Figure 3.

The Pb isotope time series in Singapore aerosols (grey filled diamonds) and seawater (squares). The seawater samples were taken from the Singapore Strait near either Hantu (black filled squares) or Kusu (open squares). The dashed line illustrates an average ²⁰⁶Pb/²⁰⁷Pb ratio in Singapore Strait water. The aerosol samples were taken on top of the S16 building and CREATE building. The light band illustrates the regional aerosols [30] and the dark band illustrates the seawater feeding to the Singapore Strait [29,31].