Figure 6: (a) Moisture flux (m/s) at 850 hPa level (about 1.5 km height) supplied by KMA [26] and (b) surface wind (m/s) simulated by WRF model at 09:00 LST, October 27, 2003, and (c) and (d) are at 17:00LST (a maximum PM concentration), respectively. Small square and triangle in (a) and (c) denote Gobi Desert and Gangneung city (Korea). Small square in (b) and (d) denotes the vicinity of Gangneung (the 3rd domain of WRF model) at 09:00 LST, October 27, 2003 and 17:00 LST (occurrence time of maximum PM concentration). D and big arrow denote the eastern part of Gobi Desert in the northwest of Nei-Mongo and a dust transportation route. In (a), (b), (c), and (d), dust particles originated from Gobi Desert moved toward Nei-Mongo under westerly wind at both the surface and 1.5 km height and then, followed northerly and northwesterly toward the Chinese eastern coast and the Yellow Sea, further moving toward the northern Korea and Gangneung city.