HR: 0830h
AN: A41B-04    [Abstracts]
TI: ENSO, Subseasonal Variability and Extreme Winter Weather Events over the United States
AU: * Chang, Y
EM: ychang@gmao.gsfc.nasa.gov
AF: NASA/GSFC, Code 900.3 NASA/GSFC, Greenblet, MD 20771 United States
AU: Schubert, S
AF: NASA/GSFC, Code 900.3 NASA/GSFC, Greenblet, MD 20771 United States
AU: Suarez, M
AF: NASA/GSFC, Code 900.3 NASA/GSFC, Greenblet, MD 20771 United States
AU: Pegion, P
AF: NASA/GSFC, Code 900.3 NASA/GSFC, Greenblet, MD 20771 United States
AB: The ENSO/weather connection clearly depends on a number of different process that include the large-scale seasonal mean response of atmospheric to tropical Pacific SST anomalies, and potential attendant changes in various subseasonal low frequency variations such as the PNA and blocking. These linkages are complicated by potential nonlinearities that result in the interactions between the various time and space scales. In this study, we force the NSIPP-1 AGCM with observed SST to examine the link between ENSO and extreme precipitation events over the United States. In addition to the link to EL Nino, We also quantify the impact of other subseasonal modes of variability including the PNA and AO on extreme weather throughout the continent. Results from the simulations are compared with observations that are composited according to these atmospheric indices as well as ENSO.
DE: 3309 Climatology (1620)
DE: 3354 Precipitation (1854)
DE: 3399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly