Assimilating aircraft-based measurements to improve forecast accuracy of volcanic ash transport

Assimilating aircraft-based measurements to improve forecast accuracy of volcanic ash transport

Fu, G.
Lin, H.X.
Heemink, A.W.
Segers, A.J.
Lu, S.
Palsson, T.

Electrical Engineering, Mathematics and Computer Science

Applied mathematics

2015-05-29

The 2010 Eyjafjallajokull volcano eruption had serious consequences to civil aviation. This has initiated a lot of research on volcanic ash transport forecast in recent years. For forecasting the volcanic ash transport after eruption onset, a volcanic ash transport and diffusion model (VATDM) needs to be run with Eruption Source Parameters (ESP) such as plume height and mass eruption rate as input, and with data assimilation techniques to continuously improve the initial conditions of the forecast. Reliable and accurate ash measurements are crucial for providing a successful ash clouds advice. In this paper, simulated aircraft-based measurements, as one type of volcanic ash measurements, will be assimilated into a transport model to identify the potential benefit of this kind of observations in an assimilation system. The results show assimilating aircraft-based measurements can significantly improve the state of ash clouds, and further providing an improved forecast as aviation advice. We also show that for advice of aeroplane flying level, aircraft-based measurements should be preferably taken from this level to obtain the best performance on it. Furthermore it is shown that in order to make an acceptable advice for aviation decision makers, accurate knowledge about uncertainties of ESPs and measurements is of great importance.

volcanic ash forecast
aircraft-based measurements
data assimilation
uncertainties

http://resolver.tudelft.nl/uuid:8f30895f-c935-46a6-986c-c388dba3501d

Elsevier

2016-05-27

1352-2310

Atmospheric environment, 115, 2015; postprint version

Institutional Repository

journal article

(c) 2015 The Authors and Elsevier