Statistical Downscaling of ERA-Interim Forecast Precipitation Data in Complex Terrain Using LASSO Algorithm

Table 5

Comparison of observations with downscaled daily precipitation for the four downscaling methods, as well as the original ERA-Interim data in precipitation amount (mm) on wet days for the validation period 1999–2010.

Site	RMSE					MAE
	ERA	LOCI	QM	Stepwise	LASSO	ERA	LOCI	QM	Stepwise	LASSO
COV	4.53	4.14	4.31	3.87	3.87	2.33	1.76	1.83	1.80	1.78
WFJ	6.12	6.29	6.45	5.47	5.46	3.03	2.89	2.95	2.71	2.68
SAE	11.89	11.09	11.26	9.74	9.75	5.56	5.49	5.58	5.01	5.01
GSB	11.20	10.59	10.65	9.18	9.18	4.61	4.72	4.78	4.49	4.48
GUE	6.50	6.38	6.79	5.85	5.85	3.16	2.84	2.91	2.95	2.94
PIL	10.42	10.04	9.90	9.57	9.56	4.30	4.21	4.18	4.23	4.20
MLS	5.85	5.28	5.65	4.67	4.66	3.02	2.41	2.50	2.37	2.34
SAM	4.73	3.90	4.05	3.60	3.60	2.58	1.46	1.54	1.55	1.53
DOL	5.71	5.92	6.02	5.40	5.39	2.63	2.64	2.70	2.72	2.70
CIM	8.79	9.46	9.56	8.09	8.09	3.48	3.46	3.52	3.52	3.52
SBE	9.27	9.08	9.91	7.51	7.50	3.98	3.76	3.98	3.52	3.51
ZER	5.10	4.16	4.50	3.65	3.65	2.55	1.61	1.65	1.64	1.62
CHA	5.50	5.61	5.77	5.52	5.52	2.62	2.47	2.52	2.60	2.58
DAV	5.18	4.82	4.89	4.44	4.45	2.72	2.11	2.15	2.09	2.07
MVE	5.32	4.86	4.97	4.21	4.21	2.72	2.08	2.11	2.14	2.13
NAP	6.15	6.47	6.50	6.10	6.10	2.97	2.98	3.00	2.95	2.94
ULR	6.23	5.92	6.21	5.68	5.71	3.11	2.52	2.60	2.70	2.69
SCU	4.93	3.72	3.98	3.55	3.55	2.72	1.46	1.54	1.57	1.54
FRE	5.15	5.43	5.56	4.91	4.91	2.46	2.30	2.34	2.26	2.25
DIS	5.97	5.33	5.49	5.29	5.29	3.00	2.18	2.20	2.37	2.36
ROB	5.72	6.14	6.24	5.09	5.08	2.66	2.40	2.47	2.37	2.36
ENG	6.16	6.64	6.41	5.79	5.79	3.13	3.17	3.10	2.93	2.90
CDF	5.01	5.44	5.44	4.89	4.89	2.34	2.37	2.40	2.36	2.33
PIO	7.88	7.72	7.98	6.76	6.77	3.54	2.99	3.09	3.16	3.16
STG	5.67	5.81	5.92	5.55	5.53	2.76	2.54	2.58	2.60	2.57
VIS	5.49	4.12	4.53	3.75	3.75	2.92	1.52	1.60	1.62	1.61
RUE	4.62	4.57	4.68	4.15	4.15	2.40	1.98	2.03	2.00	1.98
FAH	4.67	4.69	4.78	4.44	4.45	2.28	1.99	2.04	2.05	2.02
INT	5.21	5.30	5.34	4.82	4.81	2.71	2.33	2.35	2.33	2.32
CHU	5.19	4.48	4.82	4.20	4.21	2.80	1.88	1.96	1.91	1.90
SMA	4.86	4.95	5.14	4.71	4.72	2.44	2.17	2.23	2.18	2.16
BER	5.14	5.16	5.23	4.68	4.68	2.64	2.15	2.20	2.18	2.16
TAE	4.74	4.80	4.97	4.51	4.51	2.54	2.24	2.30	2.28	2.26
GLA	5.60	6.02	6.05	5.29	5.29	2.87	2.80	2.82	2.65	2.64
PAY	5.30	4.51	4.60	3.96	3.97	2.83	1.86	1.92	1.90	1.88
WAE	5.50	5.96	6.05	5.40	5.40	2.74	2.67	2.71	2.67	2.64
NEU	5.00	4.85	4.90	4.34	4.34	2.60	1.95	2.00	1.97	1.94
SIO	4.98	3.52	3.65	3.09	3.08	2.74	1.37	1.43	1.48	1.46
VAD	5.26	4.61	4.83	4.38	4.38	2.72	1.87	1.94	1.91	1.90
PUY	5.58	5.57	5.76	5.06	5.06	2.76	2.28	2.36	2.44	2.43
CGI	4.95	4.50	4.69	4.14	4.15	2.55	1.83	1.90	1.86	1.85
LUZ	5.40	5.48	5.52	5.21	5.21	2.81	2.45	2.48	2.55	2.52
REH	4.91	4.82	4.88	4.54	4.55	2.46	2.04	2.07	2.04	2.03
GUT	4.84	4.34	4.56	3.96	3.97	2.60	1.91	1.98	1.91	1.89
SHA	4.36	4.25	4.34	3.90	3.90	2.31	1.85	1.88	1.83	1.80
ALT	5.47	5.47	5.57	5.23	5.23	2.80	2.39	2.44	2.40	2.37
KLO	4.90	4.83	4.97	4.62	4.63	2.51	2.07	2.11	2.07	2.05
WYN	4.87	5.23	5.31	4.60	4.60	2.46	2.21	2.24	2.19	2.17
GVE	5.13	4.72	4.90	4.53	4.53	2.61	1.87	1.96	1.93	1.93
AIG	4.69	4.55	4.65	4.02	4.02	2.43	1.91	1.97	1.99	1.97
Average	5.83	5.63	5.78	5.12	5.12	2.87	2.41	2.46	2.42	2.40