tag:www.mi.uni-hamburg.de,2005:/en/institut/newsarchivNews2024-03-04T14:04:36ZNAGR-fakmin-37196927-production2024-02-28T23:00:00ZAtmospheric waves article featured in Eos Editors' Highlight<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/37196902/temperature-anomalies-733x414-b0b27ec6b1572cc04157960e74aa1f1fbf4f9413.jpg" /><p>The article "One-minute resolution GOES-R observations of Lamb and gravity waves triggered by the Hunga Tonga-Hunga Ha'apai eruptions on 15 January 2022" by Ákos Horváth et al. was featured in an "Editors' Highlight" on the Eos website. Editors’ Highlights present a select few of the most interesting recent papers by AGU’s journal editors.</p><p>Photo: Horváth et al.</p>NAGR-fakmin-37116189-production2024-02-22T23:00:00ZApply now for Atmospheric Science<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/37114836/20240223-atmoscience-6a0dc0035e92159168f49b89caeed29f2ac1ce6a.png" /><p>Our Master's program in Atmospheric Science starts again in October, and if you would like to join us, you need to apply now. The current application phase runs until March 31. You can find all information about the program and how to apply at mi.uni-hamburg.de/atmoscience. If you have any questions, please contact us. We look forward to hearing from you!</p><p>Photo: UHH/Lange</p>NAGR-fakmin-36903860-production2024-02-01T15:00:00ZHabilitation of Dr. Volker Matthias<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/36903774/20240201-habilitation-volker-matthias-54fa4474a26b0ebac7a325b0c125d393d5d9e737.jpg" />Volker Matthias completed his habilitation with his colloquium lecture on “The impact of ship emissions on air quality in coastal areas” – congratulations! For many years, Universität Hamburg and the internationally renowned scientist, who is head of the “Chemistry Transport Modeling” department at the neighboring Hereon Research Center, have been in close contact in both research and teaching. We are delighted that he will continue to enrich our research landscape in the future and inspire students for atmospheric chemistry.<p>Photo: UHH/Lange</p>NAGR-fakmin-36550201-production2023-12-18T14:00:00ZFlorian Römer about his Paper on Water Vapour Feedback<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/36547093/20231218-metal-florian-7b1866d4642b0631c72c9364cccd618a5d7e4a55.jpg" /><p></p>
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On a warmer Earth due to climate change, more water vapour evaporates into the atmosphere. This water vapour acts as a greenhouse gas and thus changes the thermal radiation of the atmosphere into space, which in turn affects the temperature down on Earth. Florian Römer, a doctoral student at the Meteorological Institute of Universität Hamburg, and his colleagues have investigated how this important feedback in the climate system works, with respect to individual wavelengths of the thermal radiation. In his paper “Direct observation of Earth's spectral long-wave feedback parameter”, he describes how the strength of this feedback can be derived from satellite measurements. In this video he talks about his work on this study.</p>
<p>English subtitles available – activate in YouTube!</p>
<p>This video is the third episode of our (M)et al. video series presenting scientists from the Meteorological Institute reporting on their current papers and thus offering an insight into our research topics and working methods.</p>
<p>Link to the paper: doi.org/10.1038/s41561-023-01175-6</p><p>Photo: UHH/Clemens</p>NAGR-fakmin-36424650-production2023-12-04T23:00:00ZBastian Kirsch about his Paper on Cold Pools<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/36422010/20231205-metal-bastian-1c18cfd94c5da136f76b6444f8232a5814ce6302.jpg" /><p></p>
<p>When the air under a thundercloud is being cooled by the falling rain, this cold air moves downwards and spreads out on the ground like tipped-out water. We cannot see these "cold pools", but we can feel them, for example, as a fresh breeze or gust, just before the thunderstorm arrives. Dr. Bastian Kirsch from the Meteorological Institute at Universität Hamburg and his colleagues have studied the structure and development of such cold pools in more detail. In particular, they were able to measure them for the first time in nature using a dense network of 100 weather stations and published the results in the paper "Morphology and growth of convective cold pools observed by a dense station network in Germany". In this video, he talks about his work on this study.</p>
<p>English subtitles available – activate in YouTube!</p>
<p>This video is the second episode of our (M)et al. video series presenting scientists from the Meteorological Institute reporting on their current papers and thus offering an insight into our research topics and working methods.</p>
<p>Link to the paper: doi.org/10.1002/qj.4626</p>
<p>Photo: UHH/Clemens</p>NAGR-fakmin-36311424-production2023-11-22T23:00:00ZPhD Vacancy in Experimental Meteorology<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/36310739/20231123-coldpoolstelle-7030264e387173d131fcf54deed5572a61abb42f.jpg" /><p>Interested in experimental meteorology, in planning, realizing and evaluating field measurements? We have an immediate vacancy for a PhD position in the HErZ project "Capitalizing in Cold Pool Observations". The detailed job description can be found here. Prof. Dr. Felix Ament will be happy to answer any further questions.</p><p>Photo: UHH/Lange</p>NAGR-fakmin-36115277-production2023-11-06T09:00:00ZVictor Avsarkisov leads a new research group<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/36115112/victor-avsarkisov-733x414-83cda69be514eaa7e9a9959c4bf0e34e2dc4a127.jpg" /><p>Dr. Victor Avsarkisov joins the Meteorological Institute as a research group leader for the stratified mesoscale turbulence processes. Within his newly established Stratified Turbulence in the Middle Atmosphere research group, he will explore the complex mesoscale dynamics of the lower and middle atmosphere using the theory of stratified turbulence, observations, and numerical simulations. This initiative will close the gap in understanding the multi-scale nature of the stratified atmospheric turbulence processes and serve as a solid (mechanistic) background for a novel sub-grid scale turbulence parameterization strategy for future NWP and GCM simulations.</p><p>Photo: Victor Avsarkisov</p>NAGR-fakmin-35977839-production2023-10-22T22:00:00ZJule Radtke about her Paper on Trade Wind Clouds and Precipitation<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/35977212/20231023-metal-jule-b3d0ebe62aede1fc88aca7a45891bbfa0fd9a926.jpg" /><p></p>
<p>What is the interaction between clouds and precipitation over the tropical Atlantic? What determines the size and structure of cloud formation, which itself feeds back on global warming? These questions where investigated by Dr. Jule Radtke from the Meteorological Institute of Universität Hamburg and her colleagues, published in the paper "Spatial organisation affects the pathways to precipitation in simulated trade-wind convection". In this video, she reports on her work on this study, inlcuding a research trip to the Caribbean island of Barbados.</p>
<p>English subtitles available – activate in YouTube!</p>
<p>This video is also the start of our new video series presenting scientists from the Meteorological Institute reporting on their current papers and thus offering an insight into our research topics and working methods. More videos will follow.</p><p>Photo: UHH/Clemens</p>NAGR-fakmin-35978798-production2023-10-21T22:00:00ZScholar-ships for Meteorology and Atmospheric Science<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/35978051/20231022-deutschlandstipendium-ff5ec0ed079be8cf7c52d5ff0af2e34af59adfa6.jpg" /><p>Our Schrader Foundation supports you again this year with the German public-private Scholar-ship (Deutschlandstipendium), one for the BSc Meteorology and one for the MSc Atmospheric Science. Apply now – it's worth it! All information about the application until 6 Nov 2023 can be found here: www.uni-hamburg.de/deutschlandstipendium/stipendiaten-innen.</p><p>Photo: Michel Dingler</p>NAGR-fakmin-35852109-production2023-10-08T22:00:00ZGe Cheng’s PhD defense<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/35852187/20231009-defense-ge-cheng-027a307cac5c32cffd16ddb78585b1e13c684bdc.jpeg" /><p>Congratulations to Ge Cheng for her PhD with the topic "Parameterization of canopy processes for atmospheric models". Ge has developed a parametrisation for heteogeneous urban canopies in coarse numerical models. The new parametrisaion GeCap is based on nudging, a techniques that is easy to calculate and already implemented in many numerical models. Fur urban canopies GeCap includes the impact of buildings on wind, turbulence and temperature calculated from the enclosed building volume and the indoor temperature of buildings. Model runs using the meso-scale model METRAS for Hamburg show, that the urban imact on wind and temperature can be reproduced. Due to the low computational cost and the basic building parameters the method may be used to consider urban impacts in global scale models.</p><p>Photo: Cheng</p>NAGR-fakmin-35120542-production2023-07-25T22:00:00ZJule Radtke Receives 2023 CFMIP-GASS Early Career Scientist Award<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/35120572/20230726-posteraward-jule-radtke-95b7e775ea224cd063319fd70948b86d89f413e5.jpg" /><p>Jule Radtke, postdoctoral researcher in the CLICCS working group on Drivers of Tropical Circulations, was awarded the Early Career Scientist (ECS) Award at the joint CFMIP-GASS 2023 conference in Paris. The award recognises her poster presentation entitled “Spatial Organization Affects the Pathway to Precipitation in Simulated Trade Wind Convection” (PDF) as one of the six best outstanding contributions by early career scientists.</p>
<p>Trade wind clouds are ubiquitous in the tropical oceans and play an important role in cooling the Earth by reflecting solar radiation. How their population, and thus their cooling effect, evolves in a warming climate is a major uncertainty in climate projections. One difficult aspect is that trade wind clouds often organise themselves in mesoscale patterns that appear to be associated with precipitation. However, the interaction between these two processes is still poorly understood. This makes it difficult to better understand the sensitivity of the trade wind cloud population to perturbations such as a warming climate.</p>
<p>Jule Radtke investigates the relationship between spatial organisation and precipitation development using high-resolution hectometer-scale simulations conducted for the period of the EUREC⁴A field campaign. In these simulations, she decomposes the pathway to surface precipitation into two phases: the formation phase, in which cloud droplets are converted into rain, and the sedimentation phase, in which the formed rain falls to the ground, part of which evaporates before reaching the surface. She finds that organisation affects how these two phases contribute to the development of surface precipitation, and concludes that the pathway to precipitation differs with organisation.</p>
<p>A publication on these analyses and results is currently under review for “Geophysical Research Letters”. A pre-print version is available at the following link: https://doi.org/10.22541/essoar.167979635.58663858/v2</p><p>Photo: UHH/MI/Lange</p>NAGR-fakmin-34977861-production2023-06-28T22:00:00ZBenedikt Seitzer’s PhD defense<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/34951820/20230629-defense-benedikt-seitzer-00efb01c824a1c7f5aff73b971cd454218b4fa78.jpg" /><p>Congratulations to Benedikt Seitzer for his PhD with the topic “The influence of geometric model complexity on near-wall flow phenomena and their resolution in Large-Eddy Simulations”. Based on wind tunnel measurements, Benedikt examined the influence of surface roughness on flow phenomena close to the wall. The aim of the investigations was to validate the replication of near-wall turbulence at rough surfaces in large-eddy simulations (LES). Findings from both experiments indicate an underestimation of wall-normal turbulent fluxes by LES model PALM with respect to the wind-tunnel results. This difference can be significantly eliminated either by artificially increasing the roughness lengths in the surface boundary condition, by increasing the grid resolution, or by choosing scale-dependent sub-grid scale models.</p><p>Photo: UHH/MI/Lange</p>NAGR-fakmin-34747778-production2023-06-06T22:00:00ZSimon Michel’s PhD defense<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/34741141/20230607-defense-simon-michel-890611a59089ca3a89b7208171116ce2a8d735b9.jpg" /><p>Congratulations to Simon Michel for his PhD with the topic “Feasibility Study of Heavy Gas Dispersion Experiments in Complex Environments in Physical Modelling”. Based on wind tunnel measurements, Simon analyzed the dispersion of heavy gases in complex environments. Here, Simon was able to show relationships between the distribution functions of the measured concentrations and the heavy gas effect. In addition, a data set for validating numerical models was generated as part of the work.</p><p>Photo: UHH/MI/Lange</p>NAGR-fakmin-34297332-production2023-04-19T22:00:00ZFirst direct observation of the spectral fingerprint of Earth's climate feedback<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/34300531/iasi-observations-733x414-59e20f3e96edacb43af74045115cafd6911e0848.jpg" /><p>In a new study in Nature Geoscience, Florian Römer demonstrates that the spectral feedback parameter, a central quantity in climate science, can be directly observed using satellites. It shows how Earth adjusts its radiation balance when its temperature changes. This helps us better understand the feedback processes that govern Earth's climate.</p>
Article in Nature Geoscience
Blogpost "Behind the Paper"
CEN News
<p>Photo: ESA - AOES Medialab</p>NAGR-fakmin-34154587-production2023-03-28T22:00:00ZJule Radtke’s PhD defense<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/34154488/20230329-defense-jule-radtke-4f0405a12a96ed816082e686afa3b92d1e0fe3a5.jpg" /><p>Congratulations to Jule Radtke for her PhD with the topic “On the relationship between precipitation and spatial organization in the trades”! She has discovered a mechanism how precipitation from shallow clouds in the trade wind region can spatially organize to rain efficiently even in dry ambient air. For more information, see her paper “The relationship between precipitation and its spatial pattern in the trades observed during EUREC4A” and a forthcoming publication.</p><p>Photo: UHH/Kirsch</p>NAGR-fakmin-34089936-production2023-03-27T22:00:00ZStefan Bühler selected as the 10th Liebe Fellow by USNC-URSI<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/34090103/liebe-lecture-733x414-089a7aabcf689f22257445d9fae23cb899bdc738.jpg" /><p>Stefan Bühler has been selected as 10th H. J. Liebe Fellow of the U.S. National Committee (USNC) of the International Union of Radio Scientists (URSI). The video of his Liebe lecture "How Water Shapes Climate" is now available. It was delivered by video to the USNC annual meeting in January.</p>
<p>The Hans Liebe Lectureship Series</p>
<p>Liebe Lecture Video - How Water Shapes Climate</p><p>Photo: UHH / USNC-URSI</p>NAGR-fakmin-34089866-production2023-03-26T22:00:00Z“My work will help depict climate change more precisely”<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/33949231/kaah-menang-733x414-0ad04d7864680eca93cdd2401bf92a5d469bad95.jpg" />Since this March, meteorologist Dr. Kaah Menang has been a Humboldt Fellow at the CEN. The research scholarship, awarded by the Humboldt Foundation, supports international postdocs and experienced researchers who plan to conduct research in Germany. In the following interview, Menang explains what he’s working on here and what made him choose Universität Hamburg.<p>Photo: UHH/CEN/Keller</p>NAGR-fakmin-33828585-production2023-03-02T23:00:00ZTheresa Lang's PhD Defense<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/33827875/lang-phd-733x414-2a6e8c8b69dc5bd921b838a6697c3a41b5efc5b3.jpg" /><p>Theresa Lang successfully defended her PhD thesis "On the Uncertainty in Modelling Tropical Relative Humidity".</p>
<p>You can learn more about her research on how global storm resolving models represent humidity in the free troposphere in this publication:</p>
<p>Tropical free-tropospheric humidity differences and their effect on the clear-sky radiation budget in global storm-resolving models</p>
<p>Preprint of another one coming online soon.</p>
<p></p><p>Photo: Theresa Lang</p>NAGR-fakmin-33674237-production2023-02-14T23:00:00ZNew: M.Sc. Atmospheric Science – apply now!<img width="293" height="165" style="float:left" src="https://assets.rrz.uni-hamburg.de/instance_assets/fakmin/33674193/dsc-7858-cut-733x414-58537c884afaf348fa4f0615dbcab8f65d077b06.jpg" /><p>The newly designed M.Sc. Atmospheric Science will start in autumn. Set the course for your career now and apply before the deadline on 31 March 2023. You can find all information about the study program and the application here. Please contact us in case of any questions.</p><p>Photo: MI/Ch. Dix</p>