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Winter-time wind verification of HIRLAM in Sodankyl

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Wind speed, direction and veering in ABL. Impact of horizontal resolution of HIRLAM ... Wind veering, ulev40 5m/s. Wind veering, ulev40 5m/s. Wind direction, ... – PowerPoint PPT presentation

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Title: 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
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