...
- For all the four assimilated parameters, accuracy at the downstream locations is improved. The accuracy of Phosphate estimate at the assimilation station is however deteriorated. Perhaps this is due to the interaction between Phosphate and the other assimilated parameters? Suggestion: perform a twin experiment where only Phosphate is assimilated. Suggestion from NIER (tele-discussion, 24-11-2016): the observational standard deviation of Phosphate is too large, hence try a smaller standard deviation.
- At upstream locations, the accuracy of Algal Cyanobacteria estimate of the deterministic run is high, but it deteriorates at assimilation stations. Perhaps because the noise the input location just upstream of the assimilation stations happens to be larger than the others. Still needs to be checked.
- Water temperature is affected by the noise although it is not included in the state vector definition. Assimilating the four water quality parameters doesn't help improve the accuracy of water temperature estimates. At downstream stations, the error is less than 0.5 oC, which is probably practically small.
