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Stratospheric Impact of Varying Sea Surface TemperaturesThe Finite-Volume General Circulation Model (FVGCM) has been run in 50 year simulations with the: 1) 1949-1999 Hadley Centre sea surface temperatures (SST), and 2) a fixed annual cycle of SSTs. In this presentation we first show that the 1949-1999 FVGCM simulation produces a very credible stratosphere in comparison to an NCEP/NCAR reanalysis climatology. In particular, the northern hemisphere has numerous major and minor stratospheric warming, while the southern hemisphere has only a few over the 50-year simulation. During the northern hemisphere winter, temperatures are both warmer in the lower stratosphere and the polar vortex is weaker than is found in the mid-winter southern hemisphere. Mean temperature differences in the lower stratosphere are shown to be small (less than 2 K), and planetary wave forcing is found to be very consistent with the climatology. We then will show the differences between our varying SST simulation and the fixed SST simulation in both the dynamics and in two parameterized trace gases (ozone and methane). In general, differences are found to be small, with subtle changes in planetary wave forcing that lead to reduced temperatures in the SH and increased temperatures in the NH.
Document ID
20040161514
Document Type
Conference Paper
Authors
Newman, Paul A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nash, Eric R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nielsen, Jon E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Waugh, Darryn
(Johns Hopkins Univ.)
Pawson, Steven
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: SPARC 3rd General Assembly
Location: Victoria
Country: Canada
Start Date: July 31, 2004
End Date: August 6, 2004
Sponsors: Environmental Research Inst. of Michigan
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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