- 1University of Arizona - Lunar and Planetary Laboratory, Department of Planetary Sciences, Tucson, AZ, United States of America (lhood@arizona.edu, cahoopes@arizona.edu)
- 2University of Nebraska - Lincoln, Department of Earth and Atmospheric Sciences, Lincoln, NE, United States of America (choopes2@unl.edu)
- 3NOAA/OAR/National Severe Storms Laboratory, Norman, OK, USA (thomas.galarneau@noaa.gov)
Prior work has shown that the Northern Hemisphere storm tracks are modulated by the tropical Madden-Julian oscillation (MJO) and that the modulation is strongest during the easterly phase of the stratospheric quasi-biennial oscillation (Guo et al., 2017; Wang et al., 2018). Prior work has also identified a ~27-day solar rotational modulation of the MJO and its eastward propagation (Hoopes et al., 2024). Here, lagged composite analyses of storm tracks relative to 97 strong solar UV peaks and 90 strong solar UV minima occurring during the northern cool season over a 66-year period demonstrate a significant weakening and southward shift of the storm tracks, in both the North Pacific and North Atlantic, near and following UV peaks. Evidence is presented supporting the hypothesis that reduced MJO convection in the Indian Ocean region prior to solar UV peaks produces a positive Rossby wave source that results in a cyclonic circulation anomaly in the Northwest Pacific, thereby causing the weakening and southward shift of the storm tracks.
1 Guo, Y., Shinoda, T., Lin, J., and Chang, E. K. M. (2017). Journal of Climate, 30, 4799-4818. https://doi.org/10.1175/1520-0469(2004)061%3C0023:TEOVIJ%3E2.0.CO;2.
2 Wang, J., Kim, H.-M., Chang, E. K. M., & Son, S.-W. (2018), Journal of Geophysical Research: Atmospheres, 123, 3976-3992. https://doi.org/10.1029/2017JD027977
3 Hoopes, C. A., Hood, L.L., & Galarneau, T. J., Jr. (2024). Geophysical Research Letters, 51, e2023GL107701. https://doi.org/10.1029/2023GL107701
How to cite: Hoopes, C. A., Hood, L. L., and Galarneau, Jr., T. J.: Short-Term Solar Influences via the MJO on the Northern Hemisphere Storm Tracks, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-13230, https://doi.org/10.5194/egusphere-egu26-13230, 2026.
