Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018
A major Stratospheric Sudden Warming (SSW) occurred on 11 February 2018. This was the first major SSW since January 2013 and the first split-vortex SSW since January 2009. We examine the SSW and the tropospheric connections using the NASA MERRA-2 reanalysis (1980-2018) and the NASA GEOS Forward Proc...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20190000856 2023-05-15T17:34:44+02:00 Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018 Pawson, S. Coy, L. Wargan, K. Unclassified, Unlimited, Publicly available January 6, 2019 application/pdf http://hdl.handle.net/2060/20190000856 unknown Document ID: 20190000856 http://hdl.handle.net/2060/20190000856 Copyright, Public use permitted CASI Geosciences (General) GSFC-E-DAA-TN64719 American Meteorological Society (AMS) Annual Meeting; 6-10 Jan. 2019; Phoenix, AZ; United States 2019 ftnasantrs 2019-07-20T23:06:04Z A major Stratospheric Sudden Warming (SSW) occurred on 11 February 2018. This was the first major SSW since January 2013 and the first split-vortex SSW since January 2009. We examine the SSW and the tropospheric connections using the NASA MERRA-2 reanalysis (1980-2018) and the NASA GEOS Forward Processing (FP) system. A strong tropospheric wave forcing event in January 2018 displaced the stratospheric vortex off the pole. This displaced vortex persisted until the major SSW vortex split in February. At the time of the major SSW split vortex event the MERRA-2 100 hPa meridional heat flux, a measure of the tropospheric forcing on the stratosphere, attained record high values, associated with a strong tropospheric ridge over the US west coast and wave disturbances over the North Atlantic and Asia. The near-real-time GEOS-FP system forecasted the major SSW event with high skill out to 10 days. The analyses also show that after, the SSW, a steady circulation anomaly persisted over the European sector and the transient weather systems were concentrated over the North American continent, under the stronger of the two split vortices. The propagation of these synoptic-scale vortices around the deep, quasi-stationary vortex that extended from the surface into the stratosphere, is well illustrated in animations of extreme temperature changes near the surface over North America. A quantitative analysis of these synoptic waves and their propagation will examine their signatures in potential vorticity and other fields. Other/Unknown Material North Atlantic NASA Technical Reports Server (NTRS) Merra ENVELOPE(12.615,12.615,65.816,65.816) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Geosciences (General) |
spellingShingle |
Geosciences (General) Pawson, S. Coy, L. Wargan, K. Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018 |
topic_facet |
Geosciences (General) |
description |
A major Stratospheric Sudden Warming (SSW) occurred on 11 February 2018. This was the first major SSW since January 2013 and the first split-vortex SSW since January 2009. We examine the SSW and the tropospheric connections using the NASA MERRA-2 reanalysis (1980-2018) and the NASA GEOS Forward Processing (FP) system. A strong tropospheric wave forcing event in January 2018 displaced the stratospheric vortex off the pole. This displaced vortex persisted until the major SSW vortex split in February. At the time of the major SSW split vortex event the MERRA-2 100 hPa meridional heat flux, a measure of the tropospheric forcing on the stratosphere, attained record high values, associated with a strong tropospheric ridge over the US west coast and wave disturbances over the North Atlantic and Asia. The near-real-time GEOS-FP system forecasted the major SSW event with high skill out to 10 days. The analyses also show that after, the SSW, a steady circulation anomaly persisted over the European sector and the transient weather systems were concentrated over the North American continent, under the stronger of the two split vortices. The propagation of these synoptic-scale vortices around the deep, quasi-stationary vortex that extended from the surface into the stratosphere, is well illustrated in animations of extreme temperature changes near the surface over North America. A quantitative analysis of these synoptic waves and their propagation will examine their signatures in potential vorticity and other fields. |
format |
Other/Unknown Material |
author |
Pawson, S. Coy, L. Wargan, K. |
author_facet |
Pawson, S. Coy, L. Wargan, K. |
author_sort |
Pawson, S. |
title |
Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018 |
title_short |
Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018 |
title_full |
Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018 |
title_fullStr |
Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018 |
title_full_unstemmed |
Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018 |
title_sort |
connections between the stratosphere and surface weather associated with the stratospheric sudden warming in early 2018 |
publishDate |
2019 |
url |
http://hdl.handle.net/2060/20190000856 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Merra |
geographic_facet |
Merra |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
CASI |
op_relation |
Document ID: 20190000856 http://hdl.handle.net/2060/20190000856 |
op_rights |
Copyright, Public use permitted |
_version_ |
1766133663170297856 |