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- Agusti-Panareda, A. (author), McNorton, J. (author), Balsamo, G. (author), Bacour, C. (author), Bastrikov, V. (author), Bidlot, J. (author), Bonan, B. (author), Bousserez, N. (author), Boussetta, S. (author), Broquet, G. (author), Brunner, D. (author), Calvet, J.C. (author), Cantareollo, L. (author), Ciais, P. (author), Chen, H. (author), Chevallier, F. (author), Choulga, M. (author), Crevoisier, C. (author), Denier van der Gon, H.A.C. (author), Diamantakis, M. (author), Dutra, E. (author), Engelen, R. (author), Flemming, J. (author), Arduini, G. (author), Germineaud, C. (author), Guevara, M. (author), Granier, C. (author), Houweling, S. (author), Janssens-Maenhout, G. (author), Huijnen, V. (author), Jung, M. (author), Kaminski, T. (author), Kipling, Z. (author), Kivi, R. (author), Koffi, E. (author), Kutsch, W. (author), Langerock, B. (author), Kountouris, P. (author), Krol, M. (author), Lopes, F. (author), Maignan, F. (author), Marshall, J. (author), Massart, S. (author), Papale, D. (author), Parrington, M. (author), Perruche, C. (author), Peters, G. (author), Roxana Petrescu, A.M. (author), Peters, W. (author), Peylin, P. (author), Peuch, V.H. (author), Ramonet, M. (author), de Rosnay, P. (author), Scholze, M. (author), Segers, A. (author), Vermeulen, A. (author), Walther, S. (author), Warnake, T. (author), Weston, P. (author) conference paper 2022
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Kangasaho, V. (author), Tsuruta, A. (author), Backman, L. (author), Makinen, P. (author), Houweling, S. (author), Segers, A. (author), Krol, M. (author), Dlugokencky, E.J. (author), Michel, S. (author), White, J.W.C. (author), Aalto, T. (author)This study investigates the contribution of different CH4 sources to the seasonal cycle of δ13C during 2000–2012 by using the TM5 atmospheric transport model, including spatially varying information on isotopic signatures. The TM5 model is able to produce the background seasonality of δ13C, but the discrepancies compared to the observations...article 2022
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Fang, L. (author), Jin, J. (author), Segers, A. (author), Lin, H.X. (author), Pang, M. (author), Xiao, C. (author), Deng, T. (author), Liao, H. (author)With the explosive growth of atmospheric data, machine learning models have achieved great success in air pollution forecasting because of their higher computational efficiency than the traditional chemical transport models. However, in previous studies, new prediction algorithms have only been tested at stations or in a small region; a large...article 2022
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Pandey, S. (author), Houweling, S. (author), Segers, A. (author)Atmospheric inversions are used to constrain emissions of trace gases using atmospheric mole-fraction measurements. The four-dimensional variational (4DVAR) inversion approach allows optimization of emissions at a higher temporal and spatial resolution than ensemble or an alytical approaches but provides limited opportunities for scalable...article 2022
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Jin, J. (author), Pang, M. (author), Segers, A. (author), Han, W. (author), Fang, L. (author), Li, B. (author), Feng, H. (author), Lin, H.X. (author), Liao, H. (author)Last spring, super dust storms reappeared in East Asia after being absent for one and a half decades. The event caused enormous losses in both Mongolia and China. Accurate simulation of such super sandstorms is valuable for the quantification of health damage, aviation risks, and profound impacts on the Earth system, but also to reveal the...article 2022
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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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van der Graaf, S. (author), Dammers, E. (author), Segers, A. (author), Kranenburg, R. (author), Schaap, M. (author), Shephard, M.W. (author), Erisman, J.W. (author)Atmospheric levels of ammonia (NH3) have substantially increased during the last century, posing a hazard to both human health and environmental quality. The atmospheric budget of NH3, however, is still highly uncertain due to an overall lack of observations. Satellite observations of atmospheric NH3 may help us in the current observational and...article 2021
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Jin, J. (author), Segers, A. (author), Lin, H.X. (author), Henzing, B. (author), Wang, X. (author), Heemink, A. (author), Liao, H. (author)When calibrating simulations of dust clouds, both the intensity and the position are important. Intensity er rors arise mainly from uncertain emission and sedimenta tion strengths, while position errors are attributed either to imperfect emission timing or to uncertainties in the trans port. Though many studies have been conducted on the cal...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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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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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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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 O3 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. Chemical transport models (CTMs) are essential tools for...article 2019
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Jin, J. (author), xiang Lin, H. (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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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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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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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