Fig. 11: Schematic of the physical mechanisms of the downstream climate effects of the NEP MHWs.

a, b Show composite geopotential height anomalies (shading; unit: gpm) and WAF (vectors; unit: m2 s–2) at 300 hPa at 5 and 14 days after the peak of MHWs, respectively. c Shows composite IVT (shading; unit: kg m-1s-1; blue shading) at a lag of 5 days and SSTAs (shading; unit: K; red shading) on the peak day of MHWs, while (d) illustrates the 2 m temperature anomalies (shading; unit: K) in western Europe at a lag of 14 days. Other symbols are indicated in the legend.