[GTP] NCAR MMM seminar

[Jielun Sun]

  The abstract for Aime Fournier's talk can be found at 
http://www.nesl.ucar.edu/events/events.php?div=mmm&type=all.
Jielun

On 10/20/10 10:26 AM, Silvia Gentile wrote:
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> For questions please contact MMM SEMINAR COORDINATOR:  Jielun Sun,
> 303-497-8994
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> jsun at ucar.edu http://www.mmm.ucar.edu/sem/seminars.html
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> *
> Development of Wavelet Methodology for WRF Data Assimilation*
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> */Aimé Fournier/*
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> /National Center for Atmospheric Research/
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> /Mesoscale and Microscale Meteorology Division/
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> /Boulder, CO/
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> / /
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> This work aims at improved computation of covariances and of multiscale structures such as clouds, in the Weather Research and Forecasting (WRF) data-assimilation (WRFDA) system, in particular the horizontal factor of the control-variable transform.  Better representation can be achieved in the horizontal transform by wavelet-compression techniques that have been proven in many other applications.
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> In this work, two past obstacles to effective incorporation of wavelets in limited-area models such as WRF are resolved: isometric-injective (i.e., energy preserving, left-invertible) wavelets avoid boundary-condition assumptions at any scale; and these wavelets can be applied to non-dyadic data lengths.  A summary technical description of these improved wavelets and their implementation into WRFDA is presented.  By retaining only a diagonal background-covariance matrix in wavelet space, appropriate
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> heterogeneity is obtained for the model-space covariances.
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> A second wavelet application is to partition observation error into a part due to poor representation (e.g., too-coarse resolution), and a residual, using a novel criterion in wavelet space.  Other methods to construct inhomogeneous anisotropic covariance models are cited, and other potential technical improvements are discussed.
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> *_ _*
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> *Thursday**, 28 October 2010, 3:30 PM*
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> Refreshments 3:15 PM
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> NCAR-Foothills Laboratory
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> 3450 Mitchell Lane
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> Bldg 2 Auditorium, Room 1022
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-- 
Jielun Sun
Mesoscale and Microscale Meteorology
National Center for Atmospheric Research
3450 Mitchell Lane
Boulder, Colorado 80301
USA
303-497-8994
jsun at ucar.edu