Fig. 6
Regression of detrended variables onto the detrended SPEI-3 over SE China. a is for horizontal wind (vectors; unit:\({\text{m s}}^{-1}\)) and geopotential height (shading; unit: m) at 700 hPa, b is for vertical integral of specific humidity (contours; unit: kg m−2), and vertical integral of water vapor flux (vectors; unit: kg m-1 s-1) as well as its divergence (shading; unit: \({\text{kg m}}^{{ - 2}} {\text{ s}}^{{ - 1}}\)), c is the same as a except for 200 hPa, and d is for omega (unit: 10–2 Pa s−1) at 500 hPa. Significant values exceeding the 0.1 and 0.05 significance levels are marked by gray and black dots, respectively. Significant zonal or meridional values exceeding the 0.1 and 0.05 significance levels are marked by green and black vectors, respectively. The shading or contour areas of exceeding the 0.1 and 0.05 significance levels are marked by gray and black dots, respectively. Only the vertically-integrated moisture flux convergence exceeding the 0.1 significance level is plotted. The TP region with elevations exceeding 3000 m is shaded gray