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Multivariate and Multiscale Data Assimilation in Terrestrial Systems: A Review
Forschungszentrum Jülich GmbH, Institute of Bio- and Geosciences: Agrosphere (IBG 3), Jülich 52425, Germany
Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia
Cold and Arid Regions Environment Engineering Research Institute (CAREERI), CAS, Lanzhou 730000, China
* Author to whom correspondence should be addressed.
Received: 11 October 2012; in revised form: 19 November 2012 / Accepted: 19 November 2012 / Published: 26 November 2012
Abstract: More and more terrestrial observational networks are being established to monitor climatic, hydrological and land-use changes in different regions of the World. In these networks, time series of states and fluxes are recorded in an automated manner, often with a high temporal resolution. These data are important for the understanding of water, energy, and/or matter fluxes, as well as their biological and physical drivers and interactions with and within the terrestrial system. Similarly, the number and accuracy of variables, which can be observed by spaceborne sensors, are increasing. Data assimilation (DA) methods utilize these observations in terrestrial models in order to increase process knowledge as well as to improve forecasts for the system being studied. The widely implemented automation in observing environmental states and fluxes makes an operational computation more and more feasible, and it opens the perspective of short-time forecasts of the state of terrestrial systems. In this paper, we review the state of the art with respect to DA focusing on the joint assimilation of observational data precedents from different spatial scales and different data types. An introduction is given to different DA methods, such as the Ensemble Kalman Filter (EnKF), Particle Filter (PF) and variational methods (3/4D-VAR). In this review, we distinguish between four major DA approaches: (1) univariate single-scale DA (UVSS), which is the approach used in the majority of published DA applications, (2) univariate multiscale DA (UVMS) referring to a methodology which acknowledges that at least some of the assimilated data are measured at a different scale than the computational grid scale, (3) multivariate single-scale DA (MVSS) dealing with the assimilation of at least two different data types, and (4) combined multivariate multiscale DA (MVMS). Finally, we conclude with a discussion on the advantages and disadvantages of the assimilation of multiple data types in a simulation model. Existing approaches can be used to simultaneously update several model states and model parameters if applicable. In other words, the basic principles for multivariate data assimilation are already available. We argue that a better understanding of the measurement errors for different observation types, improved estimates of observation bias and improved multiscale assimilation methods for data which scale nonlinearly is important to properly weight them in multiscale multivariate data assimilation. In this context, improved cross-validation of different data types, and increased ground truth verification of remote sensing products are required.
Keywords: data assimilation; multiscale; multivariate; modeling; Ensemble Kalman Filter; Particle Filter; variational methods
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Montzka, C.; Pauwels, V.R.N.; Franssen, H.-J.H.; Han, X.; Vereecken, H. Multivariate and Multiscale Data Assimilation in Terrestrial Systems: A Review. Sensors 2012, 12, 16291-16333.
Montzka C, Pauwels VRN, Franssen H-JH, Han X, Vereecken H. Multivariate and Multiscale Data Assimilation in Terrestrial Systems: A Review. Sensors. 2012; 12(12):16291-16333.
Montzka, Carsten; Pauwels, Valentijn R.N.; Franssen, Harrie-Jan H.; Han, Xujun; Vereecken, Harry. 2012. "Multivariate and Multiscale Data Assimilation in Terrestrial Systems: A Review." Sensors 12, no. 12: 16291-16333.