Abstract
Concentration profiles of Pb-210, Po-210 were measured on several KEEP (Kuroshio Edge Exchange Process) program stations. Results of both Pb-210 and Po-210 of surface water along B transect (from station 6115 to station 4531) showed an increasing trend toward deeper water. This reflected the more efficient removal of Pb-210, Po-210 from the shelf water. Vertical profiles of deep water station (i.e. 4531, 5131) did show Po-210 deficiencies, Po-210/Pb-210＜1, at upper layer (＜100m); and Po-210 excess in the middle layer (200m-500m). With Box Model calculation, the recycling efficiency of Pb-210 and Po-210 in the middle laycr is found to bc 2.9% and 85.4%. Vcrtical profilc of the near shelf-break station 512Am where upwelling of intrusion of Kuroshio water occurred, showed the feature of richness in Po-210. the profile of the station 5323, located at a very steep upper slope region, showed the feature of Pb-210 excess all over the water column. Some sediment particles shich contains excess Pb-210 might re-export from the outer shelf to slope water. The shelf water station was characterized with Po-210 excess in most of the water column except the very top layer (＜20m).
Highlights
Pb-210 and Po-210 are members.of the naturally-occurring uranium decay series
Pb-210 is strongly depleted relative to Ra-226 by bottom and boundary scavenging processes (Bacon et al, 1976; Nozaki et al Spencer et al, 1981; Cochran et al, 1983)
This paper presents our effort to study the partition of Pb-210 and Po-210 between the dissolved and particulate phases in KEEP area
Summary
Pb-210 and Po-210 are members.of the naturally-occurring uranium decay series. Both of them are highly reactive and tend to associate with particulate phases. The Kuroshio, a conduit linking the East China Sea to the Pacific Ocean proper, flows northward in the areas just off northeast Taiwan. A shelf-slope circulation pattern with lateral water movement is generated to result in a major exchange between the East China Sea and the Kuroshio. Sometimes the Kuroshio intrudes onto the shelf of the East China Sea, having a major effect on the composition of the shelf waters. The large concentration gradient of Pb-210 across the frontal region dividing the slope water from the shelf water at south of New England was observed by Bacon (Bacon et al, 1988) This phenomenon implies the continental shelf may be an important sink of Pb-210 from the open ocean. The determination of residence time, scavenging rate and recycling efficiencies of Pb-210 and Po-210 are the major focuses of this study
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