동해 울릉분지에서의 유기탄소 순환

Title
동해 울릉분지에서의 유기탄소 순환
Alternative Title
The cycling of organic carbon at the Ulleung Basin sediments, the East/Japan Sea
Author(s)
이태희; 김동선
KIOST Author(s)
Lee, Tae Hee(이태희)Kim, Dong Seon(김동선)
Publication Year
2006-10-13
Abstract
The cycling of organic carbon fluxes was investigated based on a chamber experiment, porewater and geochemical analyses at the Ulleung Basin sediments in the 2005 summer. Sediment samples were collected using a box corer at the southern slope (B4), the western slope (D1), and the basin (D2 and D4). The burial flux of organic carbon was calculated by multiplying the sediment accumulation rate (SAR) and organic carbon contents. The recycling flux of organic carbon was estimated from the oxygen consumption rate (OCR) by applying a organic carbon: O2 ratio of 106/138. Assuming the steady-state at the Ulleung Basin sediments, input flux of organic carbon is equal to the sum of burial flux and recycling flux. Burial fluxes of organic carbon ranged from 2.4 to 8.3 gC m-2 yr-1 with the highest value at station D1 and the lowest at station D4. OCR measured by the oxygen microelectrode were 6.88, 8.58, 5.27, and 5.48 mmolO2 m-2 d-1 at station B4, D1, D2, and D4, respectively. On the other hand, OCR measured at station D2 by a chamber experiment was 2.1 mmolO2 m-2 d-1, which was less than an half of that measured by the oxygen microelectrode. Recycling fluxes of organic carbon estimated from the OCR measurements by the oxygen microelectrode varied from 15.9 to 25.9 gC m-2 yr-1. Input fluxes of organic carbon were calculated to be 27.6, 35.5, 18.4, 18.9 gC m-2 yr-1 at station B4, D1, D2, and D4, respectively. About 4~9% of the primary production in the surface waters is deposited in the Ulleung Basin sediments. About 80% of organic carbon deposited in the Ulleung Basin sediments is regenerated in the sediment column, and about 20% is permanently buried in the sediments. The Ulleung Basin may play an important role for the deposition and/or removal of organic carbon
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30869
Bibliographic Citation
PICES 15th annual meeting, pp.27, 2006
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
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