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Accelerating volcanic ash data assimilation using a mask-state algorithm based on an ensemble Kalman filter: A case study with the LOTOS-EUROS model (version 1.10)

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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Evaluation and error apportionment of an ensemble of atmospheric chemistry transport modeling systems: Multivariable temporal and spatial breakdown

Solazzo, E. (author), Bianconi, R. (author), Hogrefe, C. (author), Curci, G. (author), Tuccella, P. (author), Alyuz, U. (author), Balzarini, A. (author), Baro, R. (author), Bellasio, R. (author), Bieser, J. (author), Brandt, J. (author), Christensen, J.H. (author), Colette, A. (author), Francis, X. (author), Fraser, A. (author), Garcia Vivanco, M. (author), Jiménez-Guerrero, P. (author), Im, U. (author), Manders-Groot, A.M.M. (author), Nopmongcol, U. (author), Kitwiroon, N. (author), Pirovano, G. (author), Pozzoli, L. (author), Prank, M. (author), Sokhi, R.S. (author), Unal, A. (author), Yarwood, G. (author), Galmarini, S. (author)

Through the comparison of several regional-scale chemistry transport modeling systems that simulate meteorology and air quality over the European and North American continents, this study aims at (i) apportioning error to the responsible processes using timescale analysis, (ii) helping to detect causes of model error, and (iii) identifying the...

article 2017

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Estimation of the Paris NOx emissions from mobile MAX-DOAS observations and CHIMERE model simulations during the MEGAPOLI campaign using the closed integral method

Shaiganfar, R. (author), Beirle, S. (author), Denier van der Gon, H. (author), Jonkers, S. (author), Kuenen, J. (author), Petetin, H. (author), Zhang, Q. (author), Beekmann, M. (author), Wagner, T. (author)

We determined NOx emissions from Paris in summer 2009 and winter 2009/2010 by applying the closed integral method (CIM) to a large set of car multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements performed within the framework of the MEGAPOLI project (http://megapoli.dmi.dk/). MAX-DOAS measurements of the tropospheric...

article 2017

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Multi-source SO2 emission retrievals and consistency of satellite and surface measurements with reported emissions

Fioletov, V. (author), McLinden, C.A. (author), Kharol, S.K. (author), Krotkov, N.A. (author), Li, C. (author), Joiner, J. (author), Moran, M.D. (author), Vet, R. (author), Visschedijk, A.J.H. (author), Denier Van Der Gon, H.A.C. (author)

Reported sulfur dioxide (SO2) emissions from US and Canadian sources have declined dramatically since the 1990s as a result of emission control measures. Observations from the Ozone Monitoring Instrument (OMI) on NASA's Aura satellite and ground-based in situ measurements are examined to verify whether the observed changes from SO2 abundance...

article 2017

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Multi-model ensemble simulations of olive pollen distribution in Europe in 2014: Current status and outlook

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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Validation of the CrIS fast physical NH3 retrieval with ground-based FTIR

Dammers, E. (author), Shephard, M.W. (author), Palm, M. (author), Cady-Pereira, K. (author), Capps, S. (author), Lutsch, E. (author), Strong, K. (author), Hannigan, J.W. (author), Ortega, I. (author), Toon, G.C. (author), Stremme, W. (author), Grutter, M. (author), Jones, N. (author), Smale, D. (author), Siemons, J. (author), Hrpcek, K. (author), Tremblay, D. (author), Schaap, M. (author), Notholt, J. (author), Willem Erisman, J. (author)

Presented here is the validation of the CrIS (Cross-track Infrared Sounder) fast physical NH3 retrieval (CFPR) column and profile measurements using ground-based Fourier transform infrared (FTIR) observations. We use the total columns and profiles from seven FTIR sites in the Network for the Detection of Atmospheric Composition Change (NDACC) to...

article 2017

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Data assimilation for volcanic ash plumes using a satellite observational operator: A case study on the 2010 Eyjafjallajökull volcanic eruption

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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Impact of spaceborne carbon monoxide observations from the S-5P platform on tropospheric composition analyses and forecasts

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, J.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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Report on ICDP workshop CONOSC (COring the NOrth Sea Cenozoic)

Westerhoff, W. (author), Donders, T. (author), Luthi, S. (author)

ICDP workshop COring the NOrth Sea Cenozoic focused on the scientific objectives and the technical aspects of drilling and sampling. Some 55 participants attended the meeting, ranging from climate scientists, drilling engineers, and geophysicists to stratigraphers and public outreach experts. Discussion on the proposed research sharpened the...

article 2016

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High-frequency monitoring of water fluxes and nutrient loads to assess the effects of controlled drainage on water storage and nutrient transport

Rozemeijer, J.C. (author), Visser, A. (author), Borren, W. (author), Winegram, M. (author), van der Velde, Y. (author), Klein, J. (author), Broers, H.P. (author)

High nitrogen (N) and phosphorus (P) fluxes from upstream agriculture threaten aquatic ecosystems in surface waters and estuaries, especially in areas characterized by high agricultural N and P inputs and densely drained catchments like the Netherlands. Controlled drainage has been recognized as an effective option to optimize soil moisture...

article 2016

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Aerosol source apportionment from 1-year measurements at the CESAR tower in Cabauw, the Netherlands

Schlag, P. (author), Kiendler-Scharr, A. (author), Johannes Blom, M. (author), Canonaco, F. (author), Sebastiaan Henzing, J. (author), Moerman, M. (author), Prévôt, A.S.H. (author), Holzinger, R. (author)

Intensive measurements of submicron aerosol particles and their chemical composition were performed with an Aerosol Chemical Speciation Monitor (ACSM) at the Cabauw Experimental Site for Atmospheric Research (CESAR) in Cabauw, the Netherlands, sampling at 5m height above ground. The campaign lasted nearly 1 year from July 2012 to June 2013 as...

article 2016

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Evaluation of the performance of four chemical transport models in predicting the aerosol chemical composition in Europe in 2005

Prank, M. (author), Sofiev, M. (author), Tsyro, S. (author), Hendriks, C. (author), Semeena, V. (author), Francis, X.V. (author), Butler, T. (author), van der Gon, H.D. (author), Friedrich, R. (author), Hendricks, J. (author), Kong, X. (author), Lawrence, M. (author), Righi, M. (author), Samaras, Z. (author), Sausen, R. (author), Kukkonen, J. (author), Sokhi, R. (author)

Four regional chemistry transport models were applied to simulate the concentration and composition of particulate matter (PM) in Europe for 2005 with horizontal resolution 20 km. The modelled concentrations were compared with the measurements of PM chemical composition by the European Monitoring and Evaluation Programme (EMEP) monitoring...

article 2016

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An evaluation of IASI-NH3 with ground-based Fourier transform infrared spectroscopy measurements

Dammers, E. (author), Palm, M. (author), van Damme, M. (author), Vigouroux, C. (author), Smale, D. (author), Conway, S. (author), Toon, G.C. (author), Jones, N. (author), Nussbaumer, E. (author), Warneke, T. (author), Petri, C. (author), Clarisse, L. (author), Clerbaux, C. (author), Hermans, C. (author), Lutsch, E. (author), Strong, K. (author), Hannigan, J.W. (author), Nakajima, H. (author), Morino, I. (author), Herrera, B. (author), Stremme, W. (author), Grutter, M. (author), Schaap, M. (author), Kruit, R.J.W. (author), Notholt, J. (author), Coheur, P.F. (author), Erisman, J.W. (author)

Global distributions of atmospheric ammonia (NH3) measured with satellite instruments such as the Infrared Atmospheric Sounding Interferometer (IASI) contain valuable information on NH3 concentrations and variability in regions not yet covered by ground-based instruments. Due to their large spatial coverage and (bi-)daily overpasses, the...

article 2016

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Evaluation of the boundary layer dynamics of the TM5 model over Europe

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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Sea salt emission, transport and influence on size-segregated nitrate simulation: A case study in northwestern Europe by WRF-Chem

Chen, Y. (author), Cheng, Y. (author), Ma, N. (author), Wolke, R. (author), Nordmann, S. (author), Schüttauf, S. (author), Ran, L. (author), Wehner, B. (author), Birmili, W. (author), van der Gon, H.A.C.D. (author), Mu, Q. (author), Barthel, S. (author), Spindler, G. (author), Stieger, B. (author), Müller, K. (author), Zheng, G.J. (author), Pöschl, U. (author), Su, H. (author), Wiedensohler, A. (author)

Sea salt aerosol (SSA) is one of the major components of primary aerosols and has significant impact on the formation of secondary inorganic particles mass on a global scale. In this study, the fully online coupled WRFChem model was utilized to evaluate the SSA emission scheme and its influence on the nitrate simulation in a case study in Europe...

article 2016

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Modeling and measurements of urban aerosol processes on the neighborhood scale in Rotterdam, Oslo and Helsinki

Karl, M. (author), Kukkonen, J. (author), Keuken, M.P. (author), Lützenkirchen, S. (author), Pirjola, L. (author), Hussein, T. (author)

This study evaluates the influence of aerosol processes on the particle number (PN) concentrations in three major European cities on the temporal scale of 1 h, i.e., on the neighborhood and city scales. We have used selected measured data of particle size distributions from previous campaigns in the cities of Helsinki, Oslo and Rotterdam. The...

article 2016

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Vertical profiling of aerosol hygroscopic properties in the planetary boundary layer during the PEGASOS campaigns

Rosati, B. (author), Gysel, M. (author), Rubach, F. (author), Mentel, T.F. (author), Goger, B. (author), Poulain, L. (author), Schlag, P. (author), Miettinen, P. (author), Pajunoja, A. (author), Virtanen, A. (author), Baltink, H.K. (author), Henzing, J.S. (author), Größ, J. (author), Gobbi, G.P. (author), Wiedensohler, A. (author), Kiendler-Scharr, A. (author), Decesari, S. (author), Facchini, M.C. (author), Weingartner, E. (author), Baltensperger, U. (author)

Vertical profiles of the aerosol particles hygroscopic properties, their mixing state as well as chemical composition were measured above northern Italy and the Netherlands. An aerosol mass spectrometer (AMS; for chemical composition) and a white-light humidified optical particle spectrometer (WHOPS; for hygroscopic growth) were deployed on a...

article 2016

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Insights into the deterministic skill of air quality ensembles from the analysis of AQMEII data

Kioutsioukis, I. (author), Im, U. (author), Solazzo, E. (author), Bianconi, R. (author), Badia, A. (author), Balzarini, A. (author), Baró, R. (author), Bellasio, R. (author), Brunner, D. (author), Chemel, C. (author), Curci, G. (author), van der Gon, H.D. (author), Flemming, J. (author), Forkel, R. (author), Giordano, L. (author), Jiménez-Guerrero, P. (author), Hirtl, M. (author), Jorba, O. (author), Manders-Groot, A. (author), Neal, L. (author), Pérez, J.L. (author), Pirovano, G. (author), San Jose, R. (author), Savage, N. (author), Schroder, W. (author), Sokhi, R.S. (author), Syrakov, D. (author), Tuccella, P. (author), Werhahn, J. (author), Wolke, R. (author), Hogrefe, C. (author), Galmarini, S. (author)

Simulations from chemical weather models are subject to uncertainties in the input data (e.g. emission inventory, initial and boundary conditions) as well as those intrinsic to the model (e.g. physical parameterization, chemical mechanism). Multi-model ensembles can improve the forecast skill, provided that certain mathematical conditions are...

article 2016

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Evaluation of the size segregation of elemental carbon (EC) emission in Europe: Influence on the simulation of EC long-range transportation

Chen, Y. (author), Cheng, Y.F. (author), Nordmann, S. (author), Birmili, W. (author), Denier Van Der Gon, H.A.C. (author), Ma, N. (author), Wolke, R. (author), Wehner, B. (author), Sun, J. (author), Spindler, G. (author), Mu, Q. (author), Pöschl, U. (author), Su, H. (author), Wiedensohler, A. (author)

Elemental Carbon (EC) has a significant impact on human health and climate change. In order to evaluate the size segregation of EC emission in the EUCAARI inventory and investigate its influence on the simulation of EC long-range transportation in Europe, we used the fully coupled online Weather Research and Forecasting/Chemistry model (WRF-Chem...

article 2016

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High-resolution monitoring of nutrients in groundwater and surface waters: Process understanding, quantification of loads and concentrations, and management applications

van Geer, F.C. (author), Kronvang, B. (author), Broers, H.P. (author)

Four sessions on "Monitoring Strategies: temporal trends in groundwater and surface water quality and quantity" at the EGU conferences in 2012, 2013, 2014, and 2015 and a special issue of <i>HESS</i> form the background for this overview of the current state of high-resolution monitoring of nutrients. The overview includes a summary of...

article 2016