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The usage of IMS is a bit tricky in the current operational system. IMS is not used on IMS mask in 2D-OI instead of rejecting IMS directly. So large departures can be calculated on IMS mask and they lead to large increments outside IMS mask. I found that suspicious increments can be accumulated on IMS mask by the following processes:
- Positive increments by in situ observation at 6, 12, 18 UTC and they propagate to on IMS mask
- Negative increments around in situ observation by large departures on IMS mask at 0 UTC
- Positive increments again by in situ observation at 6, 12, 18 UTC ...
In order to reduce such suspicious increments, the following changes have been applied:
- a
- a
- a
| control | before modifications | after modifications |
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