Środowiskowe Seminarium Fizyki Atmosfery
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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