Deep sea circulation of particulate organic carbon in the Japan Sea |
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| Authors: | Shigeyoshi Otosaka Takayuki Tanaka Orihiko Togawa Hikaru Amano Eugeny V Karasev Masayuki Minakawa Shinichiro Noriki |
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| Institution: | (1) Department of Geography, Queen’s University, 99 University Avenue, Kingston, ON, Canada, K7L 3N6;(2) Geology Department, Union College, 807 Union Street, Schenectady, NY 12308, USA |
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| Abstract: | Seasonal and spatial variations of particulate organic carbon (POC) flux were observed with sediment traps at three sites
in the Japan Sea (western and eastern Japan Basin and Yamato Basin). In order to investigate the transport processes of POC,
radiocarbon (14C) measurements were also carried out. Annual mean POC flux at 1 km depth was 30.7 mg m−2day−1 in the western Japan Basin, 12.0 mg m−2day−1 in the eastern Japan Basin and 23.8 mg m−2day−1 in the Yamato Basin. At all stations, notably higher POC flux was observed in spring (March–May), indicating biological production
and rapid sinking of POC in this season. Sinking POC in the high flux season showed modern Δ14C values (>0‰) and aged POC (Δ14C < −40‰) was observed in winter (December–January). The Δ14C values in sinking POC were negatively correlated with aluminum concentration, indicating that Δ14C is strongly related to the lateral supply of lithogenic materials. The Δ14C values also showed correlations with excess manganese (Mnxs) concentrations in sinking particles. The Δ14C-Mnxs relationship suggested that (1) the majority of the aged POC was advected by bottom currents and incorporated into sinking
particles, and (2) some of the aged POC might be supplied from the sea surface at the trap site as part of terrestrial POC.
From the difference in the Δ14C-Mnxs relationships between the Japan Basin and the Yamato Basin, we consider that basin-scale transport processes of POC occur
in the Japan Sea. |
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| Keywords: | Carbon cycle organic carbon Japan Sea lateral transport vertical transport radiocarbon accelerator mass spectrometry (AMS) sediment trap |
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