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A composite study of the MJO influence on the surface air temperature and precipitation over the Continental United States

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Abstract

The influence of the MJO on the continental United States (CONUS) surface air temperature (SAT) and precipitation is examined based on 30 years of daily data from 1979–2008. Composites are constructed for each of the eight phases of the Wheeler-Hendon MJO index over 12 overlapping three-month seasons. To ensure that the MJO signal is distinguished from other patterns of climate variability, several steps are taken: (a) only days classified as “MJO events” are used in the composites, (b) statistical significance of associated composites is assessed using a Monte Carlo procedure, and (c) intraseasonal frequencies are matched to the unfiltered data. Composites of other fields are also shown in order to examine how the SAT and precipitation anomalies are associated with large-scale circulations providing a link between the tropics and extratropics. The strongest and most significant MJO effects on SAT are found during the northern winter seasons. When enhanced convection is located over the equatorial Indian Ocean, below-average SAT tends to occur in New England and the Great Lakes region. As enhanced tropical convection shifts over the Maritime continent, above-average SAT appears in the eastern states of the US from Maine to Florida. The MJO influence on precipitation is also significant during northern winter seasons. When enhanced convection is located over the Maritime continent, more precipitation is observed in the central plains of the US. Enhanced precipitation also occurs over the west coast of the US when convective activity is stronger over the Indian Ocean. During the northern summer and fall, the MJO impact on precipitation is mainly significant at lower latitudes, over Mexico and southeastern US.

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Acknowledgments

We thank Jon Gottschalck, Peitao Peng, and Joseph Harrison of the NOAA Climate Prediction Center for helpful discussions, suggestions and assistance. We also thank two anonymous reviewers for their constructive comments and suggestions.

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Authors and Affiliations

  1. NOAA/NWS/NCEP, Camp Springs, MD, 20746, USA

    Shuntai Zhou, Michelle L’Heureux, Scott Weaver & Arun Kumar

  2. Wyle, Inc., McLean, VA, 22102, USA

    Shuntai Zhou

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  1. Shuntai Zhou
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  2. Michelle L’Heureux
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  3. Scott Weaver
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  4. Arun Kumar
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Correspondence to Shuntai Zhou.

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Zhou, S., L’Heureux, M., Weaver, S. et al. A composite study of the MJO influence on the surface air temperature and precipitation over the Continental United States. Clim Dyn 38, 1459–1471 (2012). https://doi.org/10.1007/s00382-011-1001-9

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  • DOI: https://doi.org/10.1007/s00382-011-1001-9

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