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contributor authorWilson, Aaron B.
contributor authorBromwich, David H.
contributor authorHines, Keith M.
contributor authorWang, Sheng-hung
date accessioned2017-06-09T17:10:31Z
date available2017-06-09T17:10:31Z
date copyright2014/12/01
date issued2014
identifier issn0894-8755
identifier otherams-80581.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223488
description abstractwo El Niño flavors have been defined based on whether warm sea surface temperature (SST) anomalies are located in the central or eastern tropical Pacific (CP or EP). This study further characterizes the impacts on atmospheric circulation in the high latitudes of the Southern Hemisphere associated with these types of El Niño events though a series of numerical simulations using the National Center for Atmospheric Research Community Atmosphere Model (CAM). Comparing results with the Interim ECMWF Re-Analysis (ERA-Interim), CAM simulates well the known changes to blocking over Australia and a southward shift in the subtropical jet stream across the eastern Pacific basin during CP events. More importantly for the high southern latitudes, CAM simulates a westward shift in upper-level divergence in the tropical Pacific, which causes the Pacific?South American stationary wave pattern to shift toward the west across the entire South Pacific. These changes to the Rossby wave source region impact the South Pacific convergence zone and jet streams and weaken the high-latitude blocking that is typically present in the Amundsen-Bellingshausen Seas during EP events. Anticyclonic flow becomes established farther west in the south central Pacific, modifying high-latitude heat and momentum fluxes across the South Pacific and South Atlantic associated with the ENSO?Antarctic dipole.
publisherAmerican Meteorological Society
titleEl Niño Flavors and Their Simulated Impacts on Atmospheric Circulation in the High Southern Latitudes
typeJournal Paper
journal volume27
journal issue23
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-14-00296.1
journal fristpage8934
journal lastpage8955
treeJournal of Climate:;2014:;volume( 027 ):;issue: 023
contenttypeFulltext


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