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Alfredo Ruiz-Barradas and Sumant Nigam

present (Ruiz-Barradas and Nigam 2009, manuscript submitted to J. Climate ). Several other studies have documented the importance of the SST links of the central U.S. hydroclimate (e.g., Trenberth and Guillemot 1996 ; Ting and Wang 1997 ; Barlow et al. 2001 ; Schubert et al. 2004 ). The main goal of the current study is to document, and to assess, the capabilities of the DWG atmospheric models in simulating low-frequency summer precipitation variability over North America from century

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Kerry H. Cook and Edward K. Vizy

work to further our understanding of the dynamics of the climatological CLLJ, including how the jet’s variations are controlled on seasonal and diurnal time scales. In addition, the relationship between the CLLJ and rainfall is examined, with special attention to any connections between the jet and regional drought. Current literature on the CLLJ is reviewed in the following section, illustrated with figures from the North American Regional Reanalysis (NARR; Mesinger et al. 2006 ), which also

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Kingtse C. Mo, Jae-Kyung E. Schemm, and Soo-Hyun Yoo

streamflow in winter. Different phases of the AMO also link to different summer precipitation modes of the North American monsoon ( Hu and Feng 2008 ). With the progress of climate modeling, current climate models in general are able to predict ENSO relatively well ( Saha et al. 2006 ). Responses to SSTAs in the Atlantic simulated by atmospheric GCMs (AGCMs) are more diverse. In the review paper by Kushnir et al. (2002) , the authors stated that the atmosphere indeed responds to the SSTAs in the

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Siegfried Schubert, David Gutzler, Hailan Wang, Aiguo Dai, Tom Delworth, Clara Deser, Kirsten Findell, Rong Fu, Wayne Higgins, Martin Hoerling, Ben Kirtman, Randal Koster, Arun Kumar, David Legler, Dennis Lettenmaier, Bradfield Lyon, Victor Magana, Kingtse Mo, Sumant Nigam, Philip Pegion, Adam Phillips, Roger Pulwarty, David Rind, Alfredo Ruiz-Barradas, Jae Schemm, Richard Seager, Ronald Stewart, Max Suarez, Jozef Syktus, Mingfang Ting, Chunzai Wang, Scott Weaver, and Ning Zeng

uncertainties in the extratropical response to SST anomalies. The results of this initial analysis of the model experiments serve to highlight and quantify the important role of SST anomalies (especially those in the Pacific) in generating drought and pluvial conditions over the United States. The differences between the model results provide an assessment of the current uncertainties in our ability to model the global response to SST forcing (including the feedbacks associated with land

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