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Fate of dissolved black carbon in the deep Pacific Ocean

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Title: Fate of dissolved black carbon in the deep Pacific Ocean
Authors: Yamashita, Youhei Browse this author →KAKEN DB
Nakane, Motohiro Browse this author
Mori, Yutaro Browse this author
Nishioka, Jun Browse this author →KAKEN DB
Ogawa, Hiroshi Browse this author →KAKEN DB
Issue Date: 13-Jan-2022
Publisher: Nature Portfolio
Journal Title: Nature Communications
Volume: 13
Start Page: 307
Publisher DOI: 10.1038/s41467-022-27954-0
Abstract: Black carbon (BC), a byproduct of biomass and fossil fuel combustion, may impact the climate because it can be stored on Earth's surface for centuries to millennia. Dissolved BC (DBC) occurs ubiquitously in the ocean. However, the DBC cycle in the ocean has not been well constrained. Here, we show the basin-scale distribution of DBC in the Pacific Ocean and find that the DBC concentrations in the deep Pacific Ocean decrease along with deep-ocean meridional circulation. The DBC concentration is negatively correlated with apparent oxygen utilization, a proxy of the integrated flux of sinking particles, in the deep Pacific Ocean, implying that DBC is removed from the deep ocean to abyssal sediments through sorption onto sinking particles. The burial flux of BC to abyssal sediments is estimated to be 0.040-0.085 PgC yr(-1), corresponding to 1.5-3.3% of the anthropogenic CO2 uptake by the ocean.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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