A055
Extratropical Large-Scale Atmospheric Circulation Variability
Session ID#: 161237
Session Description:
The extratropical atmospheric circulation is characterized by large-scale patterns of variability such as blocking events, large-amplitude/quasi-stationary planetary waves, stratospheric polar vortices, and annular modes. This variability is important for 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 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, idealized-to-comprehensive hierarchical modeling, and theoretical studies of various aspects of this variability such as the associated dynamics, sources of predictability, implications of climate model bias for representing extratropical variability and for poor predictive skill, responses to climate change, and connections with weather extremes. A deeper understanding will improve weather prediction on sub-seasonal and longer timescales and help with interpreting regional responses to climate change.
Index Terms:
3305 Climate change and variability [ATMOSPHERIC PROCESSES]
3320 Idealized model [ATMOSPHERIC PROCESSES]
3337 Global climate models [ATMOSPHERIC PROCESSES]
3362 Stratosphere/troposphere interactions [ATMOSPHERIC PROCESSES]
Primary Convener: Paul J Kushner, University of Toronto, Physics, Toronto, ON, Canada
Conveners: Pedram Hassanzadeh, Rice University, Department of Mechanical Engineering and Department of Earth, Environmental and Planetary Sciences, Houston, TX, United States and Aditi Sheshadri, Stanford University, Department of Earth System Science, Stanford, United States
Toward a mechanistic understanding of the Baroclinic Annular Mode (Invited) (1073398)
Madeleine K Youngs, New York University, New York, NY, United States, Edwin P Gerber, New York University, Courant Institute of Mathematical Sciences, New York, NY, United States, Olivier Pauluis, New York University, Courant Institute of Mathematical Science, New York, NY, United States and Dimitrios Giannakis, Dartmouth College, Hanover, United States
Understanding the Links between Winter Surface Temperature Biases and Atmospheric Circulation Anomalies over the Southern Hemisphere in an Ensemble of E3SM Simulations (1076391)
Shixuan Zhang1, Wuyin Lin2, Stephen F Price3, Qi Tang4, Kai Zhang5, Jean-Christophe Golaz4 and Leung Ruby1, (1)Pacific Northwest National Laboratory, Richland, WA, United States, (2)Brookhaven National Laboratory, Upton, NY, United States, (3)Los Alamos National Laboratory, Los Alamos, NM, United States, (4)Lawrence Livermore National Laboratory, Livermore, CA, United States, (5)Pacific Northwest National Lab, Richland, United States
Winter cold surge in Asia linked to weaker polar vortex by Arctic sea ice and Eurasia snow (1084122)
Seong-Joong Kim, Korea Polar Research Institute, Division of Atmospheric Sciences, Incheon, Korea, Republic of (South), Jeong-Hun Kim, Kongju National University, Atmospheric Science, Gongju, Korea, Republic of (South) and Hyesun Choi, Korea Polar Research Institute, Incheon, Korea, Republic of (South)
Earlier Stratospheric Final Warming has caused Warmer Antarctic Summers since the year 1999 (1084824)
Hyesun Choi, Korea Polar Research Institute, Incheon, Korea, Republic of (South), Hataek Kwon, Seoul National University, Seoul, Korea, Republic of (South), Kim Seong-Joong, Korea Polar Research Institute, Incheon, South Korea and Baek-Min Kim, Pukyong National University, Pusan, South Korea
On the Role of Asymmetries in Weather Anomalies Related to the Phases of the North Atlantic Oscillation (1088125)
Jens H Christensen1, Torben Schmith2, Shuting Yang2, Anna Kirschner3 and Simon Peter Helhwerdt3, (1)University of Copenhagen, Niels Bohr Institute, København K, Denmark, (2)Danish Meteorological Institute, København Ø, Denmark, (3)Niels Bohr Institute, Copenhagen, Denmark
Linkages between North Pacific Jet Variability and Rainfall Disturbances in Hawai‘i using K-means Clustering (1105399)
Katrina Fandrich, University at Albany State University of New York, Albany, NY, United States, Oliver Elison Timm, State University of New York at Albany, Department of Atmospheric and Environmental Sciences, Albany, NY, United States and Thomas W Giambelluca, University of Hawaii at Manoa, Water Resources Research Center, Honolulu, HI, United States
Tibetan Plateau’s Far-Reaching Impacts on Arctic and Antarctic Climate: Seasonality and Pathways (1108191)
Liping Wang, Peking University, Department of Atmospheric and Oceanic Sciences, Beijing, China, Haijun Yang, Fudan University, Department of Atmospheric and Oceanic Sciences, Shanghai, China, Qin Wen, Nanjing Normal University, Nanjing, China, Yimin Liu, Inst. of Atmospheric Physics, Beijing, China and Guoxiong Wu, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Positive Eddy Cloud Radiative Feedback to the Southern Annular Mode Revealed from Cloud Locking Experiments (1116075)
Sandro Lubis1, Jian Lu2, Bryce E Harrop3 and L. Ruby Leung3, (1)Pacific Northwest National Laboratory, Richland, United States, (2)Pacific Northwest National Laboratory, Richland, WA, United States, (3)Pacific Northwest National Laboratory, Atmospheric Sciences and Global Change Division, Richland, WA, United States
Destructive Interference of ENSO on North American Precipitation Associated with Aleutian Low/PNA Variability (1123660)
Sarah Larson, North Carolina State University Raleigh, Department of Marine, Earth, and Atmospheric Sciences, Raleigh, NC, United States, Yuko Okumura, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Katinka Bellomo, Polytechnic University of Turin, Department of Environment, Land and Infrastructure Engineering, Turin, Italy and Melissa Breeden, CIRES CU-Boulder and NOAA-PSL, Boulder, CO, United States
Examining the Causality between Stratospheric Planetary Wave Activity and North American Cold Extremes (1126118)
Xiuyuan Ding1, Gang Chen1 and Pengfei Zhang2, (1)University of California Los Angeles, Department of Atmospheric and Oceanic Sciences, Los Angeles, CA, United States, (2)Pennsylvania State University, Department of Meteorology and Atmospheric Science, University Park, United States
An energetical analysis on wintertime meridional teleconnections over the North Pacific (1139669)
Yu Kosaka1, Ryo Satoh2, Syunsuke Nawa2, Hisashi Nakamura2, Ayumu Miyamoto2 and Satoru Okajima1, (1)University of Tokyo, Research Center for Advanced Science and Technology, Bunkyo-ku, Japan, (2)University of Tokyo, Research Center for Advanced Science and Technology, Tokyo, Japan
On the Role of Midlatitude Diabatic Heating in Governing Jet Regimes (1151731)
Ian White, Tel Aviv University, Tel Aviv, Israel, Nili Harnik, Tel-Aviv University, Tel Aviv, Israel and Orli Lachmy, The Open University of Israel, Natural Sciences, Raanana, Israel
The Role of Baroclinic Activity in Controlling Earth's Albedo in the Present and Future Climates (1154925)
Or Hadas1, George Datseris2, Joaquin Blanco3, Sandrine Bony4, Rodrigo Caballero3, Bjorn B Stevens2 and Yohai Kaspi1, (1)Weizmann Institute of Science, Rehovot, Israel, (2)Max Planck Institute for Meteorology, Hamburg, Germany, (3)Stockholm University, Stockholm, Sweden, (4)Laboratoire de Météorologie Dynamique, Paris, France
Understanding Blocking Events with Transition Path Theory (1161697)
Huan Zhang, Courant Institute of Mathematical Sciences, NEW YORK, NY, United States, Justin Moshe Finkel, The University of Chicago, Chicago, United States, Edwin Gerber, New York University, New York, United States, Dorian S Abbot, University of Chicago, Department of the Geophysical Sciences, Chicago, IL, United States and Jonathan Weare, New York University, Courant Institute of Mathematical Sciences, New York, United States
Deciphering the climate effects of autumn-winter Tibetan Plateau snow cover: distinct role of snow albedo versus water equivalent changes (1162808)
Shizuo Liu, Duke University, Division of Earth & Climate Sciences at the Nicholas School of the Environment, Durham, United States, Qigang Wu, Fudan University, Department of Atmospheric and Oceanic Sciences, Shanghai, China and Shineng Hu, Duke University, Division of Earth and Climate Sciences, Nicholas School of the Environment, Durham, NC, United States
Coupled stratosphere-troposphere-Atlantic multidecadal oscillation and its importance for near-future climate projection (1176530)
Nour-Eddine Omrani, University of Bergen, Geophysical Institute, Bergen, Norway, Noel S Keenlyside, Geophysical Institute, Juneau, Norway, Katja Matthes, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, Lina Boljka, Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway, Davide Zanchettin, Università Ca'Foscari, Venice, Italy, Johann Jungclaus, Max Planck Institute for Meteorology, Hamburg, Germany and Sandro Lubis, Pacific Northwest National Laboratory, Richland, United States
Strongest Covariance Between Wintertime Troposphere and Stratosphere Occurs at No Time Lag (1196468)
Kara Hartig, Harvard University, Cambridge, MA, United States and Eli Tziperman, Harvard University, Cambridge, MA, USA., Cambridge, United States
