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Troposphere-Stratosphere Connections in Recent Northern Winters in NASA GEOS Assimilated DatasetsThe northern winter stratosphere displays a wide range of interannual variability, much of which is believed to result from the response to the damping of upward-propagating waves. However, there is considerable (growing) evidence that the stratospheric state can also impact the tropospheric circulation. This issue will be examined using datasets generated in the Data Assimilation Office (DAO) at NASA's Goddard Space Flight Center. Just as the tropospheric circulation in each of these years was dominated by differing synoptic-scale structures, the stratospheric polar vortex also displayed different evolutions. The two extremes are the winter 1998/1999, when the stratosphere underwent a series of warming events (including two major warmings), and the winter 1999/2000, which was dominated by a persistent, cold polar vortex, often distorted by a dominant blocking pattern in the troposphere. This study will examine several operational and research-level versions of the DAO's systems. The 70-level-TRMM-system with a resolution of 2-by-2.5 degrees and the 48-level, 1-by-l-degree resolution ''Terra'' system were operational in 1998/1999 and 1999/2000, respectively. Research versions of the system used a 48-level, 2-by-2.5-degree configuration, which facilitates studies of the impact of vertical resolution. The study includes checks against independent datasets and error analyses, as well as the main issue of troposphere-stratosphere interactions.
Document ID
20000074253
Document Type
Preprint (Draft being sent to journal)
Authors
Pawson, Steven
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Environment Pollution
Meeting Information
Meeting: Western Pacific Geophysics
Location: Tokyo
Country: Japan
Start Date: June 27, 2000
End Date: June 30, 2000
Funding Number(s)
CONTRACT_GRANT: NAS5-98181
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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