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Connections Between the Stratosphere and Surface Weather Associated with the Stratospheric Sudden Warming in Early 2018A 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.
Document ID
20190000856
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Pawson, S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Coy, L. (Science Systems and Applications, Inc. Moffett Field, CA, United States)
Wargan, K. (Science Systems and Applications, Inc. Moffett Field, CA, United States)
Date Acquired
February 20, 2019
Publication Date
January 6, 2019
Subject Category
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN64719
Meeting Information
Meeting: American Meteorological Society (AMS) Annual Meeting
Location: Phoenix, AZ
Country: United States
Start Date: January 6, 2019
End Date: January 10, 2019
Sponsors: American Meteorological Society (AMS)
Funding Number(s)
CONTRACT_GRANT: NNG17HP01C
Distribution Limits
Public
Copyright
Public Use Permitted.

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