24-131 Infrasound Observation and Modeling Using
Il y a 2 mois
Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Meteorological Atmosphere
**Mission**:
Contribution of stratospheric balloon measurements to the detection of infrasound from explosive sources, and to the modeling of mesoscale atmospheric dynamics and its impact on infrasound propagation
In the frame of the Stratéole-2 project (ST2), superpressure balloon (SPB) flights were conducted to study the dynamics and chemistry of the tropical upper troposphere-lower stratosphere (UTLS) region. The tropical UTLS supports a wealth of atmospheric wave motions, from large-scale equatorial waves to mesoscale gravity waves (1-1000 km). Drifting with the wind, SPBs provide a complete description of atmospheric inertia-gravity waves (e.g. Corcos et al, 2021) and constitute an invaluable dataset for model evaluation (e.g. Podglajen et al., 2020).
In 2021, for the first time, the ST2 balloon payload also included pressure sensors sampling at 1 Hz, in the infrasound frequency range. While limited balloon-borne infrasound measurements had been performed in the past (e.g., Bowman and Krishnamoorthy, 2021), ST2 provided the first stratospheric balloon record of a major geophysical event, the violent eruption of the Hunga-Tonga (HT) undersea volcano on January 15, 2022. Compared to ground stations, balloon sensors demonstrated superior detection capabilities, benefiting both from being located in an upper stratospheric acoustic waveguide, and from reduced exposure to acoustic noise generated by ground turbulence (Podglajen, et al., 2022). So far, analyses have been restricted to the January 15 case, which was exceptional in terms of energy release and altitude of the plume.
The goals of the present thesis project are to (1) assess the ability of high-resolution balloon infrasound measurements to detect and characterize infrasound from explosive sources of various magnitudes, and to (2) evaluate the representation of mesoscale atmospheric dynamics in high-resolution models, as well as its impact on infrasound propagation and detection.
On the first aspect, we intend to precisely document the advantages of upper-air infrasound measurements and their complementarity with ground-based observations to characterize explosive sources of infrasound. Less intense events than the January 15 HT blast were recorded by ST2 balloons at a range of distances from the source, in particular during the 2021-2022 HT eruptive sequence. Detailed data analyses of the different events and infrasound propagation simulations will be used to assess the detection capabilities and information content of upper-air infrasound observations.
The second part of the project will focus on evaluating mesoscale atmospheric dynamics in a global storm-resolving model, and its impact on infrasound propagation and signal interpretation. It is well recognized that mesoscale dynamics has a large influence on the propagation of infrasound (e.g., Kulichkov et al., 2008). To date, this effect has mostly been taken into account stochastically. However, the development of high-resolution (km) global models in recent years is associated with the new ability to explicitly resolve mesoscale dynamics. Simulations will be run with the German weather service high-top (>100 km) UA-ICON (Upper atmosphere icosahedral non-hydrostatic model) model (Giorgetta et al., 2018), recently implemented at CEA. ST2 balloon-borne observations will be used to evaluate the representation of mesoscale atmospheric dynamics, following a methodology previously applied to reanalysis. This will enable us to quantify resolved and unresolved wave variability, to estimate the impact on infrasound propagation and the associated uncertainty.
The PhD project will be co-supervised by Alexis Le Pichon (CEA-DAM, PhD advisor) and Aurélien Podglajen (LMD, PhD co-advisor). The collaboration between the two host institutions is formalized in the frame of the Laboratoire de Recherche Commun (LRC) Yves Rocard.
=================
**Profil**:
**Laboratoire**:
LMD
**MESSAGE from Phd Team**:
-
24-097 Integration of Thermal Imaging and Radar for
Il y a 2 mois
Palaiseau, France CNES - Centre National d'Etudes Spatiales Temps pleinDoctorat, 36 mois - Temps plein - Aucune expérience exigée - Maitrise, IEP, IUP, Bac+4 - Digital technologies for remote sensing **Mission**: This doctoral project is part of the Onera "MUSIC" research chair, led by Elise Colin, which focuses on developing innovative image processing and AI techniques for unconventional data. It explores the...
-
24-336 Tracking Anthropogenic Co2 with Space-based
il y a 4 semaines
Palaiseau, France CNES - Centre National d'Etudes Spatiales Temps pleinDoctorat, 36 mois - Temps plein - Aucune expérience exigée - Maitrise, IEP, IUP, Bac+4 - Atmospheric Composition & Climate **Mission**: Tracking anthropogenic emissions of the two main greenhouse gases (GHGs) influenced by human activities, carbon dioxide (CO2) and methane (CH4), is crucial to assessing progress towards the objectives of the Paris...
-
24-229 Differential Absorption Lidar for Water
Il y a 2 mois
Palaiseau, France CNES - Centre National d'Etudes Spatiales Temps pleinDoctorat, 36 mois - Temps plein - Aucune expérience exigée - Maitrise, IEP, IUP, Bac+4 - Meteorological Atmosphere **Mission**: The ONERA Laser Sources and Metrology (SLM) research unit is involved in the development of original Differential Absorption Lidar (DiAL) systems for greenhouse gases concentration measurement in the atmosphere, with the use of...
-
23-207 Pdoc - Two-temperature Atomization Modeling
il y a 1 semaine
Palaiseau, France CNES - Centre National d'Etudes Spatiales Temps pleinPost-doctorat, 24 mois - Temps plein - Moins de 2 ans d’expérience - Doctorat, Bac+8 - Propulsion **Mission**: == The choice of liquid methane as propellant for the design of new rocket engines brings some new difficulties compared to hydrogen/oxygen engines. One of them is operating conditions involving methane and oxygen both injected liquid through...
-
Developping an IDE for writing pattern-based and formal requirements
il y a 2 semaines
Palaiseau, Île-de-France Cea Temps pleinThe objective of this project is to develop an interactive editor and associated library for safety requirement patterns. This requires study of (1) existing requirement patterns and related work [1], (2) the vocabulary and safety-related concepts defined in safety standards, e.g. ISO26262 [2]. Then the safety-related concepts should be mapped to the...
-
Palaiseau, Île-de-France Cea Temps pleinThe objective of this project is to develop an interactive editor and associated library for safety requirement patterns. This requires study of (1) existing requirement patterns and related work [1], (2) the vocabulary and safety-related concepts defined in safety standards, e.g. ISO26262 [2]. Then the safety-related concepts should be mapped to the...
-
24-246 Radar Super-resolution By Deep Learning:
Il y a 2 mois
Palaiseau, France CNES - Centre National d'Etudes Spatiales Temps pleinDoctorat, 36 mois - Temps plein - Aucune expérience exigée - Maitrise, IEP, IUP, Bac+4 - Digital technologies for remote sensing **Mission**: This doctoral project is part of the Onera "MUSIC" research chair, led by Elise Colin, which focuses on developing innovative image processing and AI techniques for unconventional data. Establishing connections...
-
Palaiseau, France INRIA Temps pleinContexte et atouts du poste With the advent of consumption and dissemination of information online, it becomes important to verify factual information available.In particular, public figures, like politicians and elected officials, make public statements that have far-reaching implications. Thus, the task of fact checking becomes critical in order to...
-
Grid Coloring for Object Sensing and Localization
Il y a 2 mois
Palaiseau, France INRIA Temps pleinContexte et atouts du poste Within the framework of a partnership with Nokia Bell Labs. Starting time: Position available immediately (duration 6 months). Mission confiée Internship Supervisors: Cedric Adjih, Research Scientist Department/Lab: INRIA, TRiBE team, Saclay, France Contact: Chung Shue (Calvin) Chen, Research...
-
Grid Coloring for Object Sensing and Localization
il y a 2 semaines
Palaiseau, France INRIA Temps pleinContexte et atouts du poste Within the framework of a partnership with Nokia Bell Labs. Starting time: Position available immediately (duration 6 months). Mission confiée Internship Supervisors: Cedric Adjih, Research Scientist Department/Lab: INRIA, TRiBE team, Saclay, France Contact: Chung Shue (Calvin) Chen, Research...
-
24-251 High Power Agile Laser Source for Coherent
Il y a 2 mois
Palaiseau, France CNES - Centre National d'Etudes Spatiales Temps pleinDoctorat, 36 mois - Temps plein - Aucune expérience exigée - Maitrise, IEP, IUP, Bac+4 - Instrumentation **Mission**: Wind lidars measure wind speed projected on the laser axis and resolved in distance. It uses the Doppler effect which applies a frequency shift to photons which are backscattered on particles/molecules carried by the wind. It is made up of...
-
Internship: Fabrication and Optimization of Quantum
il y a 2 semaines
Palaiseau, France Quandela Temps pleinQuandela is a spin-off company from the French national laboratory CNRS founded in 2017. The company brings together teams of quantum technology specialists with broad experience in semiconductor nanotechnologies, quantum optics, computer science, and quantum information processing. Our core product consists of ultra-bright sources of single-photons based...
-
Palaiseau, France INRIA Temps pleinContexte et atouts du poste The ANR FITNESS project, part of the PEPR Network of the Future, funds this Ph.D. program. Mission confiée Context Intelligent Transport System is open to new applications and services (e.g., infotainment, video streaming, etc.) leveraging vehicle and consumer interaction opportunities. Among such opportunities is...
-
Palaiseau, France INRIA Temps pleinContexte et atouts du poste The ANR FITNESS project, part of the PEPR Network of the Future, funds this Ph.D. program. Mission confiée Context Intelligent Transport System is open to new applications and services (e.g., infotainment, video streaming, etc.) leveraging vehicle and consumer interaction opportunities. Among such opportunities is...
-
PALAISEAU, France CEA Temps pleinWe are looking for a highly skilled and motivated Research Engineer to join our team to develop cutting-edge technology in the field of Electronic Design Automation (EDA).In the context of a national project, you will BE responsible for developing a simulation environment for chiplet-based SoC architecture, using AI-driven methodologies to improve existing...
-
Stage - Degradation Analysis On Perovskite Solar
Il y a 2 mois
Palaiseau, France TotalEnergies Temps plein**Pays** France **Lieu de travail** STOP & WORK LE PLAYGROUND-Palaiseau(FRA) **Domaine** Recherche Innovation&Développt **Lieu** 91 - Essonne **Durée du contrat** 6 Mois **Expérience** Moins de 3 ans Actuellement **étudiant(e)** **en école d'ingénieurs en bac + 5/6** **, **vous recherchez un *** **stage conventionné** **d'une durée de** **6...
-
Alternance - Quality Corporate Culture and
il y a 1 semaine
Palaiseau, France Danone Temps pleinAbout the job More than 91% of our interns and apprentices recommend completing their internship, apprenticeship or VIE at Danone (Happy Trainees source). And what if YOU are our next apprentice? **JOINING DANONE : IT’S...** To meet Danoners with singular personalities and diverse career paths; Grow within different environments: production and logistic...
-
Postdoctoral Researcher
il y a 1 semaine
Palaiseau, France ONERA Temps plein**Title : Data analysis on aluminum combustion in a solid-propellant flame** **Keywords** Rocket propulsion, solid propulsion, aluminum, combustion modeling, CFD, data analysis, laser diagnostics, laser-induced fluorescence imaging **Profile and skills required** A PhD degree in fluid dynamics and combustion or an associated field Knowledge in numerical...
-
Internship: Fabrication and optimization of quantum light sources
il y a 2 semaines
Palaiseau, France Quandela Temps pleinQuandela is a spin-off company from the French national laboratory CNRS founded in 2017. The company brings together teams of quantum technology specialists with broad experience in semiconductor nanotechnologies, quantum optics, computer science, and quantum information processing.Located in the southern suburbs of Paris, with its main offices in Massy and...
-
Internship: Fabrication and optimization of quantum light sources
il y a 2 semaines
Palaiseau, France Quandela Temps pleinQuandela is a spin-off company from the French national laboratory CNRS founded in 2017. The company brings together teams of quantum technology specialists with broad experience in semiconductor nanotechnologies, quantum optics, computer science, and quantum information processing.Located in the southern suburbs of Paris, with its main offices in Massy and...
