Coupling dynamical and statistical downscaling for high-resolution rainfall forecasting: case study of the Red River Delta, Vietnam

Progress in Earth and Planetary Science

Table 2 Predictor variables considered in the preliminary test

No.	Parameter	Description	Unit	Correlation with TG
1	Rd1	Rainfall taken from D1	mm	0.89
2	v10	Vertical wind speed at 10 m	m.s^− 1	0.02
3	u10	Horizontal wind speed at 10 m	m.s⁻¹	0.04
4	hgt	Terrain height	m	0.01
5	t_diff	Temperature different between tk and t2	K	− 0.12
6	slp	Sea level pressure	Pa	0.18
7	tk	Temperature at 1400 m height	K	0.23
8	t2	Temperature at 2 m	K	0.08
9	q2	Specific humidity at 2 m	kg.kg⁻¹	− 0.2
10	psfc	Surface pressure	Pa	0.12
11	vasso	Variance of sub-grid scale orography	m	− 0.04
12	pblh	Planetary boundary layer height	m	− 0.05
13	tslb	Soil temperature	K	− 0.19
14	smois	Soil moisture	m³.m⁻³	0.21
15	grdflx	Ground heat flux	W.m⁻²	0.24
16	canwat	Canopy water	kg.m⁻²	0.14
17	sfroff	Surface runoff	mm	− 0.05