Aerosol lead (Pb) and Pb isotopes from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018

Dr. Chris Marsay collected shipboard aerosol samples during the U.S. GEOTRACES GP15 Pacific Meridional Transect cruise on R/V Revelle from October to November 2018 and provided subsamples to Massachusetts Institute of Technology (MIT) for lead (Pb) and Pb isotope analyses. These were carried out by undergraduate student Avery Wang and Research Scientist Jahander Ramezani. The north-south transect shows large Pb concentration and Pb isotope changes. The Pb concentration variability is very similar to the Pb concentrations measured independently by Dr. Marsay. The Pb isotope ratios show a strong Chinese signature in the northern portion of the transect, and ratios more similar to American and Australian signatures further south.Chris Marsay博士于2018年10月至11月期间，搭乘R/V Revelle号研究船，参与美国GEOTRACES计划GP15太平洋经向断面巡航航次，采集了船载气溶胶样品，并将分样提交至麻省理工学院（Massachusetts Institute of Technology, MIT），开展铅（Pb）及铅同位素分析工作。该分析工作由本科生Avery Wang与研究科学家Jahander Ramezani完成。该南北向断面呈现出显著的铅浓度与铅同位素组成变化。本次测得的铅浓度变化趋势，与Marsay博士独立测得的铅浓度结果高度一致。铅同位素比值在断面北部区域呈现出显著的中国来源特征，而在更南部区域则更接近美国与澳大利亚的同位素特征。