A067
Extratropical Large-Scale Atmospheric Circulation Variability
Session ID#: 74809
Session Description:
The extratropical atmospheric circulation is characterized by large-scale variability patterns such as blocking events, large-amplitude/quasi-stationary planetary waves, and annular modes. The midlatitude variability is important to the extratropical weather (and weather extremes), as well as the interaction of the extratropical troposphere with the tropics, stratosphere, ocean, and cryosphere. While widely studied, many questions remain unanswered about the dynamics, predictability, and climate projections of the extratropical atmospheric variability, and current weather/climate models have difficulties faithfully reproducing some of the observed behavior.
The goal of this session is to synthesize observational, hierarchical modeling, and theoretical studies of various aspects of this variability such as the associated dynamics, sources of predictability, responses to climate change, and connections with weather extremes. A deeper understanding will improve weather predictions on sub-seasonal and longer timescales, and help with interpreting regional responses to climate change. These are active areas of research with significant scientific and socio-economic impacts.
Index Terms:
3305 Climate change and variability [ATMOSPHERIC PROCESSES]
3319 General circulation [ATMOSPHERIC PROCESSES]
3320 Idealized model [ATMOSPHERIC PROCESSES]
3337 Global climate models [ATMOSPHERIC PROCESSES]
Primary Convener: Pedram Hassanzadeh, Rice University, Houston, TX, United States
Conveners: Elizabeth A Barnes, Colorado State University Fort Collins, Fort Collins, CO, UNITED STATES, Aditi Sheshadri, Columbia University of New York, Palisades, NY, United States and Ding Ma, Columbia University, New York, NY, United States
Primary Liaison: Pedram Hassanzadeh, Asst. Professor, Mechanical Engineering, Houston, United States
Importance of a vertically tilting structure for energizing the North Atlantic Oscillation (495715)
Patrick Martineau1, Hisashi Nakamura1, Yu Kosaka2 and Ayako Yamamoto3, (1)University of Tokyo, Bunkyo-ku, Japan, (2)Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan, (3)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanagawa, Japan
Variability of the Southern Annular Mode and Southern Ocean Surface Westerly Winds in E3SM (511989)
Doo Young Lee, Los Alamos National Laboratory, Los Alamos, New Mexico, United States, Mark R Petersen, Los Alamos National Laboratory, Los Alamos, NM, United States and Wuyin Lin, Brookhaven National Laboratory, Upton, NY, United States
The Structure and Evolution of Persistent Ridge Regimes across Western North America during the Transition Seasons (519917)
Tyler Christopher Leicht1, Alexander Mitchell1 and Lance F Bosart2, (1)University at Albany State University of New York, Albany, NY, United States, (2)SUNY Albany, Atmospheric and Environmental Sciences, Albany, NY, United States
Does the high climate sensitivity in some CMIP6 models affect future SAM trends? (542371)
Tom Wood1, Amanda Maycock1, John C Fyfe2 and Francois Engelbrecht3, (1)University of Leeds, Leeds, LS2, United Kingdom, (2)Environment Canada, Canadian Centre for Climate Modeling and Analysis, Victoria, BC, Canada, (3)University of Witwatersrand, Global Change Institute, Pretoria, South Africa
Quantitatively Isolating the Extratropical Atmospheric Impact on Tropical Pacific in Coupled Climate Model (542626)
Jingzhe Sun1,2, Zhengyu Liu2, Feiyu Lu3, Weimin Zhang1,4 and Huizan Wang1, (1)National University of Defense Technology, College of Meteorology and Oceanography, Changsha, China, (2)The Ohio State University, Columbus, OH, United States, (3)Princeton University, Princeton, NJ, United States, (4)Laboratory of Software Engineering for Complex Systems, Changsha, China
Modulation of Sudden Stratospheric Warmings by ENSO and the PDO (545732)
Froila Palmeiro1, Javier García-Serrano1, Constantin Ardilouze2, Lauriane Batté2, Marianna Benassi3 and Silvio Gualdi4, (1)Universitat de Barcelona (UB), Group of Meteorology, Barcelona, Spain, (2)CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France, (3)Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC), Bologna, Italy, (4)Fondazione CMCC, Bologna, Italy
The Downstream Impacts of West Coast Ridge Regimes over Northern and Central America (549602)
Alexander Mitchell, University at Albany State University of New York, Albany, NY, United States, Tyler Christopher Leicht, University at Albany/SUNY, Department of Atmospheric and Environmental Sciences, Albany, NY, United States and Lance F Bosart, SUNY Albany, Atmospheric and Environmental Sciences, Albany, NY, United States
Regime-Dependent S2S Forecast Skill Over the North America (551010)
Ebrahim Nabizadeh, Rice University, Houston, TX, United States, Sandro W. Lubis, University of Chicago, Chicago, IL, United States and Pedram Hassanzadeh, Asst. Professor, Mechanical Engineering, Houston, United States
A Recipe for Greenland snow events: Atmospheric Blocking and Moisture (551384)
Stephanie A Henderson, University of Wisconsin-Madison, Atmospheric and Oceanic Sciences, Madison, WI, United States, Claire Pettersen, University of Wisconsin Madison, Space Science and Engineering Center, Madison, WI, United States, Ralf Bennartz, Vanderbilt University, Nashville, TN, United States and Melissa Breeden, NOAA Earth System Research Laboratory, Boulder, CO, United States
Ural Blocking Driving Arctic Sea-ice Loss, Cold Eurasia and Stratospheric Vortex Weakening in Autumn and Early Winter 2016-2017 (555513)
Evangelos Tyrlis1, Elisa Manzini1, Juergen Bader2, Jinro Ukita3, Hisashi Nakamura4 and Daniela Matei1, (1)Max Planck Institute for Meteorology, Hamburg, Germany, (2)Max Planck Institute for Meteorology, The Land in the Earth System, Hamburg, Germany, (3)Niigata University, Faculty of Science, Niigata, Japan, (4)University of Tokyo, Bunkyo-ku, Japan
Key role of western boundary currents in wintertime Euro-Atlantic blocking (575571)
Ayako Yamamoto1, Masami Nonaka2, Akira Yamazaki2, Patrick Martineau3, Young-Oh Kwon4, Hisashi Nakamura3 and Bunmei Taguchi5, (1)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanagawa, Japan, (2)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan, (3)The University of Tokyo, Tokyo, Japan, (4)Woods Hole Oceanographic Institution, Physical Oceanography Department, Woods Hole, MA, United States, (5)University of Toyama, Faculty of Sustainable Design, Toyama, Japan
Increased Shear in the North Atlantic Upper-Level Jet Stream over the Past Four Decades (591019)
Paul Williams1, Simon Lee2 and Tom Frame2, (1)University of Reading, Meteorology, Earley Gate, Reading, United Kingdom, (2)University of Reading, Meteorology, Reading, United Kingdom
Impact of the North Atlantic Warming Hole on Sensible Weather (614321)
Melissa Gervais, Pennsylvania State University Main Campus, Meteorology and Atmospheric Science, University Park, PA, United States, Jeffrey L Shaman, Columbia University of New York, New York, NY, UNITED STATES and Yochanan Kushnir, Columbia Univ, Palisades, NY, United States
A Tropically-driven Global Teleconnection Linking the Arctic and Antarctic over the Past Centuries (619907)
Xiaofang Feng1, Qinghua Ding2, Charles Jones2 and Liguang Wu3, (1)Nanjing University of Information Science & Technology, Nanjing, China, (2)University of California Santa Barbara, Santa Barbara, CA, United States, (3)Fudan University, Shanghai, China
Diagnosing North Pacific Blocking using a Linear Inverse Model (627129)
Melissa Breeden, NOAA Earth System Research Laboratory, Boulder, CO, United States, Brett T Hoover, Cooperative Institute for Meteorological and Satellite Studies, Madison, WI, United States, Matthew Newman, University of Colorado at Boulder, Boulder, CO, United States and Daniel Vimont, University of Wisconsin Madison, Madison, WI, United States
