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Lu, S. (author), Lin, H.X. (author), Heemink, A.W. (author), Segers, Arjo (author), Fu, Guangliang (author)In this paper, we reconstruct the vertical profile of volcanic ash emissions by assimilating satellite data and ground-based observations using a modified trajectory-based 4D-Var (Trj4DVar) approach. In our previous work, we found that the lack of vertical resolution in satellite ash column data can result in a poor estimation of the injection...journal article 2016