Fig. 3: Detrended circulation anomalies regressed on the dipole mode index (DMI) and 30-hPa Quasi-Biennial Oscillation (QBO) index over the period 1995-2019.
From: A stratospheric precursor of East Asian summer droughts and floods
a East Asian zonal wind anomalies (colors, averaged over 70–120°E) regressed on the standardized DMI. b East Asian zonal wind (colors) and Plumb wave flux (vectors) anomalies averaged over 70–120°E regressed on the standardized QBO index. c Zonal mean stream function anomalies (colors) regressed on the standardized QBO index. d Tropical zonal mean stream function anomalies (colors, averaged over 0–15°N) lag-regressed on the standardized QBO index. e The 200-hPa relative vorticity anomalies regressed on the standardized QBO index. f As in (e) but for the meridional term of 200-hPa Rossby wave source (RWS). g The 200-hPa RWS (colors) and Plumb wave flux (vectors) anomalies regressed on the standardized QBO index. h The 200-hPa zonal wind (colors) and geopotential height (contours) anomalies regressed on the standardized QBO index. The units of geopotential height are gpm in (h). NTA, SNA, and SIO indices are the weight-averaged SST anomalies over 0–80°W and 0–20°N, 0–60°W and 55–75°N, and 25–80°E and 35–50°S, respectively. Linear effects from NTA, SNA, and SIO have been removed in the anomalies in (b–h). Dots indicate values at the 95% confidence level according to Student’s t-test.
