我想这个应该会有帮助。

## import matplotlib 
matplotlib as mpl

## Set colormap for the colorbar
cmap = mpl.cm.rainbow

#### Use norm to set you vmax and vmin
norm = mpl.colors.Normalize(vmin=0, vmax=35)

## Pass norm as argument while plotting
strm = ax.streamplot(x=ds["longitude"],y=ds["latitude"], u=ds["u"], v=ds["v"], color=ds.u.values, linewidth=1, cmap='rainbow', density=0.6, norm=norm)

fig.colorbar(strm.lines, label = 'wind speed [m$^2$]', shrink=0.6)