Searched for: author:"Segers, A."
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Xu, M. (author), Jin, J. (author), Wang, G. (author), Segers, A. (author), Deng, T. (author), Lin, H.X. (author)
Air quality warning and forecasting systems are usually based on numerical chemical transport models (CTMs). Those dynamic models perform predictions by simulating the life cycles of the atmospheric components, including emission, transport and removal. However, the accuracy of these CTMs are still limited because of many imperfections, e.g.,...
article 2021
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Lopez-Restrepo, S. (author), Yarce, A. (author), Pinel, N. (author), Quintero, O.L. (author), Segers, A. (author), Heemink, A.W. (author)
A data assimilation system for the LOTOS-EUROS chemical transport model has been implemented to improve the simulation and forecast of PM10 and PM2.5 in a densely populated urban valley of the tropical Andes. The Aburrá Valley in Colombia was used as a case study, given data availability and current environmental issues related to population...
article 2020
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Ge, X. (author), Schaap, M. (author), Kranenburg, R. (author), Segers, A. (author), Reinds, G.J. (author), Kros, H. (author), de Vries, W. (author)
Ammonia emissions to the atmosphere have increased substantially in Europe since 1960, largely due to the intensification of agriculture as illustrated by enhanced livestock and use of fertilizers. These associated emissions of reactive nitrogen, particulate matter and acid deposition have contributed to negative societal impacts on human health...
article 2020
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Quesada-Ruiz, S. (author), Attié, J.L. (author), Lahoz, W. (author), Abida, R. (author), Ricaud, P. (author), el Amraoui, L. (author), Zbinden, R. (author), Piacentini, A. (author), Joly, M. (author), Eskes, H. (author), Segers, A. (author), Curier, L. (author), de Haan, J. (author), Kujanpää, J. (author), Oude Nijhuis, A. (author), Tamminen, J. (author), Timmermans, R. (author), Veefkind, P. (author)
We present an observing simulated system experiment (OSSE) dedicated to evaluate the potential added value from the Sentinel-4 and the Sentinel-5P observations on tropospheric ozone composition. For this purpose, the ozone data of Sentinel-4 (Ultraviolet Visible Near-infrared) and Sentinel-5P (TROPOspheric Monitoring Instrument) on board a...
article 2020
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Petersen, A.K. (author), Brasseur, G.P. (author), Bouarar, I. (author), Flemming, J. (author), Gauss, M. (author), Jiang, F. (author), Kouznetsov, R. (author), Kranenburg, R. (author), Mijling, B. (author), Peuch, V.H. (author), Pommier, M. (author), Segers, A. (author), Sofiev, M. (author), Timmermans, R. (author), van der A, R. (author), Walters, S. (author), Xie, Y. (author), Xu, J. (author), Zhou, G. (author)
An operational multimodel forecasting system for air quality has been developed to provide air quality services for urban areas of China. The initial forecasting system included seven state-of-the-art computational models developed and executed in Europe and China (CHIMERE, IFS, EMEP MSC-W, WRF-Chem-MPIM, WRF-Chem-SMS, LOTOS-EUROS, and SILAMtest...
article 2019
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Jin, J. (author), Lin, H. Xiang (author), Segers, A. (author), Xie, Y. (author), Heemink, A. (author)
Data assimilation algorithms rely on a basic assumption of an unbiased observation error. However, the presence of inconsistent measurements with nontrivial biases or inseparable baselines is unavoidable in practice. Assimilation analysis might diverge from reality since the data assimilation itself cannot distinguish whether the differences...
article 2019
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Timmermans, R. (author), Segers, A. (author), Curier, L. (author), Abida, R. (author), Attié, J.L. (author), el Amraoui, L. (author), Eskes, H. (author), de Haan, J. (author), Kujanpää, J. (author), Lahoz, W. (author), oude Nijhuis, A. (author), Quesada-Ruiz, S. (author), Ricaud, P. (author), Veefkind, P. (author), Schaap, M. (author)
We present an Observing System Simulation Experiment (OSSE) dedicated to the evaluation of the added value of the Sentinel-4 and Sentinel-5P missions for tropospheric nitrogen dioxide (NO2). Sentinel-4 is a geostationary (GEO) mission covering the European continent, providing observations with high temporal resolution (hourly). Sentinel-5P is a...
article 2019
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Brasseur, G.P. (author), Xie, Y. (author), Petersen, A.K. (author), Bouarar, I. (author), Flemming, J. (author), Gauss, M. (author), Jiang, F. (author), Kouznetsov, R. (author), Kranenburg, R. (author), Mijling, B. (author), Peuch, V.H. (author), Pommier, M. (author), Segers, A. (author), Sofiev, M. (author), Timmermans, R. (author), van der A, R. (author), Walters, S. (author), Xu, J. (author), Zhou, G. (author)
An operational multi-model forecasting system for air quality including nine different chemical transport models has been developed and provides daily forecasts of ozone, nitrogen oxides, and particulate matter for the 37 largest urban areas of China (population higher than 3 million in 2010). These individual forecasts as well as the mean and...
article 2019
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Escudero, M. (author), Segers, A. (author), Kranenburg, R. (author), Querol, X. (author), Alastuey, A. (author), Borge, R. (author), de la Paz, D. (author), Gangoiti, G. (author), Schaap, M. (author)
Tropospheric <span classCombining double low line"inline-formula">O3</span> remains a major air-quality issue in the Mediterranean region. The combination of large anthropogenic emissions of precursors, transboundary contributions, a warm and dry aestival climate, and topographical features results in severe cases of photochemical pollution....
article 2019
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Jin, J. (author), Lin, H.X. (author), Heemink, A. (author), Segers, A. (author)
In previous studies, a number of model-based dust forecasts and early warning systems have been developed for the prevention of environmental impacts due to dusts. However, the accuracy of the model is limited by imperfect identification of dust emissions, in particular by the friction velocity threshold parameterization in the emission process....
article 2018
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Kranenburg, R. (author), Duyzer, J. (author), Segers, A. (author)
In many industrial regions there is a strong demand for accurate monitoring of the air pollution and its sources. The Rijnmond area around Rotterdam in the Netherlands is an example of an industrial area affected by air pollution through many industrial and traffic activities as well as shipping emissions. In the area the air quality is...
bookPart 2018
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Groot Zwaaftink, C.D. (author), Henne, S. (author), Thompson, R.L. (author), Dlugokencky, E.J. (author), Machida, T. (author), Paris, J.D. (author), Sasakawa, M. (author), Segers, A. (author), Sweeney, C. (author), Stohl, A. (author)
A Lagrangian particle dispersion model, the FLEXible PARTicle dispersion chemical transport model (FLEXPART CTM), is used to simulate global three-dimensional fields of trace gas abundance. These fields are constrained with surface observation data through nudging, a data assimilation method, which relaxes model fields to observed values. Such...
article 2018
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Fu, G. (author), Xiang Lin, H. (author), Heemink, A. (author), Lu, S. (author), Segers, A. (author), van Velzen, N. (author), Lu, T. (author), Xu, S. (author)
In this study, we investigate a strategy to accelerate the data assimilation (DA) algorithm. Based on evaluations of the computational time, the analysis step of the assimilation turns out to be the most expensive part. After a study of the characteristics of the ensemble ash state, we propose a mask-state algorithm which records the sparsity...
article 2017
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Lu, S. (author), Heemink, A. (author), Lin, H.X. (author), Segers, A. (author), Fu, G. (author)
Remote sensing, as a powerful tool for monitoring atmospheric phenomena, has been playing an increasingly important role in inverse modeling. Remote sensing instruments measure quantities that often combine several state variables as one. This creates very strong correlations between the state variables that share the same observation variable....
article 2017
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Abida, R. (author), Attié, J.L. (author), El Amraoui, L. (author), Ricaud, P. (author), Lahoz, W. (author), Eskes, H. (author), Segers, A. (author), Curier, L. (author), De Haan, J. (author), Kujanpaä, J. (author), Oude Nijhuis, A. (author), Tamminen, J. (author), Timmermans, R. (author), Veefkind, P. (author)
We use the technique of Observing System Simulation Experiments (OSSEs) to quantify the impact of spaceborne carbon monoxide (CO) total column observations from the Sentinel-5 Precursor (S-5P) platform on tropospheric analyses and forecasts. We focus on Europe for the period of northern summer 2003, when there was a severe heat wave episode...
article 2017
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Fu, G. (author), Prata, F. (author), Xiang Lin, H. (author), Heemink, A. (author), Segers, A. (author), Lu, S. (author)
Using data assimilation (DA) to improve model forecast accuracy is a powerful approach that requires available observations. Infrared satellite measurements of volcanic ash mass loadings are often used as input observations for the assimilation scheme. However, because these primary satellite-retrieved data are often two-dimensional (2-D) and...
article 2017
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Sofiev, M. (author), Ritenberga, O. (author), Albertini, R. (author), Arteta, J. (author), Belmonte, J. (author), Bernstein, C.G. (author), Bonini, M. (author), Celenk, S. (author), Damialis, A. (author), Douros, J. (author), Elbern, H. (author), Friese, E. (author), Galan, C. (author), Oliver, G. (author), Hrga, I. (author), Kouznetsov, R. (author), Krajsek, K. (author), Magyar, D. (author), Parmentier, J. (author), Plu, M. (author), Prank, M. (author), Robertson, L. (author), Marie Steensen, B. (author), Thibaudon, M. (author), Segers, A. (author), Stepanovich, B. (author), Valdebenito, A.M. (author), Vira, J. (author), Vokou, D. (author)
The paper presents the first modelling experiment of the European-scale olive pollen dispersion, analyses the quality of the predictions, and outlines the research needs. A 6-model strong ensemble of Copernicus Atmospheric Monitoring Service (CAMS) was run throughout the olive season of 2014, computing the olive pollen distribution. The...
article 2017
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Timmermans, R. (author), Kranenburg, R. (author), Manders, A. (author), Hendriks, C. (author), Segers, A. (author), Dammers, E. (author), Denier van der Gon, H. (author), Schaap, M. (author), Dammers, E. (author), Zhang, Q. (author), Wang, L. (author), Liu, Z. (author)
China's population is exposed to high levels of particulate matter (PM) due to its strong economic growth and associated urbanization and industrialization. To support policy makers to develop cost effective mitigation strategies it is of crucial importance to understand the emission sources as well as formation routes responsible for high...
article 2017
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Koffi, E.N. (author), Bergamaschi, P. (author), Karstens, U. (author), Krol, M. (author), Segers, A. (author), Schmidt, M. (author), Levin, I. (author), Vermeulen, A.T. (author), Fisher, R.E. (author), Kazan, V. (author), Klein Baltink, H. (author), Lowry, D. (author), Manca, G. (author), Meijer, H.A.J. (author), Moncrieff, J. (author), Pal, S. (author), Ramonet, M. (author), Scheeren, H.A. (author), Williams, A.G. (author)
We evaluate the capability of the global atmospheric transport model TM5 to simulate the boundary layer dynamics and associated variability of trace gases close to the surface, using radon (222Rn). Focusing on the European scale, we compare the boundary layer height (BLH) in the TM5 model with observations from the National Oceanic and...
article 2016
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van der Eerden, F. (author), Wessels, P. (author), Segers, A. (author), Basten, T. (author), de Coensel, B. (author), Botteldooren, D. (author), Van Renterghem, T. (author), Dekoninck, L. (author), Spruytte, V. (author), Makovec, A. (author)
The distance between noise sources at a large industrial area and a local community can be in the order of several kilometers. At such distances it may not be clear which sources are the main contributors to possible noise complaints. A long-term monitoring project is described that measures the sound sources in the industrial area and the sound...
conference paper 2016
Searched for: author:"Segers, A."
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