (Journal article; Peer reviewed, 2005-07)The planetary boundary layer (PBL) resistance and heat-transfer laws express the surface fluxes of momentum and heat through the PBL governing parameters. Since the late sixties, the dimensionless coefficients (A, B and ... -
Sensitivity of simulated wintertime Arctic atmosphere to vertical resolution in the ARPEGE/IFS model
Byrkjedal, Øyvind; Esau, Igor N.; Kvamstø, Nils Gunnar (Climate Dynamics, Journal article, 2007-10-16)The current state of the art general circulation models, including several of those used by the IPCC, show considerable disagreement in simulating present day high latitude climate. This is of major concern and reduces the ... -
Surface Atmospheric Temperature as Indicator of Climate Change in the Arctic
Esau, Igor N. (Conference object, 2005-12)Surface atmospheric temperature (SAT) is one of the most reliable atmospheric characteristics used to quantify climate change. Contrary to what has been always implicitly assumed, changes in the SAT have loose relations ... -
Universal Dependences between Turbulent and Mean Flow Parameters in Stably and Neutrally Stratified Planetary Boundary Layers
Esau, Igor N.; Zilitinkevich, Sergej S. (Journal article; Peer reviewed, 2006-05-08)We consider the resistance law for the planetary boundary layer (PBL) from the point of view of the similarity theory. In other words, we select the set of the PBL governing parameters and search for an optimal way to ... -
Vertical structure of recent arctic warming from observed data and reanalysis products
Alexeev, V. A.; Esau, Igor N.; Polyakov, Igor V.; Byam, S. J.; Sorokina, Svetlana (Peer reviewed; Journal article, 2012-03)Spatiotemporal patterns of recent (1979–2008) air temperature trends are evaluated using three reanalysis datasets and radiosonde data. Our analysis demonstrates large discrepancies between the reanalysis datasets, possibly ...