2023/05/12 4:34

AOGS2023

Wing Ip Medal Lecture | 2 Aug (Wed) 8:15 AM – 10:00 AM | MR308 – 310
Stratosphere-Troposphere Dynamical Coupling

Shigeo YODEN
Institute for Liberal Arts and Sciences,
Kyoto University, Japan
Shigeo Yoden is a Professor Emeritus of Kyoto
University (KU), and Vice Director at the Institutefor Liberal Arts and Sciences, KU. He received his
D.Sc. from KU in 1983 and has over 37 years ofprofessional experience at the Department ofGeophysics, KU as a Research Associate,
Associate
Professor,andProfessorofMeteorology (2002 to 2020).
Yoden's research interests include the dynamicsof atmospheres, climates, and geophysical fluids,applying computational sciences to numericalmodel experiments and data analyses. He has
published over 120 peer-reviewed articles andsupervised 14 Ph.D. and 30 Master’s students. He
is an active member of the WCRP/Stratospheretroposphere Processes And their Role in Climate,serving as a member of the Scientific SteeringGroup (1999 to 2005) and as a theme leader for“Stratosphere-Troposphere Dynamical Coupling”(2005 to 2015) and “Stratospheric andTropospheric Influences on Tropical ConvectiveSystems” (2016 to the present). He also served as
the president of the IUGG/IAMAS/International
Commission on Middle Atmosphere (2007 to2011) and as an editor of the Journal of theAtmospheric Sciences of the American
Meteorological Society (2009 to 2011).
He directed the KU Active Geosphere
Investigations for the 21st Century COE Program(KAGI21) from 2003 to 2007. At the 1st AOGS
meeting, he gave a public lecture titled “ActiveGeosphere: A New Interdisciplinary Approach toEarth Science from Asia and Oceania”. He alsoorganized the KAGI21 International Summer
School nine times from 2004 to 2018, held inKyoto and Bandung, with a total of 306 students
from 22 countries.

https://www.asiaoceania.org/aogs2023/public.asp?page=AWIM_2023.asp

Abstract: It is an honor to receive the 2023 AOGS Wing Ip Medal, given that solar physics and planetaryatmospheres are among Professor Ip’s main research fields, and those areas overlap with some of myrecent interdisciplinary research, which has focused on the relationships between solar activity
variations and weather and climate responses on multiple scales. Specifically, we have conducted data
analysis on the influence of solar-modulated galactic cosmic rays on global cloud distribution andregional atmospheric circulations (Kumar et al. 2023; Sci. Rep.), an Earth-system simulation on thetransport and deposition of 10Be produced by the strongest solar proton event during the Holoceneknown as the Miyake Event around 774 CE/775 (Spiegl et al. 2022; JGR), and paleoclimate simulationsof the Mid-Holocene and the Last Glacial Maximum to assess the impacts of stratospheric ozone
chemistry associated with Milankovitch-cycle variations of solar insolation (Noda et al. 2017, 2018; JGR).
The common framework behind these works is the dynamical coupling between the stratosphere andthe troposphere. This has been my life’s work since my early career experience as a Japan Society for
the Promotion of Science (JSPS) Fellow for Research Abroad from 1985 to 1987 at the University ofWashington under the guidance of Professor James R. Holton. I thoroughly investigated the nonlinear
structure of a simple low-order model that describes the interaction between the zonal-mean zonal
flow and planetary-scale Rossby waves propagating upward from the troposphere to the stratosphereto clarify the interrelationships among three stratospheric sudden warming theories and discuss thediversity of winter polar vortex variability originating from the occurrence of such extreme events(Yoden, 1987a,b,c; JAS).
Since then, my research group at Kyoto University has used a hierarchy of numerical models, fromsimple low-order models to complex high-end general circulation models of the atmosphere andEarth system models, to study the dynamical coupling between the stratosphere and troposphere. I
also served as a theme leader of “Stratosphere-Troposphere Dynamical Coupling” in the World Climate
Research Programme/Stratosphere-troposphere Processes And their Role in Climate (WCRP/SPARC)
from 2005 to 2015, after serving as a member of its Scientific Steering Group from 1999 to 2005. I haveorganized and led many international conferences and workshops, including the JSPS/NSF Japan-U.S.
Seminar on “Coupling of the Troposphere and Stratosphere by Dynamical, Radiative, and Chemical
Processes” in Kyoto, Japan, in 2001 (Yoden et al. Eds. 2002; JMSJ), and the AGU Chapman Conference
on “Jets and Annular Structures in Geophysical Fluids” in Savannah, USA, in 2006 (Robinson and YodenEds. 2007; JAS).
Most studies on the stratosphere-troposphere dynamical coupling had focused on middle and highlatitudes, where the standard paradigms for interpretation and explanation are based on balanced
dynamics (i.e., the non-local aspects of potential vorticity inversion). However, no comparable
interpretive paradigm exists in the tropics, where mesoscale deep moist convection and its
organization into multi-scale convective systems are the fundamental frameworks of their dynamics.
About a decade ago, the understanding and simulation capability of such tropical convective systems
had been still limited, which was the motivation to start the “Stratospheric And Tropospheric
Influences On Tropical Convective Systems (SATIO-TCS)” activity under WCRP/SPARC in 2016 (e.g.,Hitchman et al. 2021; JMSJ, Haynes et al. 2021; JMSJ). Our contributions in observational, global
modeling, and cloud-resolving modeling studies on tropical convection, convective systems, and theirmulti-scale dynamics are multifaceted under the collaborations with early career researchers from Asiaand the world (including, Bui, Chhin, Dhaka, Fajary, Hadi, Hitchcock, Jain, Koh, Kumar, Martin, Spiegl,
Thalongsengchanh, and Trilaksono).

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AOGS2023

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