Implementation date |
9 November 2010
|
See Newsletter No.126 |
Key characteristics of our current forecasting system |
|
Resolution |
Horizontal (unchanged)
- Atmospheric
- HRES: TL1279
- ENS: Leg A TL399
- Wave
- HRES: 0.36 degrees
- ENS: 0.5 degrees
- LAW: 0.1 degrees
|
Vertical (unchanged)
|
Data set affected |
|
Meteorological changes |
- Five-species prognostic microphysics scheme, introducing cloud rain water content, and cloud ice water content as new model variables.
- Retuning and simplification of convective entrainment/detrainment and land/sea dependent threshold for precipitation
- Retuning of subgrid-scale orographic gravity wave drag
- Adjustment to diffusion in stable boundary Iayers near the surface
- All-sky improvements of microwave radiance assimilation
- Adaptation to neutral wind of the observation operator for scatterometer data
- New soil-moisture analysis scheme (SEKF, simplified ensemble Kalman filter)
- New snow analysis based on 0I (Optimum Interpolation), and upgrade of NESDIS snow cover data to 4 km resolution.
- Monthly varying climatology of leaf area index (LAI) based on MODIS data
- The 4D-Var of the Early Delivery suite performs 2 rather than 3 updates of the outer loop
ENS
- Revision of stochastically perturbed physical tendencies
- Introduction of spectral stochastic backscatter scheme
- Retuned initial perturbation amplitudes
|
Meteorological impacts |
- Benefit in terms of objective scores in the medium range in both hemispheres, particularly in the upper troposphere.
- positive verification for winds against observations, whereas verification against analyses tends to be negative in the shorter range, which can be explained by higher variability in the analysed wind fields.
- improved snow analysis issues that affected the analysed snow depth on the 2009/2010 winter
- modifications to the stable boundary layer improve the diurnal cycle of 2m temperature, especially some reduction of the night-time cold bias over Europe
- improved tropospheric humidity analysis
ENS
- improved probabilistic scores in the extra-tropics
- better tuned spread-skill relationship - especially for 500 hPa geopotential height in the earlier forecast ranges (days 1-5)
|
Technical changes |
|
Model ID |
- Atmospheric: 139
- Ocean wave: 107
- Limited-area ocean wave: 207
|
New disseminated model output |
8
|
Surface run off
|
sro
|
m
|
sfc
|
fc, full EPS
|
9
|
Sub-surface run off
|
ssro
|
m
|
sfc
|
fc, full EPS
|
66
|
Leaf area index, low vegetation
|
lai_lv
|
m**2/m**2
|
sfc
|
an, fc
|
67
|
Leaf area index, high vegetation
|
lai_hv
|
m**2/m**2
|
sfc
|
an, fc
|
75
|
Cloud Rain Water Content
|
crwc
|
kg/kg
|
ml
|
an, fc, full EPS
|
76
|
Cloud Snow Water Content
|
cswc
|
kg/kg
|
ml
|
an, fc, full EPS
|
228003
|
Friction velocity
|
zust
|
m/s
|
sfc
|
fc
|
228023
|
Cloud Base Height
|
cbh
|
m
|
sfc
|
fc, full EPS
|
228024
|
Zero Degree Level
|
deg0l
|
m
|
sfc
|
fc, full EPS
|
228131
|
Neutral Wind at 1m u- component
|
u10n
|
m/s
|
sfc
|
fc
|
228132
|
Neutral Wind at 1m v- component
|
v10n
|
m/s
|
sfc
|
fc
|
|
Discontinued disseminated model output |
- |
|
e-suite experiment number |
0051 |
|