Abstract
The study of Rossby wave propagation in strong jet stream waveguides is essential, as extreme weather events are associated with persistent atmospheric patterns at the surface which may be favored by quasi stationary Rossby waves in the upper troposphere through these pathways. But so far, all the studies are mostly for winter and summer seasons. Therefore, in the present study, we extended earlier works to the transition seasons. The waveguide patterns in both hemispheres during the spring and autumn transition seasons are explored using numerical simulations from a baroclinic model with six selected forcings in the 1979–2016 period. The results show that stronger subtropical jet streams are found in boreal and austral spring associated with stronger wave propagation. Particularly, stronger eddy kinetic energy and wave activity flux are found in boreal spring from the north of Middle East to eastern North Pacific, associated with stronger subtropical Asian jet, and in austral autumn in western Pacific region, associated with greater extension of polar jet. Interhemispheric propagation is verified in spring season in both hemispheres, through the equatorial eastern Pacific and Atlantic ducts, with a northwest-southeast orientation.
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Data availability
The datasets generated during and/or analysed during the current study are not publicly available, but are available from the corresponding author on reasonable request.
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Acknowledgements
We thank two reviewers for their careful reading of our manuscript and their many insightful comments and suggestions. TA was partially funded by the National Institute of Science and Technology for Climate Change Phase 2 under Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Grant number 465501/2014-1; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grant numbers 2014/50848-9 and 2017/09659-6. TA also had partial support from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) 301397/2019-8.
Funding
TA was partially funded by the National Institute of Science and Technology for Climate Change Phase 2 under Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Grant number 465501/2014-1; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grant numbers 2014/50848-9 and 2017/09659-6. TA also had partial support from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) 301397/2019-8.
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The idea of studying the transition seasons was due to VBR. All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by ACVF and HB. The first draft of the manuscript was written by ACVF and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Freitas, A.C.V., Rao, V.B., Braga, H.A. et al. Rossby wave propagation in the transition seasons. Clim Dyn (2024). https://doi.org/10.1007/s00382-024-07255-6
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DOI: https://doi.org/10.1007/s00382-024-07255-6