Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006
The major stratospheric sudden warming (SSW) of January 2006 is examined using meteorological fields from Goddard Earth Observing System version 4 (GEOS-4) analyses and forecast fields from the Navy Operational Global Atmospheric Prediction System-Advanced Level Physics, High Altitude (NOGAPS-ALPHA)...
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ftdtic:ADA520947 2023-05-15T17:35:39+02:00 Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006 Coy, Lawrence Eckermann, Stephen Hoppel, Karl NAVAL RESEARCH LAB WASHINGTON DC 2009-02 text/html http://www.dtic.mil/docs/citations/ADA520947 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA520947 en eng http://www.dtic.mil/docs/citations/ADA520947 Approved for public release; distribution is unlimited. DTIC Atmospheric Physics *ATMOSPHERE MODELS TROPICAL REGIONS STRATOSPHERE WAVES REPRINTS TROPOSPHERE SSW(STRATOSPHERIC SUDDEN WARMING) WAVE BREAKING PV(POTENTIAL VORTICITY) GEOS-4(GODDARD EARTH OBSERVING SYSTEM VERSION 4) Text 2009 ftdtic 2016-02-23T01:19:10Z The major stratospheric sudden warming (SSW) of January 2006 is examined using meteorological fields from Goddard Earth Observing System version 4 (GEOS-4) analyses and forecast fields from the Navy Operational Global Atmospheric Prediction System-Advanced Level Physics, High Altitude (NOGAPS-ALPHA). The study focuses on the upper tropospheric forcing that led to the major SSW and the vertical structure of the subtropic wave breaking near 10 hPa that moved low tropical values of potential vorticity (PV) to the pole. Results show that an eastward-propagating upper tropospheric ridge over the North Atlantic with its associated cold temperature perturbations (as manifested by high 360-K potential temperature surface perturbations) and large positive local values of meridional heat flux directly forced a change in the stratospheric polar vortex, leading to the stratospheric subtropical wave breaking and warming. Results also show that the anticyclonic development, initiated by the subtropical wave breaking and associated with the poleward advection of the low PV values, occurred over a limited altitude range of approximately 6-10 km. The authors also show that the poleward advection of this localized low-PV anomaly was associated with changes in the Eliassen-Palm (EP) flux from equatorward to poleward, suggesting an important role for Rossby wave reflection in the SSW of January 2006. Similar upper tropospheric forcing and subtropical wave breaking were found to occur prior to the major SSW of January 2003. Published in Journal of the Atmospheric Sciences, v66 p495-507, Feb 2009. Supported in part by NASA. Text North Atlantic Defense Technical Information Center: DTIC Technical Reports database |
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Defense Technical Information Center: DTIC Technical Reports database |
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language |
English |
topic |
Atmospheric Physics *ATMOSPHERE MODELS TROPICAL REGIONS STRATOSPHERE WAVES REPRINTS TROPOSPHERE SSW(STRATOSPHERIC SUDDEN WARMING) WAVE BREAKING PV(POTENTIAL VORTICITY) GEOS-4(GODDARD EARTH OBSERVING SYSTEM VERSION 4) |
spellingShingle |
Atmospheric Physics *ATMOSPHERE MODELS TROPICAL REGIONS STRATOSPHERE WAVES REPRINTS TROPOSPHERE SSW(STRATOSPHERIC SUDDEN WARMING) WAVE BREAKING PV(POTENTIAL VORTICITY) GEOS-4(GODDARD EARTH OBSERVING SYSTEM VERSION 4) Coy, Lawrence Eckermann, Stephen Hoppel, Karl Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006 |
topic_facet |
Atmospheric Physics *ATMOSPHERE MODELS TROPICAL REGIONS STRATOSPHERE WAVES REPRINTS TROPOSPHERE SSW(STRATOSPHERIC SUDDEN WARMING) WAVE BREAKING PV(POTENTIAL VORTICITY) GEOS-4(GODDARD EARTH OBSERVING SYSTEM VERSION 4) |
description |
The major stratospheric sudden warming (SSW) of January 2006 is examined using meteorological fields from Goddard Earth Observing System version 4 (GEOS-4) analyses and forecast fields from the Navy Operational Global Atmospheric Prediction System-Advanced Level Physics, High Altitude (NOGAPS-ALPHA). The study focuses on the upper tropospheric forcing that led to the major SSW and the vertical structure of the subtropic wave breaking near 10 hPa that moved low tropical values of potential vorticity (PV) to the pole. Results show that an eastward-propagating upper tropospheric ridge over the North Atlantic with its associated cold temperature perturbations (as manifested by high 360-K potential temperature surface perturbations) and large positive local values of meridional heat flux directly forced a change in the stratospheric polar vortex, leading to the stratospheric subtropical wave breaking and warming. Results also show that the anticyclonic development, initiated by the subtropical wave breaking and associated with the poleward advection of the low PV values, occurred over a limited altitude range of approximately 6-10 km. The authors also show that the poleward advection of this localized low-PV anomaly was associated with changes in the Eliassen-Palm (EP) flux from equatorward to poleward, suggesting an important role for Rossby wave reflection in the SSW of January 2006. Similar upper tropospheric forcing and subtropical wave breaking were found to occur prior to the major SSW of January 2003. Published in Journal of the Atmospheric Sciences, v66 p495-507, Feb 2009. Supported in part by NASA. |
author2 |
NAVAL RESEARCH LAB WASHINGTON DC |
format |
Text |
author |
Coy, Lawrence Eckermann, Stephen Hoppel, Karl |
author_facet |
Coy, Lawrence Eckermann, Stephen Hoppel, Karl |
author_sort |
Coy, Lawrence |
title |
Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006 |
title_short |
Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006 |
title_full |
Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006 |
title_fullStr |
Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006 |
title_full_unstemmed |
Planetary Wave Breaking and Tropospheric Forcing as Seen in the Stratospheric Sudden Warming of 2006 |
title_sort |
planetary wave breaking and tropospheric forcing as seen in the stratospheric sudden warming of 2006 |
publishDate |
2009 |
url |
http://www.dtic.mil/docs/citations/ADA520947 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA520947 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA520947 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766134877183279104 |