contributor author | Lin, Pu | |
contributor author | Fu, Qiang | |
contributor author | Hartmann, Dennis L. | |
date accessioned | 2017-06-09T17:04:52Z | |
date available | 2017-06-09T17:04:52Z | |
date copyright | 2012/07/01 | |
date issued | 2012 | |
identifier issn | 0894-8755 | |
identifier other | ams-79078.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4221818 | |
description abstract | he impact of tropical sea surface temperature (SST) on stratospheric planetary waves in the Southern Hemisphere (SH) is investigated in austral spring using observed SST and reanalysis data for the past three decades. Maximum covariance analysis indicates that the tropical SST and the SH stratospheric planetary wave activity are primarily coupled through two modes. The leading two modes show the La Niña?like and the central-Pacific El Niño?like SST anomalies in their positive polarities, respectively, which each are related to enhanced stratospheric planetary wave activity. These two modes also introduce phase shifts to the stratospheric stationary planetary waves: a westward shift is seen for La Niña and an eastward shift for warm SST anomalies is seen in the central Pacific. The Eliassen?Palm fluxes associated with the two modes indicate that the anomalous stratospheric wave activity originates in the troposphere and propagates upward over the mid?high latitudes, so that the linkages between tropical SST and extratropical tropospheric circulation appear to play a key role. Furthermore, the observed circulation anomaly patterns for the two modes change rapidly from spring to summer, consistent with a sharp seasonal transition in the SH basic state. Similar SST and circulation anomaly patterns associated with the two modes are simulated in chemistry?climate models. | |
publisher | American Meteorological Society | |
title | Impact of Tropical SST on Stratospheric Planetary Waves in the Southern Hemisphere | |
type | Journal Paper | |
journal volume | 25 | |
journal issue | 14 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-11-00378.1 | |
journal fristpage | 5030 | |
journal lastpage | 5046 | |
tree | Journal of Climate:;2012:;volume( 025 ):;issue: 014 | |
contenttype | Fulltext | |