1. Isotopic evidences for provenance of East Asian Dust Yang et al., 2009,Atmospheric Environment October, 3013 Arash Sharifi

2. 147 Sm 143 Nd  decay Background T 1/2 = 1.06x10 11 yr T 1/2 = 4.8x10 10 yr 87 Rb 87 Sr  decay Extremely long half lives In shorter time scales they considered as conservative fingerprints

3. Background Isotopic compositions of Mantle-derived rocks are different from that of Crustal-derived. Logically aerosols originated from these sources should have distinctive signatures. ε Nd (o) = [( 143 ND/ 144 Nd/0.512638)-1]x 10 4 Grosset and Biscaya (Chem.Geo.), 2005

4. Background (Controlling Factors) Grain Size Effect Sr-isotopes where high grain-size dependency. Nd-isotopes has low or no grain-size dependency. Feng et al.(Geochem. J.), 2009

5. Background (Controlling Factors) Secondary Calcite ● Formed mostly during pedogenesis ● High content of strontium ● Low 87 Sr/ 86 Sr ratios ● Content in sample affected by chemical weathering

6. East Asian Dust C B A2 A1 Fig.2

7. Dust over Pacific and Greenland Fig.4 Fig.3 C B A2 A1 North-Central Pacific Sediments Greenland Ice Core

8. Dust over Japan and China Fig.6 Fig.5 C B A2 A1 Red Snow Strong Storm Dusts Aerosol JAPAN CHINA MONGOLIA Beijing 2006 Floating Dust Bedrock

9. Questions ● What mechanism(s) is/are responsible for shift between dust sources in modern records? ● Can the same shift be detected in regional paleodust records?