Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere?
"Warm pool" (WP) El Nino events are characterized by positive sea surface temperature (SST) anomalies in the central equatorial Pacific. During austral spring, WP El Nino events are associated with an enhancement of convective activity in the South Pacific Convergence Zone, provoking a tro...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20110005628 2023-05-15T13:34:40+02:00 Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere? Frith, S. M. Song, I.-S. Oman, L. D. Molod, A. M. Hurwitz, M. M. Newman, P. A. Nielsen, J. E. Unclassified, Unlimited, Publicly available November 2011 application/pdf http://hdl.handle.net/2060/20110005628 unknown Document ID: 20110005628 http://hdl.handle.net/2060/20110005628 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology 2011 ftnasantrs 2018-06-09T22:57:34Z "Warm pool" (WP) El Nino events are characterized by positive sea surface temperature (SST) anomalies in the central equatorial Pacific. During austral spring, WP El Nino events are associated with an enhancement of convective activity in the South Pacific Convergence Zone, provoking a tropospheric planetary wave response and thus increasing planetary wave driving of the Southern Hemisphere stratosphere. These conditions lead to higher polar stratospheric temperatures and to a weaker polar jet during austral summer, as compared with neutral ENSO years. Furthermore, this response is sensitive to the phase of the quasi-biennial oscillation (QBO): a stronger warming is seen in WP El Nino events coincident with the easterly phase of the quasi-biennial oscillation (QBO) as compared with WP El Nino events coincident with a westerly or neutral QBO. The Goddard Earth Observing System (GEOS) chemistry-climate model (CCM) is used to further explore the atmospheric response to ENSO. Time-slice simulations are forced by composited SSTs from observed NP El Nino and neutral ENSO events. The modeled eddy heat flux, temperature and wind responses to WP El Nino events are compared with observations. A new gravity wave drag scheme has been implemented in the GEOS CCM, enabling the model to produce e realistic, internally generated QBO. By repeating the above time-slice simulations with this new model version, the sensitivity of the WP El Nino response to the phase of the quasi-biennial oscillation QBO is estimated. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic Austral Pacific |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Frith, S. M. Song, I.-S. Oman, L. D. Molod, A. M. Hurwitz, M. M. Newman, P. A. Nielsen, J. E. Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere? |
topic_facet |
Meteorology and Climatology |
description |
"Warm pool" (WP) El Nino events are characterized by positive sea surface temperature (SST) anomalies in the central equatorial Pacific. During austral spring, WP El Nino events are associated with an enhancement of convective activity in the South Pacific Convergence Zone, provoking a tropospheric planetary wave response and thus increasing planetary wave driving of the Southern Hemisphere stratosphere. These conditions lead to higher polar stratospheric temperatures and to a weaker polar jet during austral summer, as compared with neutral ENSO years. Furthermore, this response is sensitive to the phase of the quasi-biennial oscillation (QBO): a stronger warming is seen in WP El Nino events coincident with the easterly phase of the quasi-biennial oscillation (QBO) as compared with WP El Nino events coincident with a westerly or neutral QBO. The Goddard Earth Observing System (GEOS) chemistry-climate model (CCM) is used to further explore the atmospheric response to ENSO. Time-slice simulations are forced by composited SSTs from observed NP El Nino and neutral ENSO events. The modeled eddy heat flux, temperature and wind responses to WP El Nino events are compared with observations. A new gravity wave drag scheme has been implemented in the GEOS CCM, enabling the model to produce e realistic, internally generated QBO. By repeating the above time-slice simulations with this new model version, the sensitivity of the WP El Nino response to the phase of the quasi-biennial oscillation QBO is estimated. |
author |
Frith, S. M. Song, I.-S. Oman, L. D. Molod, A. M. Hurwitz, M. M. Newman, P. A. Nielsen, J. E. |
author_facet |
Frith, S. M. Song, I.-S. Oman, L. D. Molod, A. M. Hurwitz, M. M. Newman, P. A. Nielsen, J. E. |
author_sort |
Frith, S. M. |
title |
Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere? |
title_short |
Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere? |
title_full |
Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere? |
title_fullStr |
Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere? |
title_full_unstemmed |
Can the GEOS CCM Simulate the Temperature Response to Warm Pool El Nino Events in the Antarctic Stratosphere? |
title_sort |
can the geos ccm simulate the temperature response to warm pool el nino events in the antarctic stratosphere? |
publishDate |
2011 |
url |
http://hdl.handle.net/2060/20110005628 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic Austral Pacific |
geographic_facet |
Antarctic The Antarctic Austral Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
CASI |
op_relation |
Document ID: 20110005628 http://hdl.handle.net/2060/20110005628 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766055606789079040 |