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Here are the current Papers & Articles under the research topic Planetary Waves (Rossby Waves). Click on the title of a paper you are interested in to go straight to the full paper. What is a Rossby Wave? A Fact Sheet A climatology of polar winter stratopause warmings and associated planetary wave breaking A Dynamical Model of the Stratospheric Sudden Warming A New Perspective toward Cataloging Northern Hemisphere Rossby Wave Breaking on the Dynamic Tropopause Amplified Rossby waves enhance risk of concurrent heatwaves in major breadbasket regions 2019 paper. Abstract: In an interconnected world, simultaneous extreme weather events in distant regions could potentially impose high-end risks for societies1,2. In the mid-latitudes, circum-global Rossby waves are associated with a strongly meandering jet stream and might cause simultaneous heatwaves and floods across the northern hemisphere3–6. For example, in the summer of 2018, several heat and rainfall extremes occurred near-simultaneously7. Here we show that Rossby waves with wave numbers 5 and 7 have a preferred phase position and constitute recurrent atmospheric circulation patterns in summer. Those patterns can induce simultaneous heat extremes in specific regions: Central North America, Eastern Europe and Eastern Asia for wave 5, and Western Central North America, Western Europe and Western Asia for wave 7. The probability of simultaneous heat extremes in these regions increases by a factor of up to 20 for the most severe heat events when either of these two waves dominate the circulation. Two or more weeks per summer spent in the wave-5 or wave-7 regime are associated with 4% reductions in crop production when averaged across the affected regions, with regional decreases of up to 11%. As these regions are important for global food production, the identified teleconnections have the potential to fuel multiple harvest failures, posing risks to global food security. Blocking high influence on the stratospheric variability through enhancement and suppression of upward planetary-wave propagation Dynamics of 2013 Sudden Stratospheric Warming event and its impact on cold weather over Eurasia: Role of planetary wave reflection Extraordinary Features of the Planetary Wave Propagation During the Boreal Winter 2013/2014 and the Zonal Wave Number Two Predominance Extreme weather events in early summer 2018 connected by a recurrent hemispheric wave-7pattern 2019 paper. Abstract: The summer of 2018 witnessed a number of extreme weather events such as heatwaves in NorthAmerica, Western Europe and the Caspian Sea region, and rainfall extremes in South-East Europe andJapan that occurred near-simultaneously. Here we show that some of these extremes were connectedby an amplified hemisphere-wide wavenumber 7 circulation pattern. We show that this patternconstitutes an important teleconnection in Northern Hemisphere summer associated with prolongedand above-normal temperatures in North America, Western Europe and the Caspian Sea region. Thispattern was also observed during the European heatwaves of 2003, 2006 and 2015 among others. Weshow that the occurrence of this wave 7 pattern has increased over recent decades. Internal wave coupling processes in Earth’s atmosphere Planetary‐scale wave activity as a source of varying tropospheric response to stratospheric sudden warming events: A case study Sudden Stratospheric Warmings and Anomalous Upward Wave Activity Flux The Life Cycle of Northern Hemisphere Downward Wave Coupling between the Stratosphere and Troposphere The roles of planetary and gravity waves during a major stratospheric sudden warming as characterized in WACCM Vortex Preconditioning due to Planetary and Gravity Waves prior to Sudden Stratospheric Warmings