Technical reports

The HIRLAM Technical reports since the beginning of the HIRLAM programme are gradually being imported into the DOCman document management system.

 

Overview

TR# Subject Author(s)
HIRLAM Technical Report No. 70 (6.03 MB)icon

HARMONIE verifcation and evaluation
                March 2017 

Wim de Rooy and Hylke de Vries et al
HIRLAM Technical Report No. 69 (3.55 MB)icon A verification score for High resolution NWP:
idealized and preoperational tests
             December 2012

Bent H. Sass and Xiaohua Yang

... Report from the SRNWP Workshop on High
resolution data assimilation with emphasis
on the use of moisture-related observations
                July 2008

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Categories

HIRLAM Technical Report No. 68, July 2008

HIRLAM Technical Report No. 68, July 2008 ( 10 Files )

Report from the SRNWP Workshop on High resolution data assimilation with emphasis on the use of moisture-related observations, held 21-23 March 2007 at the Museum of Work, Norrkøping, Sweden. Edited by Nils Gustafsson.

Documents

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HIRLAM Technical Report No. 14: Simulations of intense cyclones near Iceland: The Greenhouse Low, 3 February 1991 HIRLAM Technical Report No. 14: Simulations of intense cyclones near Iceland: The Greenhouse Low, 3 February 1991

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Date added: 10/24/2014
Date modified: 10/24/2014
Filesize: 10.9 MB
Downloads: 1749

By Jon Egill Kristjansson and Sigurdur Thorsteinsson

HIRLAM Technical Report No. 13: Experimentation with second and fourth order horizontal diffusion schemes HIRLAM Technical Report No. 13: Experimentation with second and fourth order horizontal diffusion schemes

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Date added: 10/24/2014
Date modified: 10/24/2014
Filesize: 3.81 MB
Downloads: 2416

By Kalle Eerola

October 1993

Contents

1. INTRODUCTION p.1
2. PROPERTIES OF THE HORIZONTAL DIFFUSION SCHEMES p.2
2.1 Numerical approximation of the diffusion term p.2
2.2 Response function of the fourth order scheme p.4
2.3 Properties of the fourth order scheme p.7
2.4 The response function of the non-linear second order scheme p.9
3. CASE STUDIES p.11
3.1 Record deep cyclone in February 1990 p.11
3.2 Conclusions from the case study p.16
4. DATA ASSIMILATION EXPERIMENT WITH TWO DIFFUSION SCHEMES p.19
4.1 Diagnostic parameters p.19
4.2 Diffusion of temperature p.21
5. CONCLUSIONS p.25
ACKNOWLEDGEMENTS p.26
REFERENCES p.27

HIRLAM Technical Report No. 12: Initialization Schemes for HIRLAM based on Recursive Digital Filters HIRLAM Technical Report No. 12: Initialization Schemes for HIRLAM based on Recursive Digital Filters

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Date added: 10/24/2014
Date modified: 10/24/2014
Filesize: 4.42 MB
Downloads: 1887

By Peter Lynch and Xiang-Yu Huang

October 1993

Contents:

1. Introduction
2. Theory of Recursive Digital Filters
 2.1 Definition of Digital Filters
 2.2 Design of Recursive Filters
3. Application to Initialization
 3.1 HIRLAM Model
 3.2 Nonrecursive Implementation of Recursive Filters
 3.3 Filter Parameter Values and Delay
4. Design of Experiments
5. Results with Second-order Filters
 5.1 Reduction of Noise
 5.2 Changes in initial fields and forecasts
6. Higher order filters
7. Filtered Start-up or Launch
8. Conclusions
 8.1 Review of Results
 8.2 Future Activities
Acknowledgements
Appendix A. Analog Filters; the Quick-Start Filter
Appendix B. Inductive Construction of the Filter Matrix F
References

 

HIRLAM Technical Report No. 11: A comparison between Digital Filtering Initialization and Nonlinear Normal Mode Initialization in a Data Assimilation System HIRLAM Technical Report No. 11: A comparison between Digital Filtering Initialization and Nonlinear Normal Mode Initialization in a Data Assimilation System

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Date added: 10/24/2014
Date modified: 10/24/2014
Filesize: 4.45 MB
Downloads: 1645

by Xiang-Yu Huang, Annette Cederskov and Erland Kallen

June 1993

Contents

1. Introduction
2. The data assimilation and forecast system
2.1. Objective analysis
2.2. Initialization
2.2.1. Adiabatic nonlinear normal mode initialization
2.2.2. Diabatic nonlinear normal mode initialization
2.2.3. Adiabatic digital fitering initialization
2.3. Forecast model
3. Results
3.1. Reduction ofnoise
3.2. Precipitation
3.3. Analysis and initialization errors
3.4. Data handling
3.5. Forecast quality
3.6. The CPU cost ofinitialization schemes
4. Conclusions
Acknowlegments
REFERENCES

HIRLAM Technical Report No. 10: Digital filters for Numerical Weather Prediction HIRLAM Technical Report No. 10: Digital filters for Numerical Weather Prediction

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Date added: 10/24/2014
Date modified: 10/24/2014
Filesize: 12.83 MB
Downloads: 1832

By Peter Lynch

January 1993