10월 28일(목)
․고생물학 | 고기후학
150 2010 추계지질과학연합학술발표회 초록집
Centennial-scale Asian dust variability during the past 6500 years and its controlling factors
Jaesoo Lim
Surficial Environment and Global Change Department, Geologic Environment Division Korea Institute of Geoscience and Mineral Resources, [email protected]
The dominant forcing factors on past large-scale changes in wind-blown (aeolian) dust in Asia are widely debated due to their multi-role in climate system. Changes in Asian dust activity in the past glacial-interglacial cycles have been attributed to the variations in aridity and winter monsoon strength in the source areas, and their present activity is reported to have strong positive/negative correlations with the surface wind velocity/ the antecedent summer and annual precipitation and soil moisture anomalies. However, their natural variabilities on decadal and centennial time scales and forcing factors have not been well determined. Here, we present a high-resolution record of Asian dust based on the aeolian quartz flux variations in Cheju Island, Korea, during the mid to late Holocene. We found that multi- centennial scale changes in Asian dust are closely linked to the North Atlantic climate changes. We conclude that the dominant forcing factor on the centennial-scale variability of Asian dust during the last 6500 years was probably winter monsoon circulation changes driven by high latitude climate changes.
구두 13-5
