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Triggering mechanisms of synoptic-scale Rossby waves

English title Triggering mechanisms of synoptic-scale Rossby waves
Applicant Romppainen-Martius Olivia
Number 159905
Funding scheme Project funding (Div. I-III)
Research institution Geographisches Institut Universität Bern
Institution of higher education University of Berne - BE
Main discipline Meteorology
Start/End 01.09.2015 - 30.09.2018
Approved amount 185'963.00
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All Disciplines (2)

Discipline
Meteorology
Climatology. Atmospherical Chemistry, Aeronomy

Keywords (3)

Rossby waves; wave triggering; waveguides

Lay Summary (German)

Lead
Wir erforschen die Entstehung von Rossbywellen in der Atmosphäre. Diese Wellen sind wichtig für das Wetter am Boden.
Lay summary

Rossbywellen sind Wellen die sich in der Atmosphäre in den mittleren Breiten in einer Höhe von 8 bis 12 km von Westen nach Osten bewegen. Sie sind eng verbunden mit der Wetterentwicklung am Boden, unterhalb der Wellentäler befinden sich am Boden Hochdruckgebiete und unterhalb der Wellentröge befinden sich Tiefdruckgebiete. Die Rossbywellen bestimmen die Zugbahn und Zuggeschwindigkeit dieser Wettersysteme entscheidend mit und sind deshalb aus Sicht der Wettervorhersage ein wichtiges und interessantes Forschungsgebiet. Zudem können diese Wellen wenn sie über Westeuropa brechen zu Starkniederschlägen auf der Alpensüdseite führen.
In diesem Projekt wird die Entstehungsphase dieser Wellen im Detail angeschaut. Wir untersuchen wann, wo und weshalb diese Wellen entstehen. Erste Ergebnisse zeigen dass die Wellen im Winter vor allem im westlichen Pazifik und etwas weniger häufig auch im westlichen Atlantik entstehen.  

 

Direct link to Lay Summary Last update: 21.10.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Recurrent Synoptic-Scale Rossby Wave Patterns and Their Effect on the Persistence of Cold and Hot Spells
Röthlisberger Matthias, Frossard Linda, Bosart Lance F., Keyser Daniel, Martius Olivia (2019), Recurrent Synoptic-Scale Rossby Wave Patterns and Their Effect on the Persistence of Cold and Hot Spells, in Journal of Climate, 32(11), 3207-3226.
The climatological impact of recurving North Atlantic tropical cyclones on downstream extreme precipitation events
Pohorsky Roman, Roethlisberger Matthias, Grams Christian, Ripoldi Jacopo, Martius Olivia (2019), The climatological impact of recurving North Atlantic tropical cyclones on downstream extreme precipitation events, in Monthly Weather Review, 1.
A severe hail storm in complex topography in Switzerland - Observations and processes
Trefalt Simona, Martynov Andrey, Barras Hélène, Besic Nikola, Hering Alessandro M., Lenggenhager Sina, Noti Pascal, Röthlisberger Matthias, Schemm Sebastian, Germann Urs, Martius Olivia (2018), A severe hail storm in complex topography in Switzerland - Observations and processes, in Atmospheric Research, 209, 76-94.
Rossby Wave Initiation by Recurving Tropical Cyclones in the Western North Pacific
Riboldi Jacopo, Röthlisberger Matthias, Grams Christian M. (2018), Rossby Wave Initiation by Recurving Tropical Cyclones in the Western North Pacific, in Monthly Weather Review, 146(5), 1283-1301.
Full Access Northern Hemisphere Rossby Wave Initiation Events on the Extratropical Jet—A Climatological Analysis
RoethlisbergerMatthias (2018), Full Access Northern Hemisphere Rossby Wave Initiation Events on the Extratropical Jet—A Climatological Analysis, in Journal of Climate, 743.
An algorithm for identifying the initiation of synoptic-scale Rossby waves on potential vorticity waveguides
Röthlisberger Matthias, Martius Olivia, Wernli Heini (2016), An algorithm for identifying the initiation of synoptic-scale Rossby waves on potential vorticity waveguides, in Quarterly Journal of the Royal Meteorological Society, 142(695), 889-900.
Regional-scale jet waviness modulates the occurrence of midlatitude weather extremes
Röthlisberger Matthias, Pfahl Stephan, Martius Olivia (2016), Regional-scale jet waviness modulates the occurrence of midlatitude weather extremes, in Geophysical Research Letters, 43(20), 10,989-10,997.

Collaboration

Group / person Country
Types of collaboration
Hein Wernli, ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Department Seminar, Department of Atmospheric and Oceanic Sciences, University of Wisconsin Individual talk Northern Hemisphere Rossby wave initiation events on the extratropical jet - climatology and some applications 14.03.2018 Madison, Wisconsin, United States of America Roethlisberger Matthias;
43th Northeastern Storm Conference Talk given at a conference A climatologcial analysis of Rossby wave initiation on the Northern Hemisphere midlatitude jet 10.03.2018 Saratoga Springs, NY, United States of America Roethlisberger Matthias;
Climate Group Seminar, State University of New York at Albany Individual talk Northern Hemisphere Rossby wave initiation events on the extratropical jet - climatology and some applications 02.03.2018 Albany, NY, United States of America Roethlisberger Matthias;
18th Cyclone Workshop Talk given at a conference Northern Hemisphere Rossby wave initiation events on the extratropical jet - a climatological analysis 01.10.2017 St. Adèle, Canada Roethlisberger Matthias;
Seminar, Department of Meteorology, University of Reading Individual talk Northern Hemisphere Rossby wave initiation events on the extratropical jet - a climatological analysis 27.06.2017 Reading, UK, Great Britain and Northern Ireland Roethlisberger Matthias;
NAWDEX Workshop, LMU Munich Talk given at a conference Objectives and flight planning of the NAWDEX TPV-flights 08.03.2017 München, Germany Roethlisberger Matthias;
15th Swiss Climate Summer School, Grindelwald, Switzerland Poster Regional-Scale Jet Waviness Modulates the Occurrence of Mid-Latitude Weather Extremes 28.08.2016 Grindelwald, Switzerland Roethlisberger Matthias;
European Geoscience Union 2016 Poster Regional-Scale Jet Waviness Modulates the Occurrence of Mid-Latitude Weather Extremes 23.04.2016 Wien, Austria Roethlisberger Matthias;
European Geoscience Union 2016 Talk given at a conference Detection, Dynamics and Climatology of Rossby Wave Initiation on the Extratropical Waveguide 23.04.2016 Wien, Austria Roethlisberger Matthias;
Swiss Global Change Day 2016 Poster Regional-Scale Jet Waviness Modulates the Occurrence of Mid-Latitude Weather Extremes 12.04.2016 Bern, Switzerland Roethlisberger Matthias;
17th Cyclone Workshop Talk given at a conference An Algorithm for Identifying the Initiation of Synoptic-Scale Rossby Waves on PV Waveguides 25.10.2015 Monterey, United States of America Roethlisberger Matthias;


Awards

Title Year
Fakultätspreis der Phil. Nat. Fakultät der Univeristät Bern 2019

Associated projects

Number Title Start Funding scheme
137543 Rossby wave precursors to heavy precipitation events in Switzerland: dynamics and forecast errors 01.02.2012 Project funding (Div. I-III)
178751 Persistent atmospheric flow situations and temporal clustering of precipitation extremes 01.10.2018 Project funding (Div. I-III)
143219 Long-term changes of weather extremes in a large ensmble of climate model simulations (EXTRA-LARGE) 01.09.2013 Project funding (Div. I-III)

Abstract

Synoptic-scale Rossby waves (RW) together with jets and vortices form the building blocks of tropopause level dynamics. They play a key role for the daily surface weather evolution, including the formation of extreme weather events. Synoptic-scale RW are closely tied to the propagation of forecast errors in numerical weather prediction systems. More recently a vivid debate on the effects of global change on RW dynamics and the associated extreme weather has received a lot of attention. In this project the triggering phase of synoptic-scale RW will be investigated. We plan to study in detail the dynamical processes that are crucial in a very early stage of the life-cycle of a RW. To this end an algorithm is developed that objectively detects the formation phase of synoptic-scale RW in reanalysis data sets. The algorithm will use the “waviness” of the jet waveguides on the dynamical tropopause to search for time instances where locally a transition occurs from an undisturbed waveguide to a growing wave disturbance. The time, the longitudinal sector and the type of waveguide (extratropical, subtropical) will be extracted to compile a climatology of wave triggering events in all four seasons and for both the northern and the southern hemisphere.Based on this data set the role of different wave triggering mechanisms described will be investigated from a potential vorticity (PV) point of view for a large number of triggering events. Wave triggering mechanisms include: the recurvature of a tropical cyclone, outflow from meso-scale convective systems in the vicinity of the waveguide, and stratospheric high PV anomalies approaching the waveguide. The role of each of these processes for triggering RW in different seasons and different geographical areas will be quantified. In addition one process, the so-called PV couplet triggering process, i.e. the joint propagation of a stratospheric high- and low-PV anomaly toward the waveguide will be investigated in more detail.
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