Precipitation estimation performance by Global Satellite Mapping and its dependence on wind over northern Vietnam

Progress in Earth and Planetary Science

Table 1 Statistics of wind frequency, precipitation, and its reproducibility by the GSMaP with respect to the VnGP classified into four wind direction categories

Level of the wind	925 hPa			850 hPa
Wind direction (in degrees)	North	East	South	West	North	East	South	West
	(315−−360^∘,	(45−−135^∘)	(135−−225^∘)	(225−−315^∘)	(315−−360^∘,	(45−−135^∘)	(135−−225^∘)	(225−−315^∘)
	0−−45^∘)				0−−45^∘)
Number of days	195	152	509	322	132	165	366	408
Mean daily precipitation (mm day ⁻¹)	7.9	8.7	9.8	8.3	8.2	6.0	10.2	9.5
Contribution to total precipitation (%)	12.8	11.0	41.9	22.4	9.1	8.4	31.5	32.7
GV ratio	0.78	0.58	0.71	1.03	0.80	0.51	0.61	0.91
Number of days for wind speed > 10 m s ⁻¹	27	14	36	27	20	22	15	154

Wind direction range is 90^∘ around the true north, east, south, and west in each category. The statistics basically show only the cases with wind speed less than 10 m s ⁻¹. Days with wind speed greater than 10 m s ⁻¹ are also shown for reference