  Rossby waves play a fundamental role in angular momentum processes in
rotating fluids. In addition to the potential to shed light on physical
mechanisms operating in the solar convection zone, the recent detection of
Rossby waves in the Sun (L\"optien et al. 2018; Liang et al. 2018) also serves
as a means of comparison between different helioseismic methods. Time-distance
helioseismology, ring-diagram analysis and other techniques have all proven
successful in recovering the Rossby-wave dispersion relation from analyses of
Helioseismic and Magnetic Imager data (HMI; Schou et al. 2012). In this
article, we demonstrate that analyses of two years of HMI
global-mode-oscillation data using the technique of normal-mode coupling also
show signatures of Rossby waves. In addition to providing an independent means
of inferring Rossby waves, this detection lends credence to the methodology of
mode coupling and encourages a more complete exploration of its possibilities.
