Response of the Antarctic Stratosphere to Two Types of El Nino Events
This study is the first to identify a robust El Nino/Southern Oscillation (ENSO) signal in the Antarctic stratosphere. El Nino events are classified as either conventional "cold tongue" events (positive SST anomalies in the Nino 3 region) or "warm pool" events (positive SST anoma...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20100031214 2023-05-15T13:34:40+02:00 Response of the Antarctic Stratosphere to Two Types of El Nino Events Molod, A. M. Newman, P. A. Oman, L. D. Hurwitz, M. M. Unclassified, Unlimited, Publicly available July 2010 application/pdf http://hdl.handle.net/2060/20100031214 unknown Document ID: 20100031214 http://hdl.handle.net/2060/20100031214 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology 2010 ftnasantrs 2018-06-09T22:57:49Z This study is the first to identify a robust El Nino/Southern Oscillation (ENSO) signal in the Antarctic stratosphere. El Nino events are classified as either conventional "cold tongue" events (positive SST anomalies in the Nino 3 region) or "warm pool" events (positive SST anomalies in the Nino 4 region). The ERA-40, NCEP and MERRA meteorological reanalyses are used to show that the Southern Hemisphere stratosphere responds differently to these two types of El Nino events. Consistent with previous studies, "cold tongue" events do not impact temperatures in the Antarctic stratosphere. During "warm pool" El Nino events, the poleward extension and increased strength of the South Pacific Convergence Zone (SPCZ) favor an enhancement of planetary wave activity during the SON season. On average, these conditions lead to higher polar stratospheric temperatures and a weakening of the Antarctic polar jet in November and December, as compared with neutral ENSO years. The phase of the quasi-biennial oscillation (QBO) modulates the stratospheric response to "warm pool" El Nino events: the strongest planetary wave driving events are coincident with the easterly phase of the QBO. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic Merra ENVELOPE(12.615,12.615,65.816,65.816) Pacific The Antarctic |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Molod, A. M. Newman, P. A. Oman, L. D. Hurwitz, M. M. Response of the Antarctic Stratosphere to Two Types of El Nino Events |
topic_facet |
Meteorology and Climatology |
description |
This study is the first to identify a robust El Nino/Southern Oscillation (ENSO) signal in the Antarctic stratosphere. El Nino events are classified as either conventional "cold tongue" events (positive SST anomalies in the Nino 3 region) or "warm pool" events (positive SST anomalies in the Nino 4 region). The ERA-40, NCEP and MERRA meteorological reanalyses are used to show that the Southern Hemisphere stratosphere responds differently to these two types of El Nino events. Consistent with previous studies, "cold tongue" events do not impact temperatures in the Antarctic stratosphere. During "warm pool" El Nino events, the poleward extension and increased strength of the South Pacific Convergence Zone (SPCZ) favor an enhancement of planetary wave activity during the SON season. On average, these conditions lead to higher polar stratospheric temperatures and a weakening of the Antarctic polar jet in November and December, as compared with neutral ENSO years. The phase of the quasi-biennial oscillation (QBO) modulates the stratospheric response to "warm pool" El Nino events: the strongest planetary wave driving events are coincident with the easterly phase of the QBO. |
author |
Molod, A. M. Newman, P. A. Oman, L. D. Hurwitz, M. M. |
author_facet |
Molod, A. M. Newman, P. A. Oman, L. D. Hurwitz, M. M. |
author_sort |
Molod, A. M. |
title |
Response of the Antarctic Stratosphere to Two Types of El Nino Events |
title_short |
Response of the Antarctic Stratosphere to Two Types of El Nino Events |
title_full |
Response of the Antarctic Stratosphere to Two Types of El Nino Events |
title_fullStr |
Response of the Antarctic Stratosphere to Two Types of El Nino Events |
title_full_unstemmed |
Response of the Antarctic Stratosphere to Two Types of El Nino Events |
title_sort |
response of the antarctic stratosphere to two types of el nino events |
publishDate |
2010 |
url |
http://hdl.handle.net/2060/20100031214 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Antarctic Merra Pacific The Antarctic |
geographic_facet |
Antarctic Merra Pacific The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
CASI |
op_relation |
Document ID: 20100031214 http://hdl.handle.net/2060/20100031214 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766055608856870912 |