Distribution of (210)Po and export of organic carbon from the euphotic zone in the southwestern East Sea (Sea of Japan) SCIE SCOPUS

Cited 12 time in WEB OF SCIENCE Cited 17 time in Scopus
Title
Distribution of (210)Po and export of organic carbon from the euphotic zone in the southwestern East Sea (Sea of Japan)
Author(s)
Hong, Gj-Hoon; Kim, Young-Ill; Baskaran, Mark; Kim, Suk-Hyun; Chung, Chang-Soo
KIOST Author(s)
KIM, YOUNG-IL(김영일)Kim, Suk Hyun(김석현)Chung, Chang Soo(정창수)
Publication Year
2008-04
Abstract
The distribution of the natural radionuclide (210)Po in the water column along a horizontal transect of the continental shelf, slope and deep basin regions of the East Sea (Sea of Japan), a marginal sea of the Northwest Pacific Ocean, was investigated, and its behavior is described here. The settling fluxes of particulate (210)Po in the deep basin along with (210)Pb, (234)Th and biogenic matter were also determined. (210)Po inventories in the water column were observed to decrease from winter to summer in all stations, probably due to increased influx of (210)Po-poor Kuroshio Water of the Northwest Pacific Ocean during summer. Vertical profiles of dissolved and particulate (210)Po along with the settling fluxes of particulate (210)Po in the deep basin station have enabled us to evaluate temporal variations and residence times of (210)Po. In the slope and basin, activities of dissolved (210)Po generally decreased from the surface to the bottom water, with maximum activity just below the subsurface chlorophyll a maximum at 50-75 m depth in spring and summer. These subsurface peaks of dissolved (210)Po activity were attributed to the release of (210)Po from the decomposition of (210)Po-laden biogenic particulate organic matter. In the deep basin, despite the decrease in total mass flux, the sinking flux of particulate (210)Po was higher in the deeper trap (2000 m) than in the shallower one (1000 m), probably due to scavenging of dissolved (210)Po from the water column during particle descent and/or break-down of (210)Po-depleted particulate matter between 1,000 m and 2,000 m depths. In general, the ratios of the particulate phase to the dissolved phase of (210)Po (K(d)) increased with depth in the slope and basin stations. (210)Po removal from the water column appears to depend on the primary productivity in the upper waters. There is an inverse relationship between Kd and suspended particulate matter (SPM) concentration in the water column. From the (210)Po activity/chlorophyll a concentration ratios, it appears that sinking particles arriving at 1000 m depth were similar to those in the surface waters.
ISSN
0916-8370
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4525
DOI
10.1007/s10872-008-0022-4
Bibliographic Citation
JOURNAL OF OCEANOGRAPHY, v.64, no.2, pp.277 - 292, 2008
Publisher
SPRINGER
Subject
SUSPENDED PARTICULATE MATTER; SEASONAL-VARIATIONS; RESIDENCE TIMES; EXCESS PO-210; RA ISOTOPES; PB-210; PARTICLES; POLONIUM; WATER; RADIONUCLIDES
Keywords
Sea of Japan; dissolved and particulate (210)Po; sediment trap; scavenging
Type
Article
Language
English
Document Type
Article; Proceedings Paper
Publisher
SPRINGER
Related Researcher
Research Interests

marine pollution management,marine biogeochemistry,marine environmental radioactivity,해양오염관리,해양물질순환,해양환경방사능

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