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Impact experiments and other studies
AMVs are used in many NWP models worldwide. Much research
and development work is carried out to adapt to new AMV
products and to improve the way the data is used. Included below
are summaries of some of the recent work carried out. Most of this
work is carried out independently of the NWP SAF.
We are interested in
including the results of more AMV studies; if you have a report
you would like to link from this site, please supply details using the
Feedback Form.
| Impact Experiments |
Experiment |
Location |
Experiment details |
Main results |
Date report produced |
More details |
New AMV error scheme |
Met Office |
6-h
4DVAR
2007 |
Small positive impact |
Apr 2008 |
|
Impact of MODIS polar winds |
Met Office |
6-h
3DVAR
2004 |
Positive impact |
Jun 2006 |
|
AMV superobbing scheme |
Met Office |
6-h
3DVAR
2004 |
Neutral to slightly negative impact. |
Sep 2004 |
|
Impact of MODIS Polar Winds |
ECMWF |
12-h
4DVAR
2001-2 |
Positive forecast impact, particularly
over poles and Europe. Neutral impact in SH. |
Oct 2003 |
|
Mesoscale Upgrade - including assimilation
of Meteosat-6 rapid scan winds |
Met Office |
3DVAR Mesoscale
2003 |
Meteosat-6 not trialled independently.
Decision to use based on monitoring. |
Feb 2004 |
|
Doubling current observation errors
applied to all satellites |
Met Office |
6-h 3DVAR
2001 |
Most forecast parameters neutral
to positive. Best impact in SH. Resulted in operational
change |
Jun 2002 |
|
Impact of AMVs from
Meteosat-5 over the Indian Ocean |
ECMWF |
12-h
4DVAR
2000-1 |
Neutral to positive forecast impact,
particularly positive in SH. Met-5 winds strengthen
the tropical easterly jet |
|
|
Meteosat high-resolution visible & water
vapour winds, making use of the Quality Indicator,
and including GOES high-density winds |
Met Office |
6-h
3DVAR
1999 |
Unable to obtain positive impact
in any hemisphere using winds so dense |
Mar 2000 |
|
