Variable aging and storage of dissolved black carbon in the ocean.

ABSTRACT: During wildfires and fossil fuel combustion, biomass is converted to black carbon (BC) via incomplete combustion. BC enters the ocean by rivers and atmospheric deposition contributing to the marine dissolved organic carbon (DOC) pool. The fate of BC is considered to reside in the marine DOC pool, where the oldest BC ¹⁴C ages have been measured (>20,000 ¹⁴C y), implying long-term storage. DOC is the largest exchangeable pool of organic carbon in the oceans, yet most DOC (>80%) remains molecularly uncharacterized. Here, we report ¹⁴C measurements on size-fractionated dissolved BC (DBC) obtained using benzene polycarboxylic acids as molecular tracers to constrain the sources and cycling of DBC and its contributions to refractory DOC (RDOC) in a site in the Nor

SUBMITTER: Coppola AI 

PROVIDER: S-EPMC10990100 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature