Geoscience Reference
In-Depth Information
A NUMERICAL SIMULATION OF AN ASIAN DUST
(HWANGSA) EVENT OBSERVED IN KOREA ON MARCH
10-12, 2004 USING THE MODIFIED ADAM MODEL
EUN-HEE LEE
∗
and SOON-UNG PARK
School of Earth and Environmental Sciences Seoul National University
Seoul 151-742, Korea
∗
s94leh@snu.ac.kr
A moderate Asian dust (Hwangsa) event was observed in Korea for the period
of March 10-12, 2004. This event has been simulated using MM5 and the mod-
ified Asian Dust Aerosol Model (ADAM2). The ADAM model developed by
Park and In and Park and Lee has been modified using the observed data
obtained from the monitoring tower located at Duolun in Inner Mongolia. The
modification has been done by comparing modeled and monitored meteoro-
logical parameters including the relative humidity, soil surface temperature,
surface wind speed and the surface vegetation conditions that are used in dust
emission conditions in the ADAM model. The ADAM2 is able to simulate
more accurately the start, end and the dust peak times and dust concentra-
tions observed in South Korea. As a result, the ADAM2 model is a useful tool
to forecast the Asian dust (Hwangsa) event in Korea.
1. Introduction
Asian dust which is called “Hwangsa” in Korea and “Kosa” in Japan is
a typical example of mineral aerosol frequently originating in the Gobi
desert, Sand desert, Loess plateau, and barren mixed soil in northern China
and Mongolia during the spring season.
1
-
3
The occurrence of large dust
storms is often associated with catastrophic consequences for humans and
their environment. Indeed, very severe dust storms were observed in Korea
on March 21-23 and April 7-9, 2002 with an observed maximum PM
10
concentration greater than 1500
µ
g
/
m
3
at most monitoring sites in South
Korea.
2
These intense dust storms have caused natural disasters in Korea.
The consequence of these severe events has given birth to the Asian Dust
Aerosol Model (ADAM) in Korea in order to issue warnings to the public.
Park and In
1
and Park and Lee
2
have used this model to simulate the severe
dust-storm events occurring on March 21-23, 2002 and April 7-9, 2002 with
successful results. However, the ADAM model tends to overestimate the
observed dust concentrations in Korea for recently observed dust events.
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