Malherbe, JohanEngelbrecht, FALandman, WA2014-06-172014-06-172014-03Malherbe, J, Engelbrecht, F.A and Landman, W.A. 2013. Response of the Southern Annular Mode to tidal forcing and the bidecadal rainfall cycle over subtropical southern Africa. Journal of Geophysical Research: Atmospheres, vol. 119(5), pp 2032-20492169-897Xhttp://onlinelibrary.wiley.com/doi/10.1002/2013JD021138/pdfhttp://hdl.handle.net/10204/7457Copyright: 2013 John Wiley & Sons Ltd. This is an ABSTRACT ONLY. The definitive version is published in Journal of Geophysical Research: Atmospheres, vol. 119(5), pp 2032-2049Synoptic weather data and rainfall records are used to support previous suggestions that the decadal-scale cycle in certain climate records may be attributed to the modulation in tidal forcing related to the 18.6 year lunar nodal cycle. The Southern Annular Mode (SAM) is shown to be sensitive to tidal forcing on a daily time scale. It is subsequently shown that the late-summer SAM can be predicted by consideration of tidal potential. The seasonal response in the SAM is also reflected in sea surface temperatures. Observed behavior of the atmosphere suggests that changing tidal potential over the lower versus higher latitudinal regions plays a role. The atmospheric response as reflected in the changing SAM affects the daily rainfall variation in certain subtropical parts of southern Africa where rainfall correlates positively with the SAM. The daily rainfall response subsequently accumulates in a bidecadal rainfall cycle, known over southern Africa as the Dyer-Tyson cycle.enSynoptic weather dataGeophysical researchSouthern Annular ModeSAMDyer-Tyson cycleTidal forcingBidecadalLunar tideRainfall cycleClimate variabilityArticleMalherbe, J., Engelbrecht, F., & Landman, W. (2014). Response of the Southern Annular Mode to tidal forcing and the bidecadal rainfall cycle over subtropical southern Africa. http://hdl.handle.net/10204/7457Malherbe, Johan, FA Engelbrecht, and WA Landman "Response of the Southern Annular Mode to tidal forcing and the bidecadal rainfall cycle over subtropical southern Africa." (2014) http://hdl.handle.net/10204/7457Malherbe J, Engelbrecht F, Landman W. Response of the Southern Annular Mode to tidal forcing and the bidecadal rainfall cycle over subtropical southern Africa. 2014; http://hdl.handle.net/10204/7457.TY - Article AU - Malherbe, Johan AU - Engelbrecht, FA AU - Landman, WA AB - Synoptic weather data and rainfall records are used to support previous suggestions that the decadal-scale cycle in certain climate records may be attributed to the modulation in tidal forcing related to the 18.6 year lunar nodal cycle. The Southern Annular Mode (SAM) is shown to be sensitive to tidal forcing on a daily time scale. It is subsequently shown that the late-summer SAM can be predicted by consideration of tidal potential. The seasonal response in the SAM is also reflected in sea surface temperatures. Observed behavior of the atmosphere suggests that changing tidal potential over the lower versus higher latitudinal regions plays a role. The atmospheric response as reflected in the changing SAM affects the daily rainfall variation in certain subtropical parts of southern Africa where rainfall correlates positively with the SAM. The daily rainfall response subsequently accumulates in a bidecadal rainfall cycle, known over southern Africa as the Dyer-Tyson cycle. DA - 2014-03 DB - ResearchSpace DP - CSIR KW - Synoptic weather data KW - Geophysical research KW - Southern Annular Mode KW - SAM KW - Dyer-Tyson cycle KW - Tidal forcing KW - Bidecadal KW - Lunar tide KW - Rainfall cycle KW - Climate variability LK - https://researchspace.csir.co.za PY - 2014 SM - 2169-897X T1 - Response of the Southern Annular Mode to tidal forcing and the bidecadal rainfall cycle over subtropical southern Africa TI - Response of the Southern Annular Mode to tidal forcing and the bidecadal rainfall cycle over subtropical southern Africa UR - http://hdl.handle.net/10204/7457 ER -