Upwelling Enhances Mercury Particle Scavenging in the California Current Ecosystem

Upwelling Enhances Mercury Particle Scavenging in the California Current Ecosystem | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Upwelling Enhances Mercury Particle Scavenging in the California Current Ecosystem Xinyun Cui, Hannah M. Adams, Michael R. Stukel, Yiluan Song, Amina T. Schartup, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4102885/v2 This work is licensed under a CC BY 4.0 License Status: Posted Version 2 posted You are reading this latest preprint version Show more versions Abstract Coastal upwelling supplies nutrients supporting primary production, while also adding the toxic trace metal mercury (Hg), to the mixed layer of the ocean. This could be a concern for human and environmental health if it results in enhanced bioaccumulation of monomethylmercury (MMHg). Here we explore how upwelling influences the Hg cycling in the California Current Ecosystem (CCE) biome through particle scavenging and sea-air exchange. We collected suspended and sinking particle samples from an upwelled water parcel and a non-upwelled water parcel and observed higher total particulate Hg and sinking flux in the upwelling region compared to non-upwelling region. To further investigate the full dynamics of Hg cycling, we modeled Hg inventories and fluxes in the upper ocean under upwelling and non-upwelling scenarios. The model simulations confirmed and quantified that upwelling enhances sinking fluxes of Hg by 40% through elevated primary production. Such an enhanced sinking flux of Hg is biogeochemically important to understand in upwelling regions as it increases the delivery of Hg to the deep ocean where net conversion to MMHg may take place. Oceanography Hg cycling Biogeochemistry California Current Full Text Additional Declarations The authors declare no competing interests. Supplementary Files SupportingInformationFinal.docx Cite Share Download PDF Status: Posted Version 2 posted You are reading this latest preprint version Show more versions Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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