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How MJO Teleconnections and ENSO Interference Impacts U.S. Precipitation by Marybeth C. Arcodia; Ben P. Kirtman; Leo S. P. Siqueira is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract A composite analysis reveals how the Madden–Julian oscillation (MJO) impacts North American rainfall through perturbations in both the upper-tropospheric flow and regional low-level moisture availability. Upper-level divergence associated with the MJO tropical convection drives a quasi-stationary Rossby wave response to the midlatitudes. This forces a midlatitude upper-level dipolar geopotential height anomaly that is accompanied by a westward retraction of the jet stream and reduced rainfall over the central-eastern North Pacific. A reverse effect is found as the MJO propagates eastward across the Maritime Continent. These large differences in the extratropical upper-level flow, combined with anomalies in the regional supply of water vapor, have a profound impact on southeastern U.S. rainfall. The low-frequency variability, including that associated with ENSO, can modify the seasonal background flow (e.g., El Niño and La Niña basic states) affecting the distribution, strength, and propagation of the intraseasonal oscillation and the extratropical teleconnection patterns. The combined effects of the ENSO and the MJO signals result in both spatial and temporal patterns o

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Author

Marybeth C. Arcodia; Ben P. Kirtman; Leo S. P. Siqueira

Publisher

American Meteorological Society (ISSN 0894-8755)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)