A Constrained Spectral Approximation of Subgrid‐Scale Orography on Unstructured Grids

Autor: Ray Chew, Stamen Dolaptchiev, Maja‐Sophie Wedel, Ulrich Achatz

Publikováno v: Journal of Advances in Modeling Earth Systems, Vol 16, Iss 8, Pp n/a-n/a (2024)

Abstract The representation of subgrid‐scale orography is a challenge in the physical parameterization of orographic gravity‐wave sources in weather forecasting. A significant hurdle is encoding as much physical information with as simple a repre

Externí odkaz: https://doaj.org/article/604b94e47c5f4b5284433264bdac6b0a

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Benchmarking in a rotating annulus: a comparative experimental and numerical study of baroclinic wave dynamics

Autor: Miklos Vincze, Sebastian Borchert, Ulrich Achatz, Thomas von Larcher, Martin Baumann, Claudia Liersch, Sebastian Remmler, Teresa Beck, Kiril D. Alexandrov, Christoph Egbers, Jochen Fröhlich, Vincent Heuveline, Stefan Hickel, Uwe Harlander

Publikováno v: Meteorologische Zeitschrift, Vol 23, Iss 6, Pp 611-635 (2015)

The differentially heated rotating annulus is a widely studied tabletop-size laboratory model of the general mid-latitude atmospheric circulation. The two most relevant factors of cyclogenesis, namely rotation and meridional temperature gradient are

Externí odkaz: https://doaj.org/article/b7687a6fa95c48de816477e3018afe78

Four-dimensional positron age-momentum correlation

Autor: Ulrich Ackermann, Benjamin Löwe, Marcel Dickmann, Johannes Mitteneder, Peter Sperr, Werner Egger, Markus Reiner, Günther Dollinger

Publikováno v: New Journal of Physics, Vol 18, Iss 11, p 113030 (2016)

We have performed first four-dimensional age-momentum correlation (4D-AMOC) measurements at a pulsed high intensity positron micro beam and determined the absolute value of the three-dimensional momentum of the electrons annihilating with the positro

Externí odkaz: https://doaj.org/article/1b7064f0e0ff4c63a334b62949fc6e5e

A multi-step approach: Coupling of biodegradation and UV photocatalytic oxidation TiO 2 for the treatment of naphthenic acid fraction compounds in oil sands process-affected water.

Autor: Miles SM; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada., Balaberda AL; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada., Leshuk TMC; Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada., Peru K; Water Science and Technology Directorate, Environment and Climate Change Canada, Saskatoon, SK S7N 3H5, Canada., Headley J; Water Science and Technology Directorate, Environment and Climate Change Canada, Saskatoon, SK S7N 3H5, Canada., Gu F; Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada., Ulrich AC; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada. Electronic address: aulrich@ualberta.ca.

Publikováno v: Chemosphere [Chemosphere] 2024 Aug; Vol. 361, pp. 142502. Date of Electronic Publication: 2024 Jun 03.