Seminari e corsi

Manifestazioni in ambito meteorologico

Convezione atmosferica, temporali e grandine: nu

Weather and Climate Seminar: Annalisa Bracco

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Martedì 3 maggio alle ore 15.30 si terrà via Zoom il sesto seminario della serie “Weather and Climate: From Fundamentals to Applications”. Maggiori informazioni sull’iniziativa, così come il modulo di pre-registrazione Zoom ed il programma completo possono essere trovati a questo link. Il seminario, dal titolo Exploring the Manifold of the Tropical Pacific in Observations andModels, sarà ospitato dall’Università di Trento e tenuto da Annalisa Bracco (Earth and Atmospheric Sciences, Georgia Institute of Technology). Abstract: The climate system is multiscale, multidimensional and nonlinear. Here we propose a robust framework for visualizing and analyzing its dynamics, accounting for both dependencies and nonlinearities. At each time t, the system is uniquely described by a state space vector parameterized by N variables and their spatial variability. The dynamics is confined on a manifold with dimension lower than the full state space and a strategy for manifold learning is presented via linear and nonlinear algorithms. We focus on the Tropical Pacific Ocean using a reanalysis as observational proxy (ERA5) and two state-of-the-art models from the CMIP6 catalog, MPI and EC-Earth3. The analysis spans four variables over two 40 years periods at daily frequency, during historical times and in the SSP585 scenario. The manifold learning step allows for comparing nonlinear contributions as well as the relative role of each variable in the system’s dynamics. Instantaneous properties of the high dimensional attractor are then quantified through the local dimension and persistence metrics, recently introduced to the climate community. These metrics quantify geometrical properties of the manifold and the stability of local motions. Both models underestimate the average dimension and overestimate the potential predictability of Tropical Pacific climate compared to ERA5, which is indicative of common and persistent differences between modelled and observed dynamics. These model’s biases are nearly identical during the historical period while diverging in the global warming scenario analyzed.

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Weather and Climate Seminar: David Thompson

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Martedì 26 aprile alle ore 15.30 si terrà via Zoom il quinto seminario della serie “Weather and Climate: From Fundamentals to Applications”. Maggiori informazioni sull’iniziativa, il modulo di pre-registrazione Zoom, ed il programma completo a questo link. Il seminario di martedì prossimo, dal titolo Understanding the Processes that Drive Surface Temperature Variability, sarà ospitato dall’Università di Trento e tenuto da David Thompson (Colorado State University, University of East Anglia). Abstract: In this talk I will provide highlights of two different – but overlapping – research topics. Both relate to the processes that drive surface temperature variability. In the first part I will focus on the role of ocean dynamics in driving sea-surface temperature variability. The key conclusion is that ocean dynamics act – in the net – to damp rather than drive low-frequency SST variability. The upshot is that the observed decadal variability – such as that associated with Atlantic decadal variability and the Pacific Decadal Oscillation – can not be traced to ocean processes. In the second part I will focus on changes in temperature persistence under climate change. Here the key finding is that temperature persistence is certain to change across the globe, but that the signs of the changes depend critically on various physical processes. I will argue that one key but overlooked process is the changes in radiative damping timescales under climate change.

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Environmental Meteorology Seminar

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Università di Trento Per la serie Environmental Meteorology Seminar segnaliamo il seminario di Valerio Lembo (ISAC-CNR) dal titolo “Atmospheric meridional energy transports and the mid-latitudinal eddy-driven general circulation” organizzato dall’Università di Trento per giovedì 21 aprile 2022 alle 14:30. Il seminario, principalmente dedicato agli studenti del corso di Laurea Magistrale in Enviromental Meteorology, si terrà presso presso la Lecture Room 1P – DICAM Via Mesiano, 77 – Trento. Sarà possibile seguire l’evento online via zoom al link https://unitn.zoom.us/j/83219936705Meeting ID: 811 4936 3705Passcode: 533412 Atmospheric meridional energy transports and the mid-latitudinaleddy-driven general circulation Abstract Meridional energy transports are the primary consequence of the excess of radiative heat in the Tropics as opposed to the deficit in the polar regions. The atmospheric general circulation acts by balancing this contrast, on average transporting energy towards the Poles, and transforming the available potential energy determined by diabetic heating into kinetic energy and ultimately into frictional heating. In the mid-latitudes, the atmospheric circulation is featured by turbulent eddies at a wider range of temporal and spatial scales, and the meridional energy transport is associated with the development of baroclinic instability. Just like the weather systems, meridional energy transports in mid-latitudes occur in an intermittent and sporadic way, with a small number of extreme events carrying a huge amount of the overall energy transported across latitudes within a season. Here, meridional energy transports in NH mid-latitudes are investigated, as they are described in the ERA5 Reanalysis exercise, emphasizing the role of eddies at different zonal wavenumbers, and focusing on their role in characterizing transport extremes during wintry and summery seasons. We will see that the emergence of extremely strong transports is promoted by specific characteristic weather regimes, especially those related to co-located blocking patterns mediated by planetary-scale waves. Furthermore, we will see that planetary-scale waves occasionally contrast the baroclinic conversion of available potential into kinetic energy when the transport is extremely weak, eventually featuring a counter-gradient transport from the Poles towards the Equator. In a case study of extremely strong and persistent meridional energy transport during summer, we will also evidence the typicality of such extreme events, and the fact that they are consistent with the development of widespread heat waves across the Northern Hemisphere. Valerio Lembo Institute for Atmospheric Science and ClimateNational Research Council (ISAC-CNR) BioValerio is a researcher at the CNR Institute for Atmospheric Science andClimate in Bologna. He is interested in various aspects of climatedynamics, mainly those affected by and affecting energy budgets andtransports, and the interaction between heat and momentum. He developsmethods to diagnose the thermodynamics and the general circulation ofthe atmosphere, as a way to contribute bringing the basic principles ofphysics into the climate modeling debate. He uses methods fromstatistical mechanics and dynamical systems theory to explore theresponse of the climate system to external forcings, the role ofinternal variability and long-term predictability. Before joining ISACin 2020, he was a postdoc at the University of Hamburg. He received hisPhD in Ecology and Climate Change in 2016 from the  University ofSalento, Lecce.

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EUMETSAT – International Summer School 2022

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L’Aeronautica Militare in collaborazione con l’European Organisation for theExploitation of Meteorological Satellites (EUMETSAT), organizza la prossima estatel’“International Summer School on Applications with Newest Multi-spectralEnvironmental Satellites” In tale contesto, è aperta la selezione dei frequentatori riservata a studenti eprofessionisti nell’ambito della meteorologia operativa. Il numero di posti assegnatoall’Italia è limitato a cinque, eventualmente elevabili qualora tutte le posizioniriservate ai frequentatori di altre nazionalità non fossero ricoperte. Il corso, in lingua inglese, si terrà a Bracciano (Roma) dal 20 giugno al 29 giugno 2022, secondoun’agenda che sarà resa nota non appena disponibile. Ai partecipanti è chiesto ilpossesso di una laurea triennale o magistrale in una delle seguenti discipline:Matematica, Fisica, Meteorologia, Astronomia, Scienze Nautiche, Scienze Ambientalio equivalenti. Per partecipare al corso i candidati devono inviare lettera dipresentazione del proprio responsabile di ricerca, o professore di riferimento,allegando il proprio curriculum vitae a Stato Maggiore Aeronautica, Ufficio GeneraleAviazione Militare e Meteorologia, ai seguenti indirizzi e-mail:francesco.denile@aeronautica.difesa.it e paolo.capizzi@aeronautica.difesa.it, entro il 12 aprile 2022. I candidati saranno selezionati sulla base del proprio CV. Non è previsto alcun rimborso di spese da parte degli Enti organizzatori. I candidati selezionati riceveranno una comunicazione via e-mail per il perfezionamento dell’iscrizione, con registrazione al seguente link entro il 19 Aprile 2022.

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Environmental Meteorology Seminar

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Per la serie “Environmental Meteorology Seminar” segnaliamo il seminario di David G. Lerach dal titolo “Tornadoes and Supercell Thunderstorms: Applications in Mesoscale Meteorology” organizzato dall’Università di Trento giovedì 7 aprile 2022 alle 14:30. Il seminario, principalmente dedicato agli studenti del corso di Laurea Magistrale in Enviromental Meteorology, si terrà presso presso la Lecture Room 1P – DICAM Via Mesiano, 77 – Trento. Sarà possibile seguire l’evento online via zoom al link https://unitn.zoom.us/j/83219936315Meeting ID: 832 1993 6315Passcode: 279903 Tornadoes and Supercell Thunderstorms: Applications in MesoscaleMeteorology AbstractThe supercell thunderstorm is one of the most powerful, violent, anddestructive forces seen in nature, capable of producing severe flashflooding, strong surface winds, cloud-to-ground lightning, large hail,and tornadoes. Most supercell tornadoes occur in the central U.S., butthey can be observed on every continent except Antarctica. However, fewsupercells produce tornadoes and predicting tornadogenesis andsubsequent vortex life cycle remains a significant challenge. In thisseminar, we will discuss the environmental setup and basic mesoscaledynamics that drive supercell formation, structure, evolution, andtornadogenesis. These dynamics will be put in context with importantobservations and concepts that have resulted from field campaigns suchas the Verification of the Origins of Rotation in Tornadoes EXperiment(VORTEX) and VORTEX2, as well as very high-resolution model simulations. BioAssociate Professor of Meteorology, University of Northern ColoradoDepartment of Earth and Atmospheric Sciences, 501 20 th St., Greeley, CO80639Email: david.lerach@unco.eduProfessional PreparationSt. Cloud State University St. Cloud, MN Meteorology B.S., 2004Colorado State University Fort Collins, CO Atmospheric Science M.S.,2006Colorado State University Fort Collins, CO Atmospheric Science Ph.D.,2012AppointmentsAssociate Professor of Meteorology, Department of Earth &Atmospheric Sciences, University of Northern Colorado, 2018 – presentAssistant Professor of Meteorology, Department of Earth &Atmospheric Sciences, University of Northern Colorado, 2013 – 2018Visiting Assistant Professor of Meteorology, Department of EarthSciences, The College at Brockport, 2012 – 2013Graduate Research Assistant, Colorado State University, 2004 – 2012Area of Specialization and Research Interests: Aerosols and cloudmicrophysics, mesoscale meteorology, and numerical modeling applicationsincluding severe thunderstorms and orographic snowfall.

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EUMETCAL – High Impact Weather Webinars

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EUMETCAL ha annunciato che si terranno nei giorni 11 aprile e 2 maggio due webinar dal titolo “High Impact Weather”. I webinar seguono il corso HIW offerto da EUMETCAL nel 2021. L’obbiettivo di questo corso è quello di fornire un supporto ai previsori nella previsione delle convezioni profonde estive attraverso l’ausilio dell’IBM (Doswell’s ingredient-based forecasting method). L’evento è aperto principalmente ai meteorologi che operano nei servizi meteorologici nazionali o nei centri meteorologici in Europa. Ci si aspetta che i partecipanti abbiano già un’esperienza di base nella previsione delle convezioni estive. Per maggiori informazioni e per registrarsi all’evento basta visitare il seguente link.

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CNR ISAC Summer School 2022

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Segnaliamo l’organizzazione dell’8° CNR ISAC Summer School con tema: “Atmospheric Composition and Meteorology”. La scuola è organizzata in collaborazione con l’Università Politecnica delle Marche e avrà luogo all’Hotel Orsa Maggiore, a Castro Marina (vicino a Lecce) dal 20 al 24 Giugno 2022. La scuola è pensata per dottorandi, post-doc e meteorologi operativi di agenzie regionali e nazionali. Maggiori informazioni sono disponibili a questo link.

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Environmental Meteorology Seminar

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Per la serie “Environmental Meteorology Seminar” segnaliamo il seminario di Franco Molteni dal titolo “Simulations of climate variability with a model of intermediate complexity” organizzato dall’Università di Trento giovedì 31 marzo 2022 alle 14:00. Il seminario, principalmente dedicato agli studenti della Laurea Magistrale in Environmental Meteorology si terrà solo in modalità online. Gli interessati potranno partecipare via Zoom al link https://unitn.zoom.us/j/85470205697Meeting ID: 854 7020 5697Passcode: 966830 Simulations of climate variability with a model of intermediate complexity Abstract: Progress in the development of global climate models (GCMs) has allowed the simulation of many aspects of atmospheric and climate variability with an increasing level of fidelity. However, state-of-the-art GCMs are highly complex numerical codes which require substantial computational resources, as well as a deep understanding of the code organization by scientists who intend to modify their formulation in order to perform sensitivity studies. In academic environments, models with a simplified formulation and much lower computational demands allow researchers to perform numerical experiments which can be easily planned and executed. This talk presents the formulation of the intermediate-complexity global model developed at the International Centre for Theoretical Physics (ICTP) in Trieste, and shows a selection of results from studies on seasonal to decadal variability performed with this model. It is shown that, despite the reduced complexity, the ICTP model can successfully address a number of topics at the forefront of research on climate dynamics. Bio: Franco Molteni obtained a degree in Physics from the University of Milan and a Ph.D. in Atmospheric Physics from the Imperial College of the University of London. He has been a co-leader of the Earth System Physics section at the International Centre for Theoretical Physics (ICTP) in Trieste, and Head of the Seasonal Forecast and Ensemble Prediction sections at the European Centre for Medium-range Weather Forecasts (ECMWF) in Reading, U.K. His main areas of expertise are climate variability on sub-seasonal to decadal scales, ensemble predictions, and regime behaviour in non-linear dynamical models of the atmosphere. He is currently a scientific consultant at ECMWF and ICTP, and visiting professor in Atmospheric, Oceanic and Planetary Physics at the University of Oxford.

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Weather and Climate Seminar: Francesca Di Giuseppe

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Martedì 29 marzo alle ore 15.30 si terrà via Zoom il terzo seminario della serie “Weather and Climate: From Fundamentals to Applications”. Maggiori informazioni sull’iniziativa, il modulo di pre-registrazione Zoom, ed il programma completo a questo link. Il seminario di giovedì prossimo, dal titolo How Good are We at Predicting Fires?, sarà ospitato dall’Università dell’Aquila e tenuto da Francesca di Giuseppe (ECMWF). Abstract: The prediction of fire danger conditions allows fire management agencies to implement fire prevention, detection and pre-suppression action plans before fire damages occur. However, in many countries fire danger rating relies on observed weather data, which only allows for daily environmental monitoring of fire conditions. Even when this estimation is enhanced with the combined use of satellite data, such as hot spots for early fire detection and land cover and fuel conditions, it normally only provides 4 to 6 h warnings. By using forecast conditions from advanced numerical weather models, early warning could be extended by up to 1–2 weeks, allowing for greater coordination of resource-sharing and mobilization within and across countries. Using 1 year of pre-operational service in 2017 and the Fire Weather Index (FWI), in this talk we assess the capability of the system to predict fire danger globally and analyse in detail three major events in Chile, Portugal and California. The analysis shows that the skill provided by an ensemble forecast system extends to more than 10 days when compared to the use of mean climate, making a case for extending the forecast range to the sub-seasonal to seasonal timescale. However, accurate FWI prediction does not translate into accuracy in the forecast of fire activity globally. Indeed, when all fires detected in 2017 are considered, including agricultural- and human-induced burning, high FWI values only occur in 50 % of the cases and are limited to the Boreal regions. Nevertheless, for very large events which were driven by weather conditions, FWI forecasts provide advance warning that could be instrumental in setting up management and containment strategies.

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