The study by Ding and Wang (2005) investigates the circumglobal teleconnection (CGT) pattern in the Northern Hemisphere summer, using 56 years of NCEP-NCAR reanalysis data. The CGT, a second leading empirical orthogonal function of interannual variability in the upper tropospheric circulation, is characterized by a zonal wavenumber-5 structure and is primarily confined within a waveguide associated with the westerly jet stream. The CGT exhibits significant correlations with the Indian summer monsoon (ISM) and El Niño–Southern Oscillation (ENSO), but its relationship with the Arctic Oscillation (AO) and the western North Pacific summer monsoon (WNPSM) is weak. The CGT is associated with significant rainfall and surface temperature anomalies in western Europe, European Russia, India, East Asia, and North America. The study suggests that the ISM acts as a "conductor" connecting the CGT and ENSO, and that the CGT may be influenced by the ISM and ENSO through a complex interaction. The CGT's variability is influenced by the midlatitude westerly jets and the ISM, with the latter playing a crucial role in generating the teleconnection pattern. The CGT is not significantly correlated with the AO or the WNPSM, indicating its independence from these modes of variability. The study also explores the physical mechanisms behind the CGT, including the waveguide effect and the role of internal dynamics in the basic state.The study by Ding and Wang (2005) investigates the circumglobal teleconnection (CGT) pattern in the Northern Hemisphere summer, using 56 years of NCEP-NCAR reanalysis data. The CGT, a second leading empirical orthogonal function of interannual variability in the upper tropospheric circulation, is characterized by a zonal wavenumber-5 structure and is primarily confined within a waveguide associated with the westerly jet stream. The CGT exhibits significant correlations with the Indian summer monsoon (ISM) and El Niño–Southern Oscillation (ENSO), but its relationship with the Arctic Oscillation (AO) and the western North Pacific summer monsoon (WNPSM) is weak. The CGT is associated with significant rainfall and surface temperature anomalies in western Europe, European Russia, India, East Asia, and North America. The study suggests that the ISM acts as a "conductor" connecting the CGT and ENSO, and that the CGT may be influenced by the ISM and ENSO through a complex interaction. The CGT's variability is influenced by the midlatitude westerly jets and the ISM, with the latter playing a crucial role in generating the teleconnection pattern. The CGT is not significantly correlated with the AO or the WNPSM, indicating its independence from these modes of variability. The study also explores the physical mechanisms behind the CGT, including the waveguide effect and the role of internal dynamics in the basic state.