Abstract
Abstract The atmospheric dynamical processes associated with intraseasonal length-of-day (LOD) variability during the austral winter are examined with National Centers for Environmental Prediction–National Center for Atmospheric Research reanalysis and outgoing longwave radiation (OLR) data. The method adopted is to regress the relevant fields against the LOD tendency. All quantities in this study are bandpassed through a 30–70-day filter. The findings from an analysis of the OLR and 200-mb eddy streamfunction fields are consistent with the idea that large intraseasonal LOD fluctuations coincide with an active Madden–Julian oscillation (MJO). Further analysis suggests that the eddy response to the MJO heating drives both an anomalous meridional circulation that excites the anomalous global friction torque, and an eddy field that has the appropriate location relative to the topography for generating the anomalous global mountain torque. These results were obtained by calculating regressions of the anomalou...
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