Winter-time wind verification of HIRLAM in Sodankyl

1
Winter-time wind verification of HIRLAM in
SodankyläPriit Tisler, UH/FMI

• Working meeting on Stable Boundary Layer
  Parameterizations 2 November 2005
• HIRLAM - NetFAM

2
Objectives

• Wind speed, direction and veering in ABL
• Impact of horizontal resolution of HIRLAM
• Impact of model code improvements
• Surface stress turning etc. (Newsletter No.47)
• Traditional verification, HIRLAM vs. measurements
  (Sodankylä)

3
Model data
4
Details of used meteorological data

• Period of interest 4 months, (nov.04 feb.05)
• Except experimental RCRA 2 months, (dec.04,
  jan.05)
• HIRLAM 6 h forecasts, int. 6h
• Sodankylä soundings, int.12h
• Sodankylä AWS data, int. 6h

5
Wind speed at lev40
6
Wind speed at lev40
7
Wind speed at 10 m
8
Wind speed at 10 m
9
Wind direction at lev40
10
Wind direction at lev40
11
Wind direction at lev30 (850 hPa)
12
Wind veering, ulev40 gt 5m/s
13
Wind veering, ulev40 gt 5m/s
14
Wind direction, lev40 vs. AWS
15
Wind direction, lev40 vs. AWS
16
Wind veering
17
Wind veering
18
Wind veering, uAWS gt 5m/s
19
Summaryforecast for winter period 05/06

• Grid spacing small effect

20
Summaryforecast for winter period 05/06

• Grid spacing small effect
• New RCR (RCRA), Finland (inland)
• increased 10m (also lowest level) wind speed
• reduced bias (positive) of 10m wind direction
• increased wind turning in ABL