Circumglobal teleconnection (CGT)

200-hPa height anomaly averaged over 35–40°N, 60–70°E (Ding & Wang 2005 index; applied year-round, defined for boreal summer). Not relative to the zonal mean. — Ding & Wang 2005, J. Climate 18, 3483–3505, doi:10.1175/JCLI3473.1