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Your search keyword '"Syrakov, D."' showing total 116 results
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116 results on '"Syrakov, D."'

1. Assessment of the MACC reanalysis and its influence as chemical boundary conditions for regional air quality modeling in AQMEII-2

Author

Giordano, L., Brunner, D., Flemming, J., Hogrefe, C., Im, U., Bianconi, R., Badia, A., Balzarini, A., Baró, R., Chemel, C., Curci, G., Forkel, R., Jiménez-Guerrero, P., Hirtl, M., Hodzic, A., Honzak, L., Jorba, O., Knote, C., Kuenen, J.J.P., Makar, P.A., Manders-Groot, A., Neal, L., Pérez, J.L., Pirovano, G., Pouliot, G., San José, R., Savage, N., Schröder, W., Sokhi, R.S., Syrakov, D., Torian, A., Tuccella, P., Werhahn, J., Wolke, R., Yahya, K., Žabkar, R., Zhang, Y., and Galmarini, S.

Published
2015
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2. Uncertainties of simulated aerosol optical properties induced by assumptions on aerosol physical and chemical properties: An AQMEII-2 perspective

Author

Curci, G., Hogrefe, C., Bianconi, R., Im, U., Balzarini, A., Baró, R., Brunner, D., Forkel, R., Giordano, L., Hirtl, M., Honzak, L., Jiménez-Guerrero, P., Knote, C., Langer, M., Makar, P.A., Pirovano, G., Pérez, J.L., San José, R., Syrakov, D., Tuccella, P., Werhahn, J., Wolke, R., Žabkar, R., Zhang, J., and Galmarini, S.

Published
2015
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3. Model Simulation of Air Pollution Due to April 2010 Iceland Volcano Eruption

Author

Syrakov, D., Prodanova, M., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lirkov, Ivan, editor, Margenov, Svetozar, editor, and Waśniewski, Jerzy, editor

Published
2012
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4. Modeling of Toxic Substances in the Atmosphere – Risk Analysis and Emergency Forecast

Author

Brandiyska, A., Ganev, K., Syrakov, D., Prodanova, M., Miloshev, N., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lirkov, Ivan, editor, Margenov, Svetozar, editor, and Waśniewski, Jerzy, editor

Published
2012
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5. Climate Change Impact Assessment of Air Pollution Levels in Bulgaria

Author

Syrakov, D., Prodanova, M., Miloshev, N., Ganev, K., Jordanov, G., Spiridonov, V., Bogatchev, A., Katragkou, E., Melas, D., Poupkou, A., Markakis, K., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lirkov, Ivan, editor, Margenov, Svetozar, editor, and Waśniewski, Jerzy, editor

Published
2010
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6. Background Pollution Forecast over Bulgaria

Author

Syrakov, D., Ganev, K., Prodanova, M., Miloshev, N., Jordanov, G., Katragkou, E., Melas, D., Poupkou, A., Markakis, K., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lirkov, Ivan, editor, Margenov, Svetozar, editor, and Waśniewski, Jerzy, editor

Published
2010
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7. Numerical Study of Some High PM10 Levels Episodes

Author

Todorova, A., Gadzhev, G., Jordanov, G., Syrakov, D., Ganev, K., Miloshev, N., Prodanova, M., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lirkov, Ivan, editor, Margenov, Svetozar, editor, and Waśniewski, Jerzy, editor

Published
2010
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8. Joint Analysis of Regional Scale Transport and Transformation of Air Pollution from Road and Ship Transport

Author

Ganev, K., Syrakov, D., Gadzhev, G., Prodanova, M., Jordanov, G., Miloshev, N., Todorova, A., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lirkov, Ivan, editor, Margenov, Svetozar, editor, and Waśniewski, Jerzy, editor

Published
2010
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28. Background Pollution Forecast over Bulgaria

Author

Syrakov, D., primary, Ganev, K., additional, Prodanova, M., additional, Miloshev, N., additional, Jordanov, G., additional, Katragkou, E., additional, Melas, D., additional, Poupkou, A., additional, and Markakis, K., additional

Published
2010
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30. On some explicit advection schemes for dispersion modelling application

Author

Syrakov, D. and Galperin, M.

Subjects
Air quality management -- Methods, Air pollution control equipment -- Models, Air pollution control equipment -- Comparative analysis, Environmental services industry
Abstract

Byline: D. Syrakov, M. Galperin The advection scheme TRAP (Trapezium) was elaborated from the Bulgarian dispersion model EMAP (Eulerian Model for Air Pollution), which is a 3-D, PC-oriented multi-layer model. The TRAP scheme is of the Bott type; it is explicit, positively definite and conservative with limited numerical dispersion and good transportivity. Displaying the same properties as Bott's scheme, the TRAP scheme turns out to be faster. In the TRAP scheme, instead of Bott's method of integrating the polynomial fit over the neighbouring grid values, the flux area is supposed trapezoidal. The flux is determined as a product of the Courant number and a single value of the approximating polynomial referring to the middle of the passed distance. The same 4th order polynomial is used and Bott's normalisation is also applied. Some new and faster schemes built in the base of the TRAP and the Integrated Flux concepts are presented and tested here. The performance quality is determined exploiting the rotational test; instantaneous point-shaped and cone-shaped sources are rotated in a 101 X 101 grid point field. A set of criteria is used reflecting suitable characteristics of the advection algorithm. Additional demonstration tests are made over the scheme found to be the best of the set.

Published
2003

31. Simulation of air pollution in the cross-border region Bulgaria -Turkey

Author

Syrakov, D., Prodanova, M., Nikolov, V., Oruc, I., Emilia Georgieva, and Slavov, K.

Subjects
Cross-border region, Air quality assessment, Model evaluation
Abstract

16th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2014 -- 8 September 2014 through 11 September 2014 -- 112323 The Bulgarian Chemical Weather Forecast System, based on WRF-CMAQ models is applied with 9km resolution for air pollution simulations in the cross-border region Bulgaria-Turkey, known for its natural parks with rich biodiversity and tourism activities in summer. Model results are compared to observations from 5 surface stations focussing on PM10, O3, NO2 and SO2 in February and June 2014. The preliminary analysis based on evaluation of some main statistics (mean, correlation, temporal variation) reveals that the model system performs well for ozone in summer, while PM10 and NO2 concentrations are underestimated. The result indicate some of the air quality problems of the region - high ozone in summer, high SO2 values in parts of the Turkish territory in winter and high PM10 daily mean concentrations in winter. © Crown Copyright 2014 Dstl.

Published
2014

36. Intercomparison study of atmospheric mercury models: 1. Comparison of models with short-term measurements

Author

Ryaboshapko, A., Bullock Jr., O. R., Christensen, J., Cohen, M., Dastoor, A., Ilyin, I., Petersen, G., Syrakov, D., Artz, R. S., Davignon, D., Draxler, R. R., and Munthe, J.

Subjects
Atmospheric concentrations, Atmospheric transport, Numerical modelling, Mercury species, Model intercomparison
Abstract

Five regional scale models with a horizontal domain covering the European continent and its surrounding seas, one hemispheric and one global scale model participated in an atmospheric mercury modelling intercomparison study. Model-predicted concentrations in ambient air were compared against mercury species observed at four monitoring stations in Central and Northern Europe and a station on the Irish west coast. The modelled concentrations of total particulate mercury (TPM) were generally consistent with the measurements at all sites. The models exhibited significant ability to simulate concentrations of gaseous elemental mercury (GEM), but some of the short-duration peaks at the Central European stations could not be consistently reproduced. Possible reasons for these discrepancies include (1) errors in the anthropogenic emissions inventory utilized; (2) coarse spatial resolution of the models; and (3) uncertainty of natural and re-emitted mercury sources. The largest discrepancies between measurements and modelled concentrations were found for reactive gaseous mercury (RGM). For these models, the uncertainty in predicting short-term (two-week episode) variations of mercury species in air can be characterized by the following overall statistics: 90% of the results for TGM are within a factor of 1.35 of the measurements; for TPM, 90% are within a factor of 2.5; and for RGM, 90% are within a factor of 10.

Published
2007

40. Study of the pollution exchange between Bulgaria and northern Greece

Author

Zerefos, C. Syrakov, D. Ganev, K. Vasaras, A. Kourtidis, K. Tzortziou, M. Prodanova, M. Dimitrova, R. Georgieva, E. Yordanov, D. Miloshev, N.

Abstract

The present work aims at a detailed study and explanation of the pollution transport in the air basin over south-western Bulgaria and northern Greece and assessment of the air pollution exchange between Bulgaria and Greece. Some well-known specific climatic air pollution effects were studied and explained. Calculations were made of the SO2 pollution of the Balkan Peninsula from both Greek and Bulgarian sources for 1995, and the country-to-country pollution budget diagrams were built. Days with extreme mean concentration for Bulgaria and northern Greece were picked out, and some further specification of the contribution of the different sources in both the countries to these cases of extreme pollution was made. Some preliminary studies of possible mesoscale effects on the pollution exchange between Bulgaria and northern Greece were carried out. A three-layer pollution transport model with a more complex chemistry block was introduced, and some preliminary simulations of the transport of sulfur and nitrogen compounds were performed.

Published
2004

42. Renewable Energy Potential in Bulgaria - Some Computer Simulations Results.

Author

Ganev, K., Jordanov, G., Gadzhev, G., Miloshev, N., Syrakov, D., and Prodanova, M.

Subjects
RENEWABLE energy sources, COMPUTER simulation, STATISTICAL significance, GRID computing
Abstract

The paper presents a work, which aims at numerical study of the wind and solar energy potential of the country. The wind/solar energy fields simulations were performed applying the 5th generation PSU/NCAR Meso- Meteorological Model MM5 for years 2000-2007 with a spatial resolution of 3 km over Bulgaria. The computer simulated data base is large and rather comprehensive. In this sense it can be considered as statistically significant ensemble. This allows statistical treatment in order various wind and solar energy potential evaluations to be retrieved from the data base. Some evaluations of the country wind and solar energy potential, based on the simulation output are demonstrated in the paper. [ABSTRACT FROM AUTHOR]

Published
2014
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49. Exploiting GRID for Model Estimates of Regional Climate Changes and Its Impact on the Air Quality of Bulgaria

Author

Syrakov, D., primary, Spiridonov, V., additional, Ganev, K., additional, Prodanova, M., additional, Bogatchev, A., additional, Miloshev, N., additional, Slavov, K., additional, Katragkou, E., additional, Melas, D., additional, Poupkou, A., additional, Markakis, K., additional, Todorov, Michail D., additional, and Christov, Christo I., additional

Published
2010
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50. Operational pollution forecast for the region of Bulgaria.

Author

Syrakov, D., Etropolska, I., Prodanova, M., Ganev, K., Miloshev, N., and Slavov, K.

Subjects
*WEATHER forecasting, *PROTOTYPES, *POLLUTION, *NUMERICAL analysis, *BOUNDARY value problems
Abstract

An operational prototype of the Integrated Bulgarian Chemical Weather Forecasting and Information System is presented. This version of the system is limited to relatively low resolution (10 km) but covers all Bulgaria. It is based on the US EPA Models-3 System (MM5, SMOKE and CMAQ). The meteorological input to the system is the Bulgarian operational numerical weather forecast. The boundary conditions are taken from analogous Greek system (Aristotle University of Thessaloniki). Bulgarian system runs automatically twice a day (00 and 12 UTC) and produces 48-hour forecast. The part of the results of each System's run is post-processed in a way to be visualized and uploaded to a respective web site. In the paper, description of the System is given together with a demonstration of its products. In addition highlights of Systems upgrade will be given. [ABSTRACT FROM AUTHOR]

Published
2012
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