Introduction : This calculator calculates an analysis field by comparing the first guess Xg and the observation Xo to their errors, where X is equal to M for wind speed, P for pressure, or Z for Geopotential height. This calculation gives a more accurate result for the analysis field. In this calculator, you have 4 input values:
- Observed (Xo)
- First Guess (Xg)
- Error Observed (eo)
- Error First Guess (eg)
The algorithm for the Objective Optimum Interpolation is:
| Table 14-1. Typical errors of weather observations (from ECMWF
Meteor. Bulletin M3.2, 1994) |
|
|
| Wind errors in the lower troposphere |
(m/s) |
| Surface stations and ship obs |
3 to 4 |
|
Drifting buoy
|
5 to 6 |
| Rawinsonde, pilot bal., wind prof. |
2 to 3 |
| Aircraft and satellite |
3 |
|
| Pressure errors |
(kPa) |
| Surface weather stations |
0.1 |
| Ship and drifting buoy |
0.2 |
| S. Hemisphere manual analysis |
0.4 |
|
| Geopotential height errors |
(m) |
| Surface weather stations |
7 |
| Ship and drifting buoy |
14 |
| S. Hemisphere manual analysis |
32 |
| Rawinsonde |
13 to 26 |
|
|
Objective Optimum Interpolation Equation
|