Article
Meteorology & Atmospheric Sciences
Sheide Chammas, Qing Wang, Tapio Schneider, Matthias Ihme, Yi-fan Chen, John Anderson
Summary: This study demonstrates the use of tensor processing units (TPUs) to simulate low clouds, providing valuable insights into their role in climate. The simulations conducted using TPUs show unprecedented speed and scalability, allowing for the generation of large datasets for training climate models.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Mechanics
A. Golsa Tabe Jamaat, B. Yuji Hattori
Summary: In this study, a neural network is implemented to establish the relationship between the resolved-scale flow field and the subgrid-scale stress for the Burgers equation. The training datasets are obtained by filtering the direct numerical simulation results and different sets of input parameters are considered. The a priori and a posteriori tests show that the neural network models have high correlation coefficients with the filtered DNS data and can produce stable results without any stabilization techniques.
Article
Meteorology & Atmospheric Sciences
Matthew C. Wyant, Christopher S. Bretherton, Robert Wood, Peter N. Blossey, Isabel L. McCoy
Summary: A new Aitken mode aerosol microphysics scheme is developed to investigate cloud-aerosol interactions in the marine boundary layer and test the Aitken buffering hypothesis. The scheme includes seven prognostic variables and treatment of scavenging and coagulation processes. Testing with a deep stratocumulus case shows that the presence of the Aitken mode aerosol increases cloud droplet concentration and delays the formation of an ultraclean, strongly precipitating cumulus state.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Engineering, Multidisciplinary
Yasasya Batugedara, Alexander E. Labovsky, Kyle J. Schwiebert
Summary: A new family of turbulence models, LES-C, has been proposed, which reduces modeling error by treating an LES model as a defect solution and then correcting it on the same spatial mesh. In numerical tests, all LES-C models outperform their LES counterparts.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Meteorology & Atmospheric Sciences
Ehsan Erfani, Peter Blossey, Robert Wood, Johannes Mohrmann, Sarah J. Doherty, Matthew Wyant, O. Kuan-Ting
Summary: This study investigates the stratocumulus to cumulus transitions (SCTs) and their sensitivity to aerosols using a large-eddy simulation (LES) model. The results show that changes in aerosols have an impact on the transition process, and precipitation plays a key role in the sensitivity.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Mechanics
T. Nilsson, S. Zhong, C. Fureby
Summary: In this study, large eddy simulation (LES) of supersonic flow, mixing, self-ignition, and combustion in a supersonic hydrogen jet in a crossflow configuration is reported. The LES model used is based on filtered mass, momentum, species, and energy equations and an explicit flow solver. Effects of jet-to-crossflow momentum ratio, chemical reaction mechanism, and subgrid combustion model are investigated by comparing predictions with experimental data, showing good agreement but with some departures for certain reaction mechanisms and LES combustion models. The LES results are also used to elucidate flow, mixing, and combustion features of this configuration.
Article
Engineering, Multidisciplinary
Yasasya Batugedara, Alexander E. Labovsky, Kyle J. Schwiebert
Summary: The new LES-C turbulence model reduces modeling error and time discretization error by using defect correction and deferred correction techniques, demonstrating increased accuracy without significant added computational cost through numerical analysis and computational tests.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Energy & Fuels
Guoqiang Xiong, Gesheng Li, Weilin Zeng, Junjie Liang
Summary: The steady flamelet method was used in the large eddy simulation (LES) of turbulent cool flames to investigate its capability. The results showed that it accurately captured the mean and variance trends for temperature, mixture fraction, and formaldehyde, as well as described the flame morphology of the two-stream flamelet form.
Article
Mechanics
Xiao Xue, Hua-Dong Yao, Lars Davidson
Summary: This paper presents a synthetic turbulence generator (STG) for the interface of Reynolds averaged Navier-Stokes (RANS) equations and lattice Boltzmann method (LBM) large eddy simulation (LES). The STG method generates velocity fluctuations and reconstructs particle distribution functions at the interface. The results from a turbulent channel flow simulation using the STG method are quantitatively compared with other simulations and show good agreement. This method shows potential for aerodynamics simulations and engineering applications.
Article
Thermodynamics
Xiangji Guo, Bo Zhang, Yong Shan
Summary: In this study, a large eddy simulation model (LES) was used to analyze large-scale precessing vortices and energy separation in a Ranque-Hilsch vortex tube. It was found that the tube contains vortex structures of secondary circulation flow and precessing vortices, which can drive part of the reverse flow towards the main flow by overcoming adverse radial pressure gradients. Through processes such as vortex shedding, energy transfer was achieved from the inner layer to the outer layer in a heat pump cycle driven by vortex core precession.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Meteorology & Atmospheric Sciences
Fan Yang, Fabian Hoffmann, Raymond A. Shaw, Mikhail Ovchinnikov, Andrew M. Vogelmann
Summary: Recent observations have found haze particles in a convection cloud chamber. The existing microphysics schemes for simulating the cloud chamber cannot fully capture the haze particles and their associated processes. This study develops and adapts microphysics schemes that can properly resolve the activation and deactivation processes of haze particles.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Meteorology & Atmospheric Sciences
Ali Khosronejad, Ajay B. B. Limaye, Zexia Zhang, Seokkoo Kang, Xiaolei Yang, Fotis Sotiropoulos
Summary: The interaction between flow, sediment transport, and bed topography plays a crucial role in the formation of bedforms and channel migration in meandering rivers. Predicting these interactions is vital for river engineering and geoscience research. Researchers conducted simulations to study the morphodynamics and bed deformation in 42 meandering rivers with different planform shapes. The simulations revealed the formation of scour and deposition patterns near the outer and inner banks and the variation of point bars and scour regions around the meander bends.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Engineering, Aerospace
Tao Tang, Hongbo Wang, Mingbo Sun, Guoyan Zhao, Jiangfei Yu, Zhouqin Fan, Zhenguo Wang
Summary: The Flamelet/Progress Variables (FPV) model coupled with large eddy simulation (LES) is applied to simulate supersonic hydrogen combustion in strut based scramjet and cavity based combustors. The results show that the FPV model with LES accurately captures the structure and characteristics of the supersonic combustion flow field. The importance of calculating sub-grid turbulent scalar flux for calculating mixture fraction variance is emphasized.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Paul E. Bieringer, Aaron J. Pina, David M. Lorenzetti, Harmen J. J. Jonker, Michael D. Sohn, Andrew J. Annunzio, Richard N. Fry
Summary: Recent advancements in LES atmospheric models have enabled simulations of short-term pollutant dispersion at high spatial and temporal resolutions for various atmospheric dispersion needs. The JOULES model, incorporating GPU-based LES, is capable of resolving turbulence components for both open terrain and urban landscapes, providing faster and more efficient contaminant dispersion simulations.
Article
Oceanography
Haili Wang, Changming Dong, Baylor Fox-Kemper, Qing Li, Yongzeng Yang, Xu Chen, Kenny T. C. Lim Kam Sian
Summary: The ocean surface boundary layer is crucial for the exchange of momentum, energy, and gases between the atmosphere and the ocean. Ocean surface waves induce mixing, which affects these exchanges. A new parameterization scheme with wave-induced mixing is developed and verified against observational data, showing improved accuracy in simulating surface temperature and mixed layer depth compared to previous schemes.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Meteorology & Atmospheric Sciences
Shuaiqi Tang, Shaocheng Xie, Zhun Guo, Song-You Hong, Boualem Khouider, Daniel Klocke, Martin Kohler, Myung-Seo Koo, Phani Murali Krishna, Vincent E. Larson, Sungsu Park, Paul A. Vaillancourt, Yi-Chi Wang, Jing Yang, Chimene L. Daleu, Cameron R. Homeyer, Todd R. Jones, Neelam Malap, Roel Neggers, Thara Prabhakaran, Enver Ramirez, Courtney Schumacher, Cheng Tao, Peter Bechtold, Hsi-Yen Ma, J. David Neelin, Xubin Zeng
Summary: General Circulation Models (GCMs) have difficulty in accurately modeling the diurnal cycle of precipitation, particularly in representing the interactions between convection and environmental conditions. Unified convection schemes improve the simulation of precipitation onset time, while the performance of models in capturing deep convection influences accuracy. Detecting elevated convection is crucial for simulating nocturnal precipitation, highlighting the importance of model capability in this aspect.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2022)
Article
Meteorology & Atmospheric Sciences
Bart Geerts, Scott E. Giangrande, Greg M. McFarquhar, Lulin Xue, Steven J. Abel, Jennifer M. Comstock, Susanne Crewell, Paul J. DeMott, Kerstin Ebell, Paul Field, Thomas C. J. Hill, Alexis Hunzinger, Michael P. Jensen, Karen L. Johnson, Timothy W. Juliano, Pavlos Kollias, Branko Kosovic, Christian Lackner, Ed Luke, Christof Luepkes, Alyssa A. Matthews, Roel Neggers, Mikhail Ovchinnikov, Heath Powers, Matthew D. Shupe, Thomas Spengler, Benjamin E. Swanson, Michael Tjernstroem, Adam K. Theisen, Nathan A. Wales, Yonggang Wang, Manfred Wendisch, Peng Wu
Summary: COMBLE aimed to study the cloud regime of cold-air outbreaks over high-latitude oceans, providing a rich dataset and observations for improving the representation of cloud processes in models.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2022)
Article
Meteorology & Atmospheric Sciences
Larissa S. Nazarenko, Nick Tausnev, Gary L. Russell, David Rind, Ron L. Miller, Gavin A. Schmidt, Susanne E. Bauer, Maxwell Kelley, Reto Ruedy, Andrew S. Ackerman, Igor Aleinov, Michael Bauer, Rainer Bleck, Vittorio Canuto, Gregory Cesana, Ye Cheng, Thomas L. Clune, Ben I. Cook, Carlos A. Cruz, Anthony D. Del Genio, Gregory S. Elsaesser, Greg Faluvegi, Nancy Y. Kiang, Daehyun Kim, Andrew A. Lacis, Anthony Leboissetier, Allegra N. LeGrande, Ken K. Lo, John Marshall, Elaine E. Matthews, Sonali McDermid, Keren Mezuman, Lee T. Murray, Valdar Oinas, Clara Orbe, Carlos Perez Garcia-Pando, Jan P. Perlwitz, Michael J. Puma, Anastasia Romanou, Drew T. Shindell, Shan Sun, Kostas Tsigaridis, George Tselioudis, Ensheng Weng, Jingbo Wu, Mao-Sung Yao
Summary: This paper presents the response of the GISS-E2.1 climate models to anthropogenic forcing in the 21st century Shared Socioeconomic Pathways emission scenarios. The study finds that global mean warming ranges from 1.5 degrees C to 5.2 degrees C by the year 2100, depending on the emission scenario. Changes in surface air temperature, precipitation, sea ice area, and Atlantic overturning stream function are also observed.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Meteorology & Atmospheric Sciences
Philipp J. Griewank, Thijs Heus, Roel A. J. Neggers
Summary: This paper presents a unique methodology for studying shallow continental convection, using a segmentation algorithm to identify individual 3D objects and analyzing their properties. The results show that the width of the objects significantly affects their kinematic and thermodynamic properties, especially above cloud base.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Meteorology & Atmospheric Sciences
Gabriele Arduini, Sarah Keeley, Jonathan J. Day, Irina Sandu, Lorenzo Zampieri, Gianpaolo Balsamo
Summary: Correctly representing the snow on sea-ice is crucial for improving cryosphere-atmosphere coupling and enhancing weather forecasting and monitoring applications. Different approaches to simulate snow on sea-ice have shown to improve the representation of temperature variability, reduce surface temperature biases, and enhance the simulation of temperature inversions.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Meteorology & Atmospheric Sciences
Sonja Gisinger, Inna Polichtchouk, Andreas Doernbrack, Robert Reichert, Bernd Kaifler, Natalie Kaifler, Markus Rapp, Irina Sandu
Summary: This study evaluates temperature and gravity wave activity in ECMWF Integrated Forecasting System (IFS) over Rio Grande using long-term high-resolution temperature data from Compact Rayleigh Autonomous Lidar (CORAL). The results show that seasonal and altitudinal variations play an important role in explaining the temperature differences between IFS and lidar, and the gravity wave activity in the middle atmosphere is a major driver of seasonal variability.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Meteorology & Atmospheric Sciences
M. Wendisch, M. Brueckner, S. Crewell, A. Ehrlich, J. Notholt, C. Luepkes, A. Macke, J. P. Burrows, A. Rinke, J. Quaas, M. Maturilli, V. Schemann, M. D. Shupe, E. F. Akansu, C. Barrientos-Velasco, K. Baerfuss, A-M Blechschmidt, K. Block, I. Bougoudis, H. Bozem, C. Boeckmann, A. Bracher, H. Bresson, L. Bretschneider, M. Buschmann, D. G. Chechin, J. Chylik, S. Dahlke, H. Deneke, K. Dethloff, T. Donth, W. Dorn, R. Dupuy, K. Ebell, U. Egerer, R. Engelmann, O. Eppers, R. Gerdes, R. Gierens, I. V. Gorodetskaya, M. Gottschalk, H. Griesche, V. M. Gryanik, D. Handorf, B. Harm-Altstaedter, J. Hartmann, M. Hartmann, B. Heinold, A. Herber, H. Herrmann, G. Heygster, I. Hoeschel, Z. Hofmann, J. Hoelemann, A. Huenerbein, S. Jafariserajehlou, E. Jaekel, C. Jacobi, M. Janout, F. Jansen, O. Jourdan, Z. Juranyi, H. Kalesse-Los, T. Kanzow, R. Kaethner, L. L. Kliesch, M. Klingebiel, E. M. Knudsen, T. Kovacs, W. Koertke, D. Krampe, J. Kretzschmar, D. Kreyling, B. Kulla, D. Kunkel, A. Lampert, M. Lauer, L. Lelli, A. von Lerber, O. Linke, U. Loehnert, M. Lonardi, S. N. Losa, M. Losch, M. Maahn, M. Mech, L. Mei, S. Mertes, E. Metzner, D. Mewes, J. Michaelis, G. Mioche, M. Moser, K. Nakoudi, R. Neggers, R. Neuber, T. Nomokonova, J. Oelker, I. Papakonstantinou-Presvelou, F. Paetzold, V. Pefanis, C. Pohl, M. van Pinxteren, A. Radovan, M. Rhein, M. Rex, A. Richter, N. Risse, C. Ritter, P. Rostosky, V. V. Rozanov, E. Ruiz Donoso, P. Saavedra Garfias, M. Salzmann, J. Schacht, M. Schaefer, J. Schneider, N. Schnierstein, P. Seifert, S. Seo, H. Siebert, M. A. Soppa, G. Spreen, I. S. Stachlewska, J. Stapf, F. Stratmann, I. Tegen, C. Viceto, C. Voigt, M. Vountas, A. Walbroel, M. Walter, B. Wehner, H. Wex, S. Willmes, M. Zanatta, S. Zeppenfeld
Summary: The (AC)(3) project, established in 2016, collected a wealth of data on the physical, chemical, and meteorological properties of the Arctic atmosphere, cryosphere, and upper ocean. Short-term changes and long-term trends in Arctic climate parameters have been identified, such as increased atmospheric moistening, regional storm activities, winter warming in specific regions, and decreasing sea ice thickness and snow depth on sea ice. The project also made advancements in atmospheric-ocean and radiative transfer models, and discovered local marine/biogenic sources for cloud condensation nuclei and ice nucleating particles. Cross-cutting activities are being developed to further synthesize the results and answer key questions.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2023)
Article
Meteorology & Atmospheric Sciences
Marina Duetsch, Eric J. Steig, Peter N. Blossey, Andrew G. Pauling
Summary: High-resolution simulations indicate that the collapse of the West Antarctic Ice Sheet would cause detectable isotopic changes at several locations, providing constraints on the past collapse. Elevated 818O levels at SkyTrain Ice Rise and elevated deuterium excess and 818O levels at Hercules Dome are the most significant signals.
JOURNAL OF CLIMATE
(2023)
Editorial Material
Meteorology & Atmospheric Sciences
Thomas Jung, Francois Massonnet, Irina Sandu
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2023)
Article
Meteorology & Atmospheric Sciences
Camille Risi, Caroline Muller, Francoise Vimeux, Peter Blossey, Gregoire Vedeau, Clarisse Dufaux, Sophie Abramian
Summary: This study aims to understand the isotopic mesoscale variations in organized convective systems such as tropical cyclones or squall lines, with a focus on isotopic signals in near-surface vapor and precipitation. Cloud resolving model simulations are used to mimic these systems and investigate the drivers of isotopic depletion within them. The results show that rain evaporation and rain-vapor diffusive exchanges play a significant role in shaping the isotopic patterns in tropical cyclones and squall lines.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2023)
Article
Environmental Sciences
Jan Chylik, Dmitry Chechin, Regis Dupuy, Birte S. Kulla, Christof Luepkes, Stephan Mertes, Mario Mech, Roel A. J. Neggers
Summary: This study simulates the springtime Arctic mixed-phase convection over open water in the Fram Strait using large-eddy simulation (LES) model, and evaluates the model's ability to reproduce the observed convection. It is found that aerosol modulates the turbulent mixing and cloud transformation, as well as the thermal structure, lapse rate, and energy budget of the low-level air mass. The study also suggests that initializing the model with in situ aerosol data provides the best agreement with the observed cloud and turbulence, emphasizing the importance of measuring aerosol concentration during field campaigns for high-resolution modeling efforts.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Je-Yun Chun, Robert Wood, Peter Blossey, Sarah J. Doherty
Summary: Ship tracks in subtropical marine low clouds are simulated and investigated using large-eddy simulations. The key findings are that aerosol injections increase cloud-top entrainment rate, drying and warming are offset by corresponding responses in surface fluxes, precipitation, and radiation, turbulence intensification affects cloud macrophysics, and clouds were brightened in all cases.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Nils Wedi, Peter Bauer, Irina Sandu, Joern Hoffmann, Sophia Sheridan, Rafael Cereceda, Tiago Quintino, Daniel Thiemert, Thomas Geenen
Summary: "Destination Earth" is an important initiative to develop and deploy digital twins of the Earth system. The European Commission is investing in this new type of information system that combines the physical and digital worlds, to support decision making in the face of extreme weather and climate change and allow users to interact, modify, and create their own tailored information.
COMPUTING IN SCIENCE & ENGINEERING
(2022)
Article
Environmental Sciences
Michael S. Diamond, Pablo E. Saide, Paquita Zuidema, Andrew S. Ackerman, Sarah J. Doherty, Ann M. Fridlind, Hamish Gordon, Calvin Howes, Jan Kazil, Takanobu Yamaguchi, Jianhao Zhang, Graham Feingold, Robert Wood
Summary: Smoke from southern Africa affects the transition between stratocumulus and cumulus clouds, producing aerosol radiative effects that are crucial for understanding cloud evolution.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Israel Silber, Robert C. Jackson, Ann M. Fridlind, Andrew S. Ackerman, Scott Collis, Johannes Verlinde, Jiachen Ding
Summary: Climate models play a crucial role in understanding Earth's atmosphere, and the ground-based lidar and radar instrument simulator EMC2 facilitates direct comparison of model outputs with observations, providing a lightweight and flexible framework.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)