HIRLAM documentation

A snowmodel intended for ISBA, S. Gollvik

Four-dimensional variational data assimilation for a limited area model Xiang-Yu Huang, Xiaohua Yang, Nils Gustafsson, Kristian Sten Mogensen and Magnus Lindskog, December 2002.

Author: E. Kallen

Contents:

Chapter 1 Introduction

Chapter 2 The Forecast Model

2.1 Adiabatic Formulation

2.1.1 The Continuous Equation

2.1.2 Finite difference scheme

2.1.3 The semi-implicit time scheme

2.1.4 Horizontal diffusion

2.1.5 Boundary relaxation scheme

2.1.6 Statistics

2.1.7 Extra Scalars

2.1.8 The semi-Lagrangian time scheme

2.2 Physical parameterization

2.2.1 Radiation

2.2.2 Vertical diffusion

2.2.2 A Theory and general procedure

2.2.2 B Diffusion coefficients

2.2.2 C Additional computations at the ground

2.2.2 D Transfer of information

2.2.3 Condensation and precipitation

2.2.3 A General

2.2.3 B Convective release of latent heat and associated cloud cover

2.2.3 C Stratiform condensation

2.2.3 D Parameterization of microphysical processes

2.2.3 E Numerical treatment of the governing equations

2.2.5 Soil Processes

2.2.6 Diagnostic calculation of near surface parameters

2.3 Dynamic part

2.3.1 Algorithm and calling tree for the dynamics

2.3.2 Physical parameterization

2.4 Data organization

Chapter 3 Initialization

3.1 The implicit normal mode initialization scheme

3.1.1 Introduction

3.1.2 Linear equation system

3.1.3 Implicit NMI scheme

3.2 Computer code organization

3.3 Data organization

3.3.1 Table: The input namelists namrun for initialization

Chapter 4 The Analysis system

4.1 Analysis of wind, mass and humidity fields

4.1.1 The ECMWF analysis scheme and HIRLAM modifications - an introduction

4.1.2 Adaptations to the limited area version

4.1.3 Adaptations to the HIRLAM file structure

4.1.4 Setting of file unit numbers

4.1.6 Adaptations to water vapour saturations pressure calculations

4.1.7 The script Prepob

4.1.8 De-staggering of wind components of the first guess and staggering of wind components of analysis increments

4.1.9 Creation of HIRLAM analysis coefficient files

4.2 Analysis of sea surface temperature and ice coverage

4.2.1 General features

4.2.2 Input of sea-surface temperature and ice coverage data from the Swedish Meteorological and Hydrological Institute

4.2.3 Method of computations

4.2.4 Computer code organization

4.2.5 Data organization

Chapter 5 Data structures

5.1. Fields

5.1.1 General

5.1.2 Definition of mandatory descriptor record (DDR)

5.1.3 GRIB format

5.1.4 Programs for packing and unpacking

5.1.5 Indicator of parameter

5.2 Data Structures - Observations (BUFR)

5.2.2 BUFR decoding; Porgram Library BUFR

5.2.3 BUFR Tables

5.2.4 Script Make BUFRtabs

5.2.5 Program BUTA

5.3 Statistics files

5.3.1 General features of the statistics files

5.3.2 Structure and contents

5.3.3 Transmission of statistics files

5.3.4 Contents of the statistics files

5.3.5 FORTRAN formats for records in the statistics files

Chapter 6 Pre-processing

6.1 Horizontal interpolation

6.1.1 Selection of boundary files

6.1.2 File format transformation

6.1.3 Horizontal interpolation

6.1.4 Bitmaps

6.2 Vertical interpolation from presssure levels to HIRLAM hybrid levels

6.2.1 Notations

6.2.2 Calculation of surface pressure

6.2.3 Vertical interpolations

6.2.4 Program organization and data organization

6.3 Vericatl interpolation from one hybrid level system to another hybrid level system

6.3.1 Notations

6.3.2 Estimation of a proliminary HIRLAM surface pressure

6.3.3 Vertical interpolation of temperature, humidity and wind components

6.3.4 Computation of the final HIRLAM surface pressure

6.3.6 Program organization and data organization

Chapter 7 Post-processing

7.1 Vertical interpolation and extrapolation

7.2 Mean sea level pressure

7.3 Time Series Files

7.3.1 Generating Time Series Files

7.3.1.1 Initialising - INITRF

7.3.1.2 Copy data to Time Sseries buffer - CPDTRF

7.3.1.3 Writing the Time Series File - WRITRF

7.3.2 Reading Time Series Files

7.3.2.1 Get informatino on Time Series File - GINFSF

7.3.2.2 Reading Single Level Time Series - RDSESF

7.3.2.3 Reading Multi Level Time Series - RDMETF/RAMETF

7.4 Vertical velocity

7.5 Relative humidity

7.6 Surface fluxes

7.7 Computer code organization and namelist parameters

Chapter 8 The surface orography and climate system

8.1 Introduction

8.2 Orography, surface roughness and fraction of land

8.3 Surface climate fields

8.4 HIRLAM climate data files

Chapter 9 General verification against observations

Chapter 10 The HIRLAM system under UNIX, a unified script system

 

 

 

 

 

 

 

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