Influence of atmospheric dust deposition on sinking particle flux in the northwest Pacific

Frontiers in Marine Science

Marine Science

Jong-Yeon Park¹  Sung Min An²  Joon Sang Park³  Ki-Young Choi⁴  Dongseon Kim⁴  Young-Gyu Park⁵  Jae Hoon Noh⁶  Jeomshik Hwang⁷  Hyung Jeek Kim⁸  Kyungman Kwon⁸ 

[1] Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju, Republic of Korea;Department of Microbial Resources, National Marine Biodiversity Institute of Korea, Seocheon, Republic of Korea;Library of Marine Samples, Korea Institute of Ocean Science & Technology, Geoje, Republic of Korea;Marine Environmental Research Department, Korea Institute of Ocean Science & Technology, Busan, Republic of Korea;Ocean Circulation and Climate Research Department, Korea Institute of Ocean Science & Technology, Busan, Republic of Korea;Ocean Climate Response & Ecosystem Research Department, Korea Institute of Ocean Science & Technology, Busan, Republic of Korea;School of Earth and Environmental Sciences/Research Institute of Oceanography, Seoul National University, Seoul, Republic of Korea;Tropical & Subtropical Research Center, Korea Institute of Ocean Science & Technology, Jeju, Republic of Korea;

关键词: sediment trap;    particle flux;    POC flux;    dust deposition;    biological pump;    northwest Pacific;   

DOI  :  10.3389/fmars.2023.1180480

 received in 2023-03-06, accepted in 2023-09-04,  发布年份 2023

来源: Frontiers

【 摘 要 】

We examined the flux and composition of sinking particles collected at a water depth of 800 m in the northwest Pacific from November 2017 to August 2018 to assess the impact of dust deposition on organic carbon export. The fluxes of total particulate matter and particulate organic carbon averaged over the study period were 88 ± 63 mg m-2 d-1 and 9.0 ± 5.8 mg m−2 d−1, respectively. Biogenic particles accounted for 82% of the sinking particles, on average. There were two notable pulses in the particle fluxes of both biogenic and lithogenic material in February and May 2018. These flux peaks were decoupled from net primary production in the surface waters but coincided with intervals of high rates of atmospheric dust deposition. The biogenic component of the two peaks was dominated by two different phytoplankton communities, which may have influenced carbon export efficiency. Correlations between the sinking particle flux and the lithogenic flux are found at several locations in the northwest Pacific, implying that East Asian dust deposition has a prevalent influence on the biological pump. Attention should be paid to the effects of changes in the continental dust supply to the oceans on oceanic carbon export.

【 授权许可】

Unknown   
Copyright © 2023 Kim, Kim, Park, Park, Choi, Park, An, Kwon, Noh and Hwang