Assessment and tuning of data assimilation systems using passive observations.Published in:Quarterly Journal of the Royal Meteorological Society, 2016, v. 142, n. 701, p. 3001, doi. 10.1002/qj.2882By:Marseille, Gert‐Jan;Barkmeijer, Jan;de Haan, Siebren;Verkley, WimPublication type:Article