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Measurements of total gaseous mercury (TGM) were made over the Arctic Ocean in 2008, 2010 and 2012, which was observed on 3th, 4th and 5th Chinese Arctic Research Expedition (CHINARE).Here we first presented multi-year mercury observation on line and the data from the three cruises were presented.It showed that atmospheric mercury was inhomogeneous distribution and the trend over the Arctic Ocean decreased in the three cruises.TGM measurements on ships provided valuable complementary information compared with the measurements by the ground based on monitoring network.This large-scale distribution provided in-suit information about sources of mercury.In Arctic summer, the Arctic Ocean may be the source of atmospheric mercury but the influence of geographic regions may be more notablely than the month.Runoff discharge contributed higher content of chlorophyll over the Chukchi Sea, which may release more mercury by air-exchange.The relatively higher O3 concentrations (>30ppb) seemed to be contributed to the mercury oxidation in the open sea.The mean concentration of mercury over ice-covered region was higher than the open sea, but a lower concentration over the ice-covered region than the open sea in the 4th August.