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Jin, J. (author), Henzing, B. (author), Segers, A.J. (author)Satellite-based aerosol optical depth (AOD) has gained popularity as a powerful data source for calibrating aerosol models and correcting model errors through data assimilation. However, simulated airborne particle mass concentrations are not directly comparable to satellite-based AODs. For this, an AOD operator needs to be developed that can...article 2023
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Sturm, P.O. (author), Manders, A.M.M. (author), Janssen, R.H.H. (author), Segers, A.J. (author), Wexler, A.S. (author), Xiang Lin, H. (author)The chemical transport model LOTOS-EUROS uses a volatility basis set (VBS) approach to represent the formation of secondary organic aerosol (SOA) in the atmosphere. Inclusion of the VBS approximately doubles the dimensionality of LOTOS-EUROS and slows computation of the advection operator by a factor of two. This complexity limits SOA...article 2022
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Pseftogkas, A. (author), Koukouli, M.E. (author), Segers, A.J. (author), Manders, A.M.M. (author), van Geffen, J. (author), Balis, D. (author), Meleti, C. (author), Stavrakou, T. (author), Eskes, H. (author)The aim of this paper is to evaluate the surface concentration of nitrogen dioxide (NO2) inferred from the Sentinel-5 Precursor Tropospheric Monitoring Instrument (S5P/TROPOMI) NO2 tropospheric column densities over Central Europe for two time periods, summer 2019 and winter 2019–2020. Simulations of the NO2 tropospheric vertical column...article 2022
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- Leguijt, G. (author), Maasakkers, J.D. (author), Denier van der Gon, H.A.C. (author), Segers, A.J. (author), Borsdorff, T. (author), Aben, I. (author) conference paper 2022
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van der Graaf, S. (author), Dammers, E. (author), Segers, A.J. (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 2022
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Timmermans, R.M.A. (author), Segers, A.J. (author), Dammers, E. (author), Jorba, O. (author), Bowdalo, D. (author), Fagerli, H. (author), Valdebenito, A. (author), Colette, A. (author), Descombes, G. (author), Kouznetsov, R. (author), Uppstu, A. (author), Schaap. M., (author)Within Copernicus Atmosphere Monitoring Service (CAMS) an ensemble of 9 chemistry transport models provides daily analyses and forecasts, as well as annual reanalyses over Europe. The CAMS_61 project was developed to provide development plans, guidelines and tools for the upgrade of the models within this regional air quality service. In this...conference paper 2022
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Deng, T. (author), Manders-Groot, A.M.M. (author), Segers, A.J. (author), Bai, Y. (author), Lin, H.Q. (author)Tropospheric ozone is a secondary pollutant which can affect human health and plant growth. In this paper, we investigated transferred convolutional neural network long short-term memory (TL-CNN-LSTM) model to predict ozone concentration. Hourly CNN-LSTM model is used to extract features and predict ozone for next hour, which is superior to...conference paper 2021
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Skoulidou, I. (author), Koukouli, M.E. (author), Manders, A.M.M. (author), Segers, A.J. (author), Karagkiozidis, D (author), Gratsea, M. (author), Balis, D. (author), Bais, A. (author), Gerasopoulos, E. (author), Stavrakou, T. (author), van Geffen, J. (author), Eskes, H. (author), Richter, A. (author)The evaluation of chemical transport models, CTMs, is essential for the assessment of their performance regarding the physical and chemical parameterizations used. While regional CTMs have been widely used and evaluated over Europe, their validation over Greece is limited. In this study, we investigate the performance of the Long Term Ozone...article 2021
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Koukouli, M.E. (author), Skoulidou, I. (author), Karavias, A. (author), Parcharidis, I. (author), Balis, D. (author), Manders-Groot, A.M.M. (author), Segers, A.J. (author), Eskes, H. (author), van Geffen, J. (author)The unprecedented order, in modern peaceful times, for a near-total lockdown of the Greek population as a means of protection against severe acute respiratory syndrome coronavirus 2, commonly known as COVID-19, has generated unintentional positive side-effects with respect to the country’s air quality levels. Sentinel-5 Precursor/Tropospheric...article 2021
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Skoulidou, I (author), Koukouli, M.E. (author), Segers, A.J. (author), Manders-Groot, A.M.M. (author), Balis, D. (author), Stavrakou, T. (author), van Geffen, J. (author), Eskes, H. (author)In this work, we investigate the ability of a data assimilation technique and space-borne observations to quantify and monitor changes in nitrogen oxides (NOx) emissions over North-Western Greece for the summers of 2018 and 2019. In this region, four lignite-burning power plants are located. The data assimilation technique, based on the Ensemble...article 2021
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Lopez-Restrepo, S. (author), Nino-Ruiz, E.D. (author), Guzman-Reyes, L.G. (author), Yarce, A. (author), Quintero, O.L. (author), Pinel, N. (author), Segers, A.J. (author), Heemink, A.W. (author)In this paper, we propose an efficient and practical implementation of the ensemble Kalman filter via shrinkage covariancematrix estimation. Our filter implementation combines information brought by an ensemble of model realizations, and thatbased on our prior knowledge about the dynamical system of interest. We perform the combination of both...article 2021
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Szenasi, B. (author), Berchet, A. (author), Broquet, G. (author), Segers, A.J. (author), Denier van der Gon, H.A.C. (author), Krol, M. (author), Hullegie, J.J.S. (author), Kiesow, A. (author), Gunther, D. (author), Roxana Petrescu, A.M. (author), Saunois, M. (author), Bousquet, P. (author), Pison, I. (author)This study aims at estimating errors to be accounted for in atmospheric inversions of methane (CH4) emissions at the European scale. Four types of errors are estimated in the concentration space over the model domain and at selected measurement sites. Furthermore, errors in emission inventories are estimated at country and source sector scales....article 2021
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Pseftogkas, A. (author), Koukouli, M.E. (author), Skoulidou, I. (author), Balis, D. (author), Meleti, C. (author), Stavrakou, T. (author), Falco, L. (author), van Geffen, J. (author), Eskes, H. (author), Segers, A.J. (author), Manders, A.M.M. (author)The aim of this paper is to apply a new lane separation methodology for the maritime sector emissions attributed to the different vessel types and marine traffic loads in the Mediterranean and the Black Sea defined via the European Marine and Observation Data network (EMODnet), developed in 2016. This methodology is implemented for the first...article 2021
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Daellenbach, K.R. (author), Uzu, G. (author), Jiang, J. (author), Casagnes, L.E. (author), Leni, Z. (author), Vlachou, A. (author), Stefenelli, G. (author), Canonaco, F. (author), Weber, S. (author), Segers, A.J. (author), Schaap, M. (author), Favez, O. (author), Albinet, A. (author), Aksoyoglu, S. (author), Dommen, J. (author), Geiser, M. (author), Baltensperger, U. (author), El-Haddad, I. (author), Jaffrezo, J.L. (author), Prevot, A.S.H. (author)Particulate matter is a component of ambient air pollution that has been linked to millions of annual premature deaths globally1–3 . Assessments of the chronic and acute efects of particulate matter on human health tend to be based on mass concentration, with particle size and composition also thought to play a part4 . Oxidative potential has...article 2020
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Haussaire, J.M. (author), Brunner, D. (author), Segers, A.J. (author)This report presents the high-resolution nature runs covering a domain centred around the town of Berlin. These nature runs are nested in the European runs (described in the first part of Deliverable D2.4), themselves nested in the global Tier-1 runs (Deliverable D2.2). These simulations are produced using two separate models, COSMO-GHG and...report 2020
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Jin, J. (author), Segers, A.J. (author), Liao, H. (author), Heemink, A. (author), Kranenburg, R. (author), Liu, H.X. (author)Emission inversion using data assimilation fundamentally relies on having the correct assumptions about the emission background error covariance. A perfect covariance accounts for the uncertainty based on prior knowledge and is able to explain differences between model simulations and observations. In practice, emission uncertainties are...article 2020
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Saunois, M. (author), Stavert, A.R. (author), Poulter, B. (author), Bousquet, P. (author), Canadell, J.G. (author), Jackson, R.B. (author), Raymond, P.A. (author), Dlugokencky, E.J. (author), Houweling, S. (author), Patra, P.K. (author), Ciais, P. (author), Arora, V.K. (author), Bastviken, D. (author), Bergamaschi, P. (author), Blake, D.R. (author), Brailsford, G. (author), Bruhwiller, L. (author), Carlson, K.M. (author), Carroll, M. (author), Castaldi, S. (author), Chandra, N. (author), Crevoisier, C. (author), Crill, P.M. (author), Covey, K. (author), Curry, C.L. (author), Etiope, G. (author), Frankenberg, C. (author), Gedney, N. (author), Hegglin, M.I. (author), Hoglund-Isaksson, L. (author), Hugelius, G. (author), Ishizawa, M. (author), Ito, A. (author), Janssens-Maenhout, G. (author), Jensen, K.M. (author), Joos, F. (author), Kleinen, T. (author), Krummel, P.B. (author), Langenfeld, R.L. (author), Laruelle, G. (author), Liu, L. (author), Machida, T. (author), Maksyutov, S. (author), Mc Donald, K.C. (author), Mc Norton, J. (author), Miller, P.A. (author), Melton, J.R. (author), Morino, I. (author), Muller, J. (author), Moruia-Flores, F. (author), Naik, V. (author), Niwa, Y. (author), Noce, S. (author), O'Doherty, S. (author), Parker, R.J. (author), Peng, C. (author), Preng, S. (author), Peters, G.P. (author), Prigent, C. (author), Prinn, R. (author), Ramonet, M. (author), Regnier, P. (author), Riley, W.J. (author), Rosentreter, J.A. (author), Segers, A.J. (author), Simpson, I.J. (author), Shi, H. (author), Smith, S.J. (author), Steele, L.P. (author), Thornton, B.F. (author), Tian, H. (author), Tohjima, Y. (author), Tubiello, F.N. (author), Tsuruta, A. (author), Viovy, N. (author), Voulgarakis, A. (author), Weber, T.S. (author), van Weele, M. (author), van der Werf, G.R. (author), Weiss, R.F. (author), Worthy, D. (author), Wunch, D. (author), Yin, Y. (author), Yoshida, Y. (author), Zhang, W. (author), Zhang, Z. (author), Zhao, Y. (author), Zheng, B. (author), Zhu, Q. (author), Zhu, Q. (author), Zhuang, Q. (author)Understanding and quantifying the global methane (CH4) budget is important for assessing realistic pathways to mitigate climate change. Atmospheric emissions and concentrations of CH4 continue to increase, making CH4 the second most important human-influenced greenhouse gas in terms of climate forcing, after carbon dioxide (CO2). The relative...article 2020
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Blechschmidt, A.M. (author), Arteta, J. (author), Coman, A. (author), Curier, L. (author), Eskes, H. (author), Foret, G. (author), Gielen, C. (author), Hendrick, F. (author), Parmentier, J. (author), Peters, E. (author), Pinardi, G. (author), Piters, A.J.M. (author), Plu, M. (author), Richter, A. (author), Segers, A.J. (author), Sofiev, M. (author), Valdebenito, A.M. (author), van Roozendael, M. (author), Vira, J. (author), Vlemmix, T. (author), Burrows, J.P. (author)Multi-axis differential optical absorption spectroscopy (MAX-DOAS) tropospheric NO2 column retrievals from four European measurement stations are compared to simulations from five regional air quality models which contribute to the European regional ensemble forecasts and reanalyses of the operational Copernicus Atmosphere Monitoring Service ...article 2020
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Jackson, R.B. (author), Saunois, M. (author), Bousquet, P. (author), Canadell, J.G. (author), Poulter, B. (author), Stavert, A.R. (author), Bergamaschi, P. (author), Niwa, Y. (author), Segers, A.J. (author), Tsuruta, A. (author)Climate stabilization remains elusive, with increased greenhouse gas concentrations already increasing global average surface temperatures 1.1 ◦C above pre-industrial levels (World Meteorological Organization 2019). Carbon dioxide (CO2) emissions from fossil fuel use, deforestation, and other anthropogenic sources reached ~ 43 billion metric...article 2020
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van der Graaf, S.C. (author), Kranenburg, R. (author), Segers, A.J. (author), Schaap, M. (author)The nitrogen cycle has been continuously disrupted by human activity over the past century, resulting in almost a tripling of the total reactive nitrogen fixation in Europe. Consequently, excessive amounts of reactive nitrogen (Nr) have manifested in the environment, leading to a cascade of adverse effects, such as acidification and eutrophication...article 2020
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