Proceedings - C-SRNWP Project

Fig. 2: Case study for 10 June 2006 for Norway. This is a typical example of a type of
situation during the snow melt season which has presented long-standing problems for Nordic
forecasters, which can be relieved by the introduction of the new snow and forest scheme. On
the left is shown a T2m map for HIRLAM version 7.0, in the middle the corresponding T2m
field for version 7.0 with the new snow scheme. To the right a satellite image for the same
time. In the version without the new scheme, near-surface temperatures are too high and
snow is erroneously melted over large areas in the day time, while with the new scheme the
snow is correctly maintained in the model.
Table 1: Contributions to GLAMEPS development from HIRLAM and ALADIN participants.
Method INM HMS KNMI DMI ZAMG Met.no SMHI LTM
Downscaling of global EPS X X
Initial and lateral boundary
perturbations according to SLAF X
(Scaled Lagged Averaging
Forecasting)
Initial perturbations based on
global singular vectors (and
X
X
targeted singular vectors)
Initial perturbations based on
HIRLAM singular vectors X X X
Initial perturbations based on
ETKF X X
Lateral boundary perturbations
from global model EPS
X
Lateral boundary perturbations
based on stationary forecast error
X
statistics
Lower boundary condition
Perturbations X X
Model tendency perturbations
base don forcing singular vectors X X
Multi-physics parametrizations
X
Stochastic physics X X
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