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Jet Alignment In A Two-layer Quasigeostrophic Channel Using One-dimensional Grip Warping


Because of position errors, traditional methods of data assimilation can broaden and weaken jets or other flow structures, leading to reduced forecast skill. Here a technique to assimilate properties of coherent structures is developed and tested. Focusing on jets, the technique identifies jets in both the modeled and observed fields and warps the model grid so that the jet positions are better aligned prior to further assimi- lation of observations. The technique is tested using optimal interpolation on the flow in a two-layer quasi- geostrophic channel. The results show that a simple and fast jet position correction algorithm can significantly improve the skill of a 12-h forecast. Furthermore, the results indicate that this method of position correction maintains its utility when observations become sparse.

Article / Publication Data
Available Metadata
Accepted On
November 18, 2009
Fiscal Year
Publication Name
Journal of The Atmospheric Sciences
Published On
July 01, 2010
Publisher Name
Amer Meteorological Soc
Print Volume
Print Number
Page Range
Submitted On
July 17, 2009


Not available


Authors who have authored or contributed to this publication.

  • brad E. beechler - Not Positioned Other
    Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder
    NOAA/Global Systems Laboratory