Thesis defence S. Lu: volcanic ash

01 March 2017 | 10:00
location: Aula, TU Delft
by Webredactie

Variational Data Assimilation of Satellite Observations to Estimate Volcanic Ash Emissions. Promotor 1: H.X. Lin (EWI), Promotor 2: A.W. Heemink (EWI).

Volcanic ash can damage the engines of jet planes and disturb aviation. Huge economic losses caused by a big volcanic eruption could have been reduced, given good prediction of the volcanic ash transport. Due to the large uncertainty in the ash emission source (up to 200% sometimes), a good estimate of the emissions can greatly improve the accuracy of the forecast of the ash cloud.
This thesis investigates the potential of using variational data assimilation approaches to reconstruct the vertical profile of the volcanic ash emissions by assimilating satellite data. Trajectory-based 4-D variational data assimilation (Trj4DVar) approach is proposed in this thesis as a good solution.  In addition to satellite data, the new approach has been modified to make it possible to assimilate other data from ground-based observations. Guidance and suggestions has been provided on the preprocessing and the better use of satellite data. Based on all the results of the study above, an accurate estimate of the emission and a reliable forecast have been achieved.

More information?
For access to theses by the PhD students you can have a look in TU Delft Repository, the digital storage of publications of TU Delft. Theses will be available within a few weeks after the actual thesis defence. 

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