The Seasonality of the Great Plains Low-Level Jet and ENSO Relationship

Author(s): Krishnamurthy, Lakshmi; Vecchi, Gabriel A; Msadek, Rym; Wittenberg, Andrew; Delworth, Thomas L; et al

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 Abstract: This study investigates the seasonality of the relationship between the Great Plains low-level jet (GPLLJ) and the Pacific Ocean from spring to summer, using observational analysis and coupled model experiments. The observed GPLLJ and El Niño–Southern Oscillation (ENSO) relation undergoes seasonal changes with a stronger GPLLJ associated with La Niña in boreal spring and El Niño in boreal summer. The ability of the GFDL Forecast-Oriented Low Ocean Resolution (FLOR) global coupled climate model, which has the high-resolution atmospheric and land components, to simulate the observed seasonality in the GPLLJ–ENSO relationship is assessed. The importance of simulating the magnitude and phase locking of ENSO accurately in order to better simulate its seasonal teleconnections with the Intra-Americas Sea (IAS) is demonstrated. This study explores the mechanisms for seasonal changes in the GPLLJ–ENSO relation in model and observations. It is hypothesized that ENSO affects the GPLLJ variability through the Caribbean low-level jet (CLLJ) during the summer and spring seasons. These results suggest that climate models with improved ENSO variability would advance our ability to simulate and predict seasonal variations of the GPLLJ and their associated impacts on the United States. Publication Date: 1-Jun-2015 Citation: Krishnamurthy, Lakshmi, Gabriel A. Vecchi, Rym Msadek, Andrew Wittenberg, Thomas L. Delworth, and Fanrong Zeng. "The seasonality of the Great Plains low-level jet and ENSO relationship." Journal of Climate 28, no. 11 (2015): 4525-4544. doi:10.1175/JCLI-D-14-00590.1. DOI: doi:10.1175/JCLI-D-14-00590.1 ISSN: 0894-8755 EISSN: 1520-0442 Pages: 4525 - 4544 Type of Material: Journal Article Journal/Proceeding Title: Journal of Climate Version: Final published version. Article is made available in OAR by the publisher's permission or policy.