Short-Term Solar Modulation of the Madden-Julian Climate Oscillation
Author
Hood, Lon L.Affiliation
Univ Arizona, Lunar & Planetary LabIssue Date
2018-03
Metadata
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AMER METEOROLOGICAL SOCCitation
Hood, L.L., 2018: Short-Term Solar Modulation of the Madden–Julian Climate Oscillation. J. Atmos. Sci., 75, 857–873, https://doi.org/10.1175/JAS-D-17-0265.1Rights
© 2018 American Meteorological Society.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Normalized occurrence rates of daily Madden-Julian oscillation (MJO) events are calculated as a function of phase lag relative to peaks and minima in solar ultraviolet flux occurring on the solar rotational time scale (similar to 27 days). All MJO phases and four solar maximum periods are considered (1979-83, 1989-93, 1999-2003, and 2011-15). Corresponding daily static stabilities in the tropical lower stratosphere (70-100 hPa) are calculated from ERA-Interim data and are averaged over the warm pool region. The statistical significance of occurrence-rate changes following UV peaks and minima is assessed using a Monte Carlo method. When MJO events with amplitudes greater than about 2 are considered during the December-May period (about 15% of those days), significant reductions of MJO occurrence rates and associated increases in static stability in the tropical lower stratosphere are obtained 1-7 days following solar UV peaks. Consistently, cross-correlation analyses of high-pass-filtered daily MJO amplitudes and solar UV flux during the same seasonal period produce significant negative correlations near and following solar UV peaks. Conversely, mean occurrence rates are increased and lower-stratospheric static stabilities are decreased following solar UV minima. The reductions (increases) in occurrence rate following solar UV peaks (minima) are largest when the stratospheric quasi-biennial oscillation is in its easterly phase. Little or no dependence of the solar modulation on the phase of El Nino-Southern Oscillation is obtained.Note
6 month embargo; published online: 6 March 2018ISSN
0022-4928Version
Final published versionSponsors
Climate and Large-Scale Dynamics branch of the National Science Foundation [1643160]Additional Links
https://journals.ametsoc.org/doi/abs/10.1175/JAS-D-17-0265.1ae974a485f413a2113503eed53cd6c53
10.1175/JAS-D-17-0265.1