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Abstract Title: Atmospheric Gaseous Elemental Mercury and its Evasion Fluxes from the Sea of Okhotsk to the South China Sea in 2019
Presenter Name: Vi?tor Kalinchuk
Company/Institution: V.I. Il’ichev Pacific Oceanological Institute FEB RAS,
Session: Atmospheric Hg cycling: Source and Emissions
Co-Authors: Vi?tor Kalinchuk,Maxim Ivanov,Evgeniy Lopatnikov

Abstract Information :

Continuous underway measurements of atmospheric gaseous elemental mercury (GEM) and point measurements of sea-air GEM evasion fluxes were carried out in the marginal seas of northwestern Pacific from the South China Sea to the Okhotsk Sea during two adjacent cruises in autumn-winter 2019. The median GEM concentration was lower both the Northern Hemisphere background values and those previously recorded in these seas. A latitudinal gradient of GEM concentrations with a maximum at southern latitudes was found. The Yellow Sea with surrounding areas and northeast China were the source region of GEM for the Sea of Japan and the Sea of Okhotsk. The Kuril sector of the Pacific Ocean was also identified as a GEM source for the Sea of Okhotsk. East China, Southeast China, and Indo China were the GEM source areas for the East China Sea and South China Sea. Winter increases in GEM concentrations were observed in the Sea of Japan and the East China Sea, indicating the seasonal winter increase. Our data and analysis of published data showed significant relationships between GEM evasion fluxes, latitude and water temperature. We believe that on a global scale GEM gradient between water and atmosphere and sea surface temperature are the most significant parameters for sea-air GEM evasion fluxes. The study was supported by RSF (Project ? 19-77-10011).

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