NDLI: Particulate organic carbon export flux by $^{234}$Th/$^{238}$U disequilibrium in the continental slope of the East China Sea

Content Provider	Springer Nature Link
Author	Bi, Qianqian Du, Jinzhou Wu, Ying Zhou, Jing Zhang, Jing
Copyright Year	2013
Abstract	$^{234}$Th is widely used to quantify the magnitude of upper ocean particulate organic carbon (POC) export in oceans. In the present work, the rates of particulate organic carbon export were measured based on the distribution patterns of $^{234}$Th/$^{238}$U disequilibrium in the water column within the continental slope of the East China Sea (ECS) during May 2011. The profiles of particulate and dissolved $^{234}$Th activities at all three stations showed a relative deficit with respect to $^{238}$U in the upper 100m of the water column. The dissolved $^{234}$Th scavenging rates and the particulate $^{234}$Th removal rates and their residence times were calculated by a one-dimensional steady state model. The results showed that the dissolved $^{234}$Th scavenging rates and the particulate $^{234}$Th removal rates ranged from 12.4–61.4 dpm/(m$^{3}$·d) and from 3.8–21.8 dpm/(m$^{3}$·d), respectively. The residence times of dissolved and particulate $^{234}$Th were in the range of 3.4–158 d and 63.7–96.5 d, respectively. Combined with the measurement of POC/$^{234}$Th ratios of suspended particles, POC export flux (calculated by carbon) from the euphotic zone was estimated in the study region, which ranged from 4.14–14.7 mmol/(m$^{2}$·d),with an average of 8.21 mmol/(m$^{2}$·d), occupying 35% of the prime productivity in the study area. The results of this study can provide new information for better understanding the carbon biogeochemical cycle within the continental slope of the ECS.
Starting Page	67
Ending Page	73
Page Count	7
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	32
Issue Number	10
e-ISSN	18691099
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-10-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	$^{234}$Th/$^{238}$U disequilibrium residence time POC export East China Sea (ECS) Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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