Środowiskowe Seminarium Fizyki Atmosfery
2006/2007 | 2007/2008 | 2008/2009 | 2009/2010 | 2010/2011 | 2011/2012 | 2012/2013 | 2013/2014 | 2014/2015 | 2015/2016 | 2016/2017 | 2017/2018 | 2018/2019 | 2019/2020 | 2020/2021 | 2021/2022 | 2022/2023 | 2023/2024 | 2024/2025 | Strona własna seminarium
2025-06-13 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15 
dr hab. Małgorzata Werner (Wydział Nauk o Ziemi i Kształtowania Środowiska, Uniwersytet Wrocławski)Anthropogenic and natural aerosols in the atmosphere - examples of practical applications of modelling and measurements
2025-04-11 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
dr Metin Muradoglu (Department of Mechanical Engineering, Koc University, Istanbul, Turkey)Interface-Resolved Simulation of Droplet Evaporation
Droplet evaporation in a convective environment plays a crucial role in many industrial and natural processes such as spray combustion, food processing, spread of respiratory diseases, and cloud formation.In this talk, I’ll present a high-fidelity hybrid sharp-interface immersed boundary/front-tracking method developed for interface-resolved direct numerical simulations of droplet evaporation and its application to droplet evaporation in convective environments. The droplet is fully deformable and the Clasius-Clapeyron equilibrium relation is used to determine the vapor mass fraction and subsequently the evaporation mass flux at the interface. The numerical method is very robust and second order accurate. Extensive simulations have been performed for a wide range of flow conditions relevant to spray combustion. Main finding is that the exiting evaporation models perform reasonably well on the leading edge of a nearly spherical droplet but yield qualitatively wrong evaporation flux on the back of the droplet i.e., after the separation point. Stefan flow thickens the boundary layer and results in an early separation, which further deteriorates performance of the exiting evaporation models. Droplet deformation also plays a critical role.
Short Bio:
Dr. Muradoglu is a professor of Mechanical Engineering at Koc University. He received his BS degree in Aeronautical Engineering from Istanbul Technical University (ITU) in 1992, and MS and PhD degrees both from Cornell University in 1997 and 2000, respectively. He also worked as a postdoc at Cornell for about 18 months before joining the Koc University faculty in 2001. He has had visiting positions at Harvard, Notre Dame, Princeton Universities (USA), Aalto University (Finland) and ENSAM (France), and the Max-Planck Institute for Intelligent Systems (Germany). Dr. Muradoglu’s work has been recognized by multiple awards including the Turkish Academy of Sciences outstanding young scientist award (2009) and the Scientific and Technological Research Council of Turkey (TUBITAK) encouragement award (2010). He is elected fellow of The American Society of Mechanical Engineers (ASME) (2023) and an elected member of Science Academy, Istanbul, Turkey.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/94912798396?pwd=VnqY8f5qufqoN0TubZaF1lea5hZxTc.1
Meeting ID: 949 1279 8396
Passcode: 479513
Short Bio:
Dr. Muradoglu is a professor of Mechanical Engineering at Koc University. He received his BS degree in Aeronautical Engineering from Istanbul Technical University (ITU) in 1992, and MS and PhD degrees both from Cornell University in 1997 and 2000, respectively. He also worked as a postdoc at Cornell for about 18 months before joining the Koc University faculty in 2001. He has had visiting positions at Harvard, Notre Dame, Princeton Universities (USA), Aalto University (Finland) and ENSAM (France), and the Max-Planck Institute for Intelligent Systems (Germany). Dr. Muradoglu’s work has been recognized by multiple awards including the Turkish Academy of Sciences outstanding young scientist award (2009) and the Scientific and Technological Research Council of Turkey (TUBITAK) encouragement award (2010). He is elected fellow of The American Society of Mechanical Engineers (ASME) (2023) and an elected member of Science Academy, Istanbul, Turkey.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/94912798396?pwd=VnqY8f5qufqoN0TubZaF1lea5hZxTc.1
Meeting ID: 949 1279 8396
Passcode: 479513
2025-04-04 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
mgr Izabela Wojciechowska (Faculty of Geography and Regional Studies, University of Warsaw and Space Research Centre, Polish Academy of Sciences)Cloud Types and Properties Variability Over Poland (2003–2021)
Clouds significantly affect Earth's energy balance by absorbing, reflecting, and transmitting short- and long-wave radiation. They can either intensify or weaken the greenhouse effect. The overall impact of cloudiness on radiating transfer depends on macro- and micro-physical properties of clouds (e.g., optical thickness, altitude, water content, cloud drop effective radius) and still remains one of the greatest uncertainties in global climate projections.
Recent studies based on traditional, synoptic (surface) data have shown several statistically significant trends in cloud types (genera) frequency over Poland. These changes included an increase in high and convective clouds frequency, along with a decrease in the frequency of Stratus, Altostratus, and Nimbostratus. As the ability to observe mid and high-level clouds from the ground is limited due to clouds overlapping, in this research, we aim to explore whether these trends can be confirmed by satellite records.
This work evaluates cloud types frequency and amount, as well as cloud properties over Poland in the last two decades. We use Moderate Resolution Imaging Spectroradiometer (MODIS) cloud properties (cloud top pressure, CTP; cloud optical thickness, COT; cloud effective radius, CER; and cloud water path, CWP) and surface (SYNOP) observations of cloud genera from the country's 27 ground-based stations for the period 2003–2021.
It was found that while for some cloud types (Cirrus, Altostratus + Nimbostratus, and Cumulus) MODIS and SYNOP show similar trends over the last two decades, for other cloud types (Cumulonimbus, Altocumulus, Stratocumulus) the two sources of data are not consistent. Hence, it was concluded that they should be treated as independent rather than complementary.
It was demonstrated that the increase in high-level clouds over Poland, which has been observed by other authors who based their research on synoptic data, is not caused by a decrease in low- and mid-level cloud frequency but is confirmed by satellite records.
The results of the study indicate that, over the past two decades, CTP over Poland has consistently decreased by 7.3–9.7 hPa per decade. This decline primarily affects northern and north-western Poland, with local decreases reaching up to −40.0 hPa per decade. High clouds (CTP < 440 hPa) exhibited the most pronounced changes, with a statistically significant negative trend observed over 25–35% of Poland's area. The research findings are particularly important for understanding the radiative properties of clouds and their role in atmospheric energy balance.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/93083252676?pwd=eIzs9s0hxPAqx0uNYfSVXrQxrvBTB9.1
Meeting ID: 930 8325 2676
Passcode: 214583
Recent studies based on traditional, synoptic (surface) data have shown several statistically significant trends in cloud types (genera) frequency over Poland. These changes included an increase in high and convective clouds frequency, along with a decrease in the frequency of Stratus, Altostratus, and Nimbostratus. As the ability to observe mid and high-level clouds from the ground is limited due to clouds overlapping, in this research, we aim to explore whether these trends can be confirmed by satellite records.
This work evaluates cloud types frequency and amount, as well as cloud properties over Poland in the last two decades. We use Moderate Resolution Imaging Spectroradiometer (MODIS) cloud properties (cloud top pressure, CTP; cloud optical thickness, COT; cloud effective radius, CER; and cloud water path, CWP) and surface (SYNOP) observations of cloud genera from the country's 27 ground-based stations for the period 2003–2021.
It was found that while for some cloud types (Cirrus, Altostratus + Nimbostratus, and Cumulus) MODIS and SYNOP show similar trends over the last two decades, for other cloud types (Cumulonimbus, Altocumulus, Stratocumulus) the two sources of data are not consistent. Hence, it was concluded that they should be treated as independent rather than complementary.
It was demonstrated that the increase in high-level clouds over Poland, which has been observed by other authors who based their research on synoptic data, is not caused by a decrease in low- and mid-level cloud frequency but is confirmed by satellite records.
The results of the study indicate that, over the past two decades, CTP over Poland has consistently decreased by 7.3–9.7 hPa per decade. This decline primarily affects northern and north-western Poland, with local decreases reaching up to −40.0 hPa per decade. High clouds (CTP < 440 hPa) exhibited the most pronounced changes, with a statistically significant negative trend observed over 25–35% of Poland's area. The research findings are particularly important for understanding the radiative properties of clouds and their role in atmospheric energy balance.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/93083252676?pwd=eIzs9s0hxPAqx0uNYfSVXrQxrvBTB9.1
Meeting ID: 930 8325 2676
Passcode: 214583
2025-03-21 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
mgr Robert Grosz (IGF UW)High-resolution temperature profiling in the LACIS-T wind tunnel and the Π Chamber
In this seminar, I will present a study on the small-scale temperature structure measured in two research facilities: the LACIS-T wind tunnel (TROPOS, Germany) and the Π Chamber (Michigan Tech, USA). The presentation will utilize both basic statistical tools and advanced spectral analysis to demonstrate how the scalar field evolves under different thermodynamic conditions.
The LACIS-T facility is one of the newest operational aerosol–cloud research chambers. As a closed-loop wind tunnel, it facilitates turbulent, isobaric mixing of two humidified, aerosol-free air streams under independently controlled and repeatable thermodynamic conditions. I will present results from two dry experiments conducted with temperature differences of 25 K and 16 K between the streams. These experiments reveal intensified scalar field variability across the mixing dimension, identify four distinct spectral regimes, and provide a comparative analysis between scalar and energy spectrum.
n contrast, the Π Chamber is a convection-cloud chamber that operates on the principle of induced Rayleigh-B.nard convection, where air is heated from below and cooled from above. This study examines temperature fluctuations under three different temperature differences between the bottom and the top (10 K, 15 K, and 20 K), corresponding to a Rayleigh number of approximately 109 and a Prandtl number of about 0.7. The analysis reveals significant variability in both standard deviation and skewness of temperature fluctuations near the top and bottom plates as well as in the central region—variations that were linked to local thermal plume dynamics. Additionally, three spectral regimes are identified, and a power-law relationship is established between the periodicity of the large-scale circulation and the temperature difference. Notably, the experimental results align well with Direct Numerical Simulations conducted under similar thermodynamic conditions.
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https://uw-edu-pl.zoom.us/j/91014685771?pwd=SVzn38CAlu4H1HgjTUNSnkVheZKhNj.1
Meeting ID: 910 1468 5771
Passcode: 255807
The LACIS-T facility is one of the newest operational aerosol–cloud research chambers. As a closed-loop wind tunnel, it facilitates turbulent, isobaric mixing of two humidified, aerosol-free air streams under independently controlled and repeatable thermodynamic conditions. I will present results from two dry experiments conducted with temperature differences of 25 K and 16 K between the streams. These experiments reveal intensified scalar field variability across the mixing dimension, identify four distinct spectral regimes, and provide a comparative analysis between scalar and energy spectrum.
n contrast, the Π Chamber is a convection-cloud chamber that operates on the principle of induced Rayleigh-B.nard convection, where air is heated from below and cooled from above. This study examines temperature fluctuations under three different temperature differences between the bottom and the top (10 K, 15 K, and 20 K), corresponding to a Rayleigh number of approximately 109 and a Prandtl number of about 0.7. The analysis reveals significant variability in both standard deviation and skewness of temperature fluctuations near the top and bottom plates as well as in the central region—variations that were linked to local thermal plume dynamics. Additionally, three spectral regimes are identified, and a power-law relationship is established between the periodicity of the large-scale circulation and the temperature difference. Notably, the experimental results align well with Direct Numerical Simulations conducted under similar thermodynamic conditions.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/91014685771?pwd=SVzn38CAlu4H1HgjTUNSnkVheZKhNj.1
Meeting ID: 910 1468 5771
Passcode: 255807
2025-01-17 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
mgr inż. Stanisław Król (IGF UW)Turbulent mixing in marine cumulus clouds - experimental data analysis
Due to the limited resolution in weather models, the effects associated with turbulence, especially turbulence that does not fully satisfy the assumptions of Kolmogorov theory, are not correctly represented in clouds. In addition, due to the need for more accurate parameterisations, it is useful to divide areas of the atmosphere into those with specific dynamic properties.
As part of this work, analyses of data gathered during EUREC4A campaign near Barbados in 2020 were carried out. Data consisted of three components of wind velocity, temperature and liquid water content. Analyses were carried in the context of turbulent mixing in clouds. First, a number of sections were selected to represent the different physical situations present in the atmosphere.
This was followed by analyses of the turbulence kinetic energy dissipation rate, the integral length scale and the Taylor microscale, as fundamental quantities characterising the turbulent flow. Additional analyses were carried out for the departure of turbulence from isotropy, by means of proportionality coefficient analysis, together with the use of the turbulence triangle method. Morover, analyses of nonequilibrium turbulence were performed, based on recent theoretical studies.
Next, in order to construct conditional statistics, a time-dependent recurrence quantification analysis was performed. One obtains a set of parameters which quantify a segment of a trajectory of an arbitrarily defined vector in the phase space. Here, a time-dependent version of the recurrence quantifiaction analysis was done in order to obtain time series of the parameters.
Finally, based on a selection of a critical value of one of the parameters, a method to distinguish segments was proposed. The division distinguished segments with different dynamical properties, and different properties of turbulence. The portions of the flight representing clouds and their surroundings had similar properties in terms of turbulence, as opposed to other regions.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/96848225134?pwd=bESXZaP7NU5xl6bMB4lHHalZz4pp9J.1
Meeting ID: 968 4822 5134
Passcode: 910088
As part of this work, analyses of data gathered during EUREC4A campaign near Barbados in 2020 were carried out. Data consisted of three components of wind velocity, temperature and liquid water content. Analyses were carried in the context of turbulent mixing in clouds. First, a number of sections were selected to represent the different physical situations present in the atmosphere.
This was followed by analyses of the turbulence kinetic energy dissipation rate, the integral length scale and the Taylor microscale, as fundamental quantities characterising the turbulent flow. Additional analyses were carried out for the departure of turbulence from isotropy, by means of proportionality coefficient analysis, together with the use of the turbulence triangle method. Morover, analyses of nonequilibrium turbulence were performed, based on recent theoretical studies.
Next, in order to construct conditional statistics, a time-dependent recurrence quantification analysis was performed. One obtains a set of parameters which quantify a segment of a trajectory of an arbitrarily defined vector in the phase space. Here, a time-dependent version of the recurrence quantifiaction analysis was done in order to obtain time series of the parameters.
Finally, based on a selection of a critical value of one of the parameters, a method to distinguish segments was proposed. The division distinguished segments with different dynamical properties, and different properties of turbulence. The portions of the flight representing clouds and their surroundings had similar properties in terms of turbulence, as opposed to other regions.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/96848225134?pwd=bESXZaP7NU5xl6bMB4lHHalZz4pp9J.1
Meeting ID: 968 4822 5134
Passcode: 910088
2025-01-10 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
ppłk mgr inż. Maciej Ostrowski (niezależny ekspert)Wpływ terenu na powstawanie wirów mezoskalowych, realne przykłady na podstawie wykonanych ekspertyz i opinii meteorologa
The impact of terrain on the formation of mesoscale vortices: real-life examples based on expert assessments and opinions from a meteorologist
Serdecznie zapraszamy na Środowiskowe Seminarium Fizyki Atmosfery pt. "Wpływ terenu na powstawanie wirów mezoskalowych, realne przykłady na podstawie wykonanych ekspertyz i opinii meteorologa".
Kiedy: 10 stycznia godz. 13:15,
Gdzie: sala B4.58
Link do spotkania via Google Meet: https://meet.google.com/vsy-hpfn-dkq
Przezentujący: ppłk mgr inż. Maciej Ostrowski
Opisano przypadki występowania i oddziaływania wirów mezoskalowych w kilku zróżnicowanych miejscach kraju:
Świecie, wiry przy krawędzi doliny Wisły;
Bezmiechowa w Bieszczadach, rotory w górach;
Rybnik, wiry po zawietrznej wzniesień pogórza;
Jastarnia, wiry propagujące po Zatoce Gdańskiej.
Każdy przypadek opisany jest z uwzględnieniem sytuacji synoptycznej, stratyfikacji atmosfery i zdjęcia satelitarnego czy radarowego. Zwraca się wagę na wykorzystanie danych z najbliższych stacji automatycznych.
W jednym przypadkach było możliwe na tej podstawie określenie wymiaru wiru.
Przykłady są częścią analiz lub opinii wykonywanych dla Komisji Badania Wypadków Lotniczych lub dla Sądów, przekazane zostaną uwagi metodologiczne do takiego rodzaju działań.
Kiedy: 10 stycznia godz. 13:15,
Gdzie: sala B4.58
Link do spotkania via Google Meet: https://meet.google.com/vsy-hpfn-dkq
Przezentujący: ppłk mgr inż. Maciej Ostrowski
Opisano przypadki występowania i oddziaływania wirów mezoskalowych w kilku zróżnicowanych miejscach kraju:
Świecie, wiry przy krawędzi doliny Wisły;
Bezmiechowa w Bieszczadach, rotory w górach;
Rybnik, wiry po zawietrznej wzniesień pogórza;
Jastarnia, wiry propagujące po Zatoce Gdańskiej.
Każdy przypadek opisany jest z uwzględnieniem sytuacji synoptycznej, stratyfikacji atmosfery i zdjęcia satelitarnego czy radarowego. Zwraca się wagę na wykorzystanie danych z najbliższych stacji automatycznych.
W jednym przypadkach było możliwe na tej podstawie określenie wymiaru wiru.
Przykłady są częścią analiz lub opinii wykonywanych dla Komisji Badania Wypadków Lotniczych lub dla Sądów, przekazane zostaną uwagi metodologiczne do takiego rodzaju działań.
We invite you to the Environmental Seminar on Atmospheric Physics titled: “The Impact of Terrain on the Formation of Mesoscale Vortices: Real-life Examples Based on Expert Assessments and a Meteorologist’s Opinions.”
When: January 10, 1:15 PM
Where: Room B4.58
Google Meet Link: https://meet.google.com/vsy-hpfn-dkq
Presenter: ppłk mgr inż. Maciej Ostrowski
The seminar will discuss cases of the occurrence and impact of mesoscale vortices in various locations across Poland:
• Świecie: vortices near the edge of the Vistula valley;
• Bezmiechowa in the Bieszczady Mountains: mountain rotors;
• Rybnik: leeward vortices of foothills;
• Jastarnia: vortices propagating over the Bay of Gdańsk.
Each case will be described with reference to synoptic conditions, atmospheric stratification, and satellite or radar imagery. Emphasis is placed on the use of data from nearby automatic weather stations.
In one case, the vortex dimensions were determined based on the data. These examples are part of analyses or opinions prepared for the State Commission for Aircraft Accident Investigation or Courts.
Methodological remarks for such activities will also be shared during the presentation.
2024-12-06 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
dr inż. Marta Wacławczyk (IGF UW)Scaling laws for turbulence in the atmospheric boundary layer
The presentation concerns similarity theories and scaling laws used to parametrize turbulence in ABL. The special focus will be on stably stratified boundary layers which forms mostly over night due to surface radiative cooling.
Weakly stably stratified boundary layers are described under the Monin-Obukhov similarity theory (MOST), in which the characteristic length scale is the Obukhov length L, constructed based on turbulent momentum and heat fluxes. However, as the stratification increases the Monin-Obukhov theory describes boundary layer less well. Our work focuses on similarity theories provided by invariant solutions of a set of governing equations forturbulence statistics. We present experimental verification of the derived formulas and show that they improve parametrization of the strongly stratified ABL.
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https://uw-edu-pl.zoom.us/j/98676440188?pwd=am0T9QrHHelsr6Xx0ace4pGIFVujXT.1
Meeting ID: 986 7644 0188
Passcode: 187760
Weakly stably stratified boundary layers are described under the Monin-Obukhov similarity theory (MOST), in which the characteristic length scale is the Obukhov length L, constructed based on turbulent momentum and heat fluxes. However, as the stratification increases the Monin-Obukhov theory describes boundary layer less well. Our work focuses on similarity theories provided by invariant solutions of a set of governing equations forturbulence statistics. We present experimental verification of the derived formulas and show that they improve parametrization of the strongly stratified ABL.
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/98676440188?pwd=am0T9QrHHelsr6Xx0ace4pGIFVujXT.1
Meeting ID: 986 7644 0188
Passcode: 187760
2024-11-29 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
dr Jakub Nowak (IGF UW)Climatology of low-level clouds in km-scale climate models
Low-level clouds over tropical oceans play an important role in regulating climate and shaping its response to changes because they reflect much of the incoming solar radiation. We explore how the two types of such clouds - stratocumulus and trade-wind cumulus - are represented by the two novel global km-scale coupled climate models developed within NextGEMS project: IFS and ICON. These models differ in their strategy to represent subgrid-scale processes, in particular turbulent mixing. IFS employs complex parameterizations inherited from its NWP ancestor, including eddy-diffusivity mass-flux and convection schemes. ICON adopts a simpler approach and applies a minimal set of paramaterizations, including the Smagorinsky-Lilly closure. The seminar will present the analysis of cloud albedo, its variability with environmental parameters and the vertical structure of the atmospheric boundary layer in eight regions: four corresponding four corresponding to canonical Atlantic and Pacific stratocumulus and four in their downstream trades.
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https://uw-edu-pl.zoom.us/j/99224976240?pwd=l1I6SLKvVq6IVEV6MV9MMxEt7tUfl5.1
Meeting ID: 992 2497 6240
Passcode: 325583
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/99224976240?pwd=l1I6SLKvVq6IVEV6MV9MMxEt7tUfl5.1
Meeting ID: 992 2497 6240
Passcode: 325583
2024-11-22 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
prof. dr hab. Wojciech W. Grabowski (NSF National Center for Atmospheric Research, Boulder, Colorado, USA)Broadening of cloud droplet spectra through eddy hopping: Getting it right
Droplet spectra observed in adiabatic and close-to-adiabatic volumes of convective clouds are typically significantly wider than those predicted by an adiabatic parcel rising from the cloud base, 1-2 microns versus a couple tenths of a micron. Presence of cloud turbulence and its impact on the diffusional growth of cloud droplets has been often used as a possible explanation. The idea is that droplets arriving at a given location follow different trajectories through a turbulent cloud and they feature different growth histories. This is what we refer to as the “eddy hoping”. This mechanism has been investigated over the last two decades applying theory as well as numerical simulations using idealized frameworks of stochastic models, DNS, and scaled-up DNS. These studies suggest that eddy hopping can explain large spectral width of the adiabatic droplet spectra. However, as I discussed in my lecture in May, all those computational studies feature a fundamental flaw of droplets dispersing in the vertical direction, with the large spectral width because of the correlation between droplet radius and its vertical position. In this lecture, I will discuss a new extremely-high-resolution (grid length of 7.5 m) numerical simulation of a turbulent cumulus cloud applying Lagrangian particle-based microphysics. The simulation indeed shows spectral width up to 1 micron in adiabatic volumes not far from the cloud base. To understand these results, I will discuss an idealized framework of a kinematic one-dimensional vertical air plume that crosses the cloud base and forms a cloud. Without turbulence, the results are consistent with the adiabatic parcel model: the spectral width above the cloud base is close to 0.1 micron. However, with turbulence, the kinematic model predicts spectral widths between 1 and 2 microns. Physical mechanisms involved will be discussed.
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https://uw-edu-pl.zoom.us/j/98509018301?pwd=62UlZxbSPGKGo4rPMaXGI5cOUUObG2.1
Meeting ID: 985 0901 8301
Passcode: 428031
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/98509018301?pwd=62UlZxbSPGKGo4rPMaXGI5cOUUObG2.1
Meeting ID: 985 0901 8301
Passcode: 428031
2024-11-15 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
dr Dominika Szczepanik (IGF UW)Air quality improvement during the winter season - city vs. suburban areas of the Warsaw metropolitan area
Starting in the 1990s, there has been a decline in emissions from the industrial sector, linked both to a reduction in production and to the filtering of emitted exhaust. Growing public awareness of the harmful effects of breathing polluted air, combined with tightening of air quality standards, should contribute to further reductions in emissions mainly from the municipal and transportation sectors. However, are we actually seeing improvements in air quality? Are there differences between pollutant concentrations in urban and suburban areas?
The seminar will focus on the results of the analysis of publicly available data on air quality from monitoring stations of the Chief Inspectorate of Environmental Protection in Warsaw and its surroundings. Air quality indices (PM, NOx, SOx, B(a)P) for seven measurement stations located in the city area (traffic station and urban background stations), as well as in suburban areas (one station in each geographic direction) will be discussed. The analysis considered the winter seasons (December-February) over the years of 2016-2023, with an analysis of meteorological conditions during the occurrences of bad and very bad air quality indices.
This work was partly done during the voluntary work of Dominika Szczepanik at Fire University and Karol Deptuła at the Institute of Geophysics.
The seminar will focus on the results of the analysis of publicly available data on air quality from monitoring stations of the Chief Inspectorate of Environmental Protection in Warsaw and its surroundings. Air quality indices (PM, NOx, SOx, B(a)P) for seven measurement stations located in the city area (traffic station and urban background stations), as well as in suburban areas (one station in each geographic direction) will be discussed. The analysis considered the winter seasons (December-February) over the years of 2016-2023, with an analysis of meteorological conditions during the occurrences of bad and very bad air quality indices.
This work was partly done during the voluntary work of Dominika Szczepanik at Fire University and Karol Deptuła at the Institute of Geophysics.
2024-11-08 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
dr inż. Piotr Dziekan (IGF UW)University of Warsaw Lagrangian Cloud Model (UWLCM): recent developments and future plans
UWLCM is a large-eddy simulation (LES) model of clouds developed at the University of Warsaw. I will present a brief overview of the model for those not familiar with it. Next, I will discuss recent developments of the model associated with our involvement in the NextGEMS project. These developments include a novel subgrid-scale (SGS) model based on fractal reconstruction of SGS fields, and the implementation of an anisotropic Smagorinsky turbulence model. I will present preliminary results from an ongoing study examining the sensitivity of stratocumulus clouds to the anisotropic SGS model, aimed at enhancing the representation of these clouds in global storm-resolving models, particularly at "grey-zone" resolutions with highly anisotropic grid cells. Finally, I will discuss future plans for incorporating ice microphysics and numerical improvements, including adaptations to new computing architectures and optimizations, as part of the HANAMI project.
You can also join online via Google Meet:
https://meet.google.com/xhs-tjsa-jir
You can also join online via Google Meet:
https://meet.google.com/xhs-tjsa-jir
2024-10-25 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
dr Konstantin Kuznetsov (GRASP Global - Space Services, Lille, France)Local scale Computational Fluid Dynamics modeling of aerosol transport over complex urban areas using CODE_SATURNE
Urban air pollution is a significant concern that affects the health andquality of life of city residents. The way pollutants spread through the air in cities is complicated by the intricate layout of buildings, streets, and other structures. In this seminar, we’ll dive into how we use Computational Fluid Dynamics (CFD) with code_saturne to model wind patterns and the movement of aerosols and other passive pollutants in cities like Paris and Warsaw.
We’ll share the details of our approach to building these high-resolution models (up to 1 meter resolution). This includes how we gather data about the city’s layout, create detailed meshes to represent complex urban geometries, and set up the right conditions for our simulations to run accurately. We’ll focus on how adding detailed features of the city into our models helps us better understand the subtle ways wind flows and pollutants move in densely built areas.
Additionally, we will present a comparative analysis between our simulation results and in-situ measurements from meteo stations. This comparison not only serves to validate our modeling approach but also highlights the effectiveness and limitations of CFD simulations in replicating real-world atmospheric conditions.
https://www.linkedin.com/in/kikuznetsov/edit/forms/next-action/after-connect-update-profile/
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https://uw-edu-pl.zoom.us/j/98630327949?pwd=dCnSGizv52gG8DiEC4iJZN6HRkL5WU.1
Meeting ID: 986 3032 7949
Passcode: 875971
We’ll share the details of our approach to building these high-resolution models (up to 1 meter resolution). This includes how we gather data about the city’s layout, create detailed meshes to represent complex urban geometries, and set up the right conditions for our simulations to run accurately. We’ll focus on how adding detailed features of the city into our models helps us better understand the subtle ways wind flows and pollutants move in densely built areas.
Additionally, we will present a comparative analysis between our simulation results and in-situ measurements from meteo stations. This comparison not only serves to validate our modeling approach but also highlights the effectiveness and limitations of CFD simulations in replicating real-world atmospheric conditions.
https://www.linkedin.com/in/kikuznetsov/edit/forms/next-action/after-connect-update-profile/
Join Zoom Meeting
https://uw-edu-pl.zoom.us/j/98630327949?pwd=dCnSGizv52gG8DiEC4iJZN6HRkL5WU.1
Meeting ID: 986 3032 7949
Passcode: 875971
2024-10-11 (Piątek)
Zapraszamy do sali B4.58, ul. Pasteura 5 o godzinie 13:15
dr inż. Jarosław Nęcki (Wydział Fizyki i Informatyki Stosowanej, Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)Estimation of methane emissions using mobile ground-based and airborne analysers
Methane is a potent greenhouse gas, and while it has a shorter atmospheric lifetime than CO₂, its near-term impact on climate change is particularly significant. This makes methane emissions a critical focus for climate change mitigation efforts. Addressing methane emissions from sectors such as waste management and fossil fuel extraction can yield immediate climate benefits, complementing long-term CO₂ reduction strategies.
Detecting methane is relatively straightforward from an analytical standpoint, but the wide range of concentrations can present technical challenges. Selecting the appropriate detection method is a key objective of current scientific research. During the presentation, I will discuss laser-based techniques for measuring methane concentrations across various matrices. I will compare their applications for both direct and indirect methods of emission estimation, with a particular focus on mobile techniques that enable remote verification of methane emissions. These mobile systems hold great potential for improving real-time monitoring and accuracy in emission assessments.
You can also join via Zoom Meeting
https://uw-edu-pl.zoom.us/j/96852587673?pwd=nmlirZeItkabZpGMBN41BeawHuDzxW.1
Meeting ID: 968 5258 7673
Passcode: 704745
Detecting methane is relatively straightforward from an analytical standpoint, but the wide range of concentrations can present technical challenges. Selecting the appropriate detection method is a key objective of current scientific research. During the presentation, I will discuss laser-based techniques for measuring methane concentrations across various matrices. I will compare their applications for both direct and indirect methods of emission estimation, with a particular focus on mobile techniques that enable remote verification of methane emissions. These mobile systems hold great potential for improving real-time monitoring and accuracy in emission assessments.
You can also join via Zoom Meeting
https://uw-edu-pl.zoom.us/j/96852587673?pwd=nmlirZeItkabZpGMBN41BeawHuDzxW.1
Meeting ID: 968 5258 7673
Passcode: 704745